Pikachu Nudibranch Sea Slug (Thecacera pacifica Bergh, 1883)

Presence of the Pikachu Nudibranch Sea Slug (Thecacera pacifica Bergh, 1883) in the Dibba Sea, Gulf of Oman, Arabian Sea, Indian Ocean

تواجد بُزاق البحر بيكاتشو عاري الخياشيم ( ثكاسّرا باسيفيكا ) في بحر دِبا ، خليج عُمان ، بحر العرب ، المُحيط الهندي

By : Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa Khalaf-Sakerfalke von Jaffa & Ola Mostafa Esmail Mostafa Khalaf

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (Photography) (2018). Presence of the Pikachu Nudibranch Sea Slug (Thecacera pacifica Bergh, 1883) in the Dibba Sea, Gulf of Oman, Arabian Sea, Indian Ocean. تواجد بُزاق البحر بيكاتشو عاري الخياشيم في بحر دِبا ، خليج عُمان ، بحر العرب ، المُحيط الهِندي . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 163, July 2018, pp. 1-21. Dubai and Sharjah, United Arab Emirates. (In Arabic & English). http://nudibranch.webs.com/thecacera-pacifica

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. 26.06.2017

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Reef Blocks site in Dibba Sea, Gulf of Oman, Photo by PADI Dive Instructor Ola Mostafa Khalaf. 26.06.2017 https://www.facebook.com/photo.php?fbid=1925639587689417&set=a.1408184479434933.1073741829.100007301827082&type=3&theater & http://nudibranch.webs.com/nudibranch-uae-1 & http://nudibranch.webs.com/thecacera-pacifica

On Monday 26.06.2017, PADI Dive Instructor Ola Mostafa Khalaf managed to shoot magnificent photos of the Pikachu Nudibranch Sea Slug (Thecacera pacifica Bergh, 1883), 19 meters deep, from the Reef Blocks site in Dibba Sea, East Coast of the United Arab Emirates, Gulf of Oman, Arabian Sea, Indian Ocean.

بتوفيق من الله سُبحانه تعالى تمكنت مُدربة الغواصين العالمية الكابتن عُلا مُصطفى خلف من تصوير بُزاق البحر بيكاتشو عاري الخياشيم ( ثّكاسّرا باسيفيكا) في موقع الكُتل الشعابية على عُمق 19 متراً في بحر دِبا على الساحل الشرقي لدولة الإمارات العربية المُتحدة ، خليج عُمان ، بحر العرب ، المُحيط الهندي ... والحمدُ لله رب العالمين ... 26.06.2017

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. تم نشر هذه الصورة في مجلة ناشيونال جيوغرافيك العربية ، عدد أغسطس 2017 ، الصفحة 85-86 

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Dibba Sea. Photo by PADI Dive Instructor Ola Mostafa Khalaf. This photo was published in National Geographic AlArabiya, August 2017, page 85-86. https://www.facebook.com/NatGeoAlArabiya/photos/a.142775492442887.41470.138929842827452/1397473193639771/?type=3&theater

ينتمي بُزاق البحر بيكاتشو عاري الخياشيم ذو الإسم العِلمي " ثّكاسّرا باسيفيكا " إلى عائلة " بولايسّريدي " وهي من عائلات الحيوانات الرخوية البطنقدمية البحرية . ويصل طوله إلى 3 سنتيمترات ؛ وهو يمتاز بلون جسمه البُرتقالي الشبه شفاف مع وجود أشرطة لونية سوداء ؛ وتكون نهايات القرون الحِسية والخياشيم سوداء اللون ، وحافة غمد القرون الحِسية ذات لونين أسود وأزرق "كهربائي" ؛ ويتواجد اللون الأزرق "الكهربائي" عند نهاية الذيل ، وكذلك نهايات الحُليمات الجانبية بجانب الخياشيم . وقد سُمي بزاق البحر بيكاتشو بهذا الإسم لتشابههِ بشخصية بيكاتشو ، وهي من شخصيات الرُسوم المُتحركة بوكيمون 

ويعيش بُزاق البحر بيكاشو في المحيطات الهندي والأطلسي وجنوب المحيط الهادي . وهو يعيش في خليج عُمان قُبالة السواحل الشرقية لدولة الإمارات العربية المتحدة 

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. 26.06.2017

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Reef Blocks site in Dibba Sea, Gulf of Oman, Photo by PADI Dive Instructor Ola Mostafa Khalaf. 26.06.2017. http://nudibranch.webs.com/thecacera-pacifica

Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: ANADORIDOIDEA
Family: Polyceridae
Subfamily: Polycerinae (Rudman, 2002)

Thecacera pacifica is a species of sea slug, a nudibranch, a marine gastropod mollusk in the family Polyceridae. It is sometimes also nicknamed Pikachu Nudibranch due to its resemblance to the Pokémon character Pikachu (Wikipedia).

This species is known from the African coast of the Indian Ocean (Mozambique) to Indonesia and Vanuatu. It has also been reported from the Gulf of Mexico, Atlantic Ocean (Wikipedia).


This polycerid nudibranch is translucent orange in colour with black tips to the rhinophores and gills. The rhinophore sheaths are edged with black with a patch of blue at the widest part. This blue colour is also present at the tip of the tail and at the tip of the lateral papillae beside the gills, separated from the orange of the body by a black band. Some specimens have black linear marks on the body with blue centres (Wikipedia).


Thecacera pacifica is characterized by its orange body, its extrabranchial processes, extrarhinophoral processes and the 'tail' are white tipped diffusing into blue then into a black band. The rhinophores are orange with a black apex, the gills have a black line along the outside (Köhler, 2017).
Pretty similar is Thecacera sp. 01 which has black spots on the body and black tipped extrabranchial processes (Köhler, 2017).

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. 26.06.2017

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Reef Blocks site in Dibba Sea, Gulf of Oman, Photo by PADI Dive Instructor Ola Mostafa Khalaf. 26.06.2017. http://nudibranch.webs.com/thecacera-pacifica

Maximum Size:  20-30 mm.

Identification:  This is a translucent-orange animal decorated with black bands shading into electric-blue and white (Pittman & Fiene).

Natural History (Hawaii):  On Maui in Hawaii, Thecacera pacifica is known from only a few animals found along the leeward coast at 8-18 m (25-60 ft). Some were crawling on sand, others on debris or Halimeda kanaloana. It has also been found in a moderately protected rocky habitat on the Kona coast of the Big Island at 3-6 m (10-20 ft) (Pittman & Fiene).


Distribution: The Pikachu Nudibranch is known from the Indian Ocean, Atlantic Ocean and the South Pacific Ocean. It lives in the Gulf of Oman, off the Eastern Coast of the United Arab Emirates.

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. 26.06.2017

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Reef Blocks site in Dibba Sea, Gulf of Oman, Photo by PADI Dive Instructor Ola Mostafa Khalaf. 26.06.2017. http://nudibranch.webs.com/thecacera-pacifica

References and Internet Websites

Al Mehairi, Captain Abdulla (Instagram: Nudibranchhunter). (12 March 2017). : Ola Khalaf’s Nudibranch (Diaphorodoris olakhalafi Khalaf, 2017). https://www.instagram.com/p/BRhoE0agu5V/ 

Arora, Michael (16.12.2005). Chromodoris annulata ? from Bahrain. Sea Slug Forum. http://www.seaslugforum.net/message/15481 

Baba, K. (1949). Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. 194 pp., 50 pls. Iwanami Shoten, Tokyo. 

Barry, Melinda (06.06.2002). Chromodoris annulata from United Arab Emirates. Sea Slug Forum. http://www.seaslugforum.net/message/7162

Behrens, D.W. (2000, December 21) Hypselodoris dollfusi (Pruvot-Fol, 1933). [In] Sea Slug Forum. Australian Museum, Sydney. http://www.seaslugforum.net/showall/hypsdoll 
Behrens, D.W. (2000, Dec 23) Rediscovery of Hypselodoris dollfusi. [Message in] Sea Slug Forum. Australian Museum, Sydney. 
Bergh R. (1883). Beiträge zu einer Monographie der Polyceraden. Verhandlungen der Koniglich-kaiserlich Zoologische-botanischen Gesellschaft in Wien (Abhundlungen) 33: 135-180, plates 6-10. 
Bertsch, H. & A. Kerstitch (1984). Distribution and radular morphology of various nudibranchs (Gastropoda: Opisthobranchia) from the Gulf of California, Mexico. The Veliger, 26: 264-273. 
Bouchet, P. (2010). Thecacera pacifica (Bergh, 1884). In: MolluscaBase (2017). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=420618 
Bouchet, P. (2012). Goniobranchus obsoletus. Accessed through: World Register of Marine Species on 2012-05-07. 
Bouchet, P. (2012). Hypselodoris pulchella. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=597870 on 2012-06-09 
Bouchet, P. (2015). Dermatobranchus semistriatus. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-09-30. 
Bouchet, P. (2015). Onchidorididae Gray, 1827. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=175  
Bouchet, P. (2017). Diaphorodoris olakhalafi Khalaf, 2017. In: MolluscaBase (2017). Accessed through: World Register of Marine Species at http://marinespecies.org/aphia.php?p=taxdetails&id=1023241 
Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1-397. ISBN 3925919724. ISSN 0076-2997. 
Calado, R., Vitorino, A., Dionisio, G. and Dinis, M.T. (2006). A recirculated maturation system for marine ornamental decapods. Aquaculture. 263: 68-74. 
Debelius, H. & Kuiter, R.H. (2007). Nudibranchs of the world. ConchBooks, Frankfurt, 360 pp. ISBN 978-3-939767-06-0
Endemia. Dermatobranchus semistriatus (Baba, 1949). http://endemia.nc/faune/fiche6890.html 
Gastropods.com. Dermatobranchus semistriatus. http://www.gastropods.com/7/Shell_54307.shtml 
Gastropods. Hypselodoris pulchella. http://www.gastropods.com/5/Shell_50595.shtml 
Gbif. Hypselodoris pulchella (Rüppell & Leuckart, 1828). www.gbif.org/species/6788165 
Gohar, H. A. F., & I. A. Aboul-Ela (1957). The development of three chromodorids (with the description of a new species). Publications of the Marine Biological Station, Al-Ghardaqa, Egypt, 9: 203-228, pls. 1-5. 
Gosliner, T.M. & Behrens, D.W. (2000) Two new species of Chromodorididae (Mollusca: Nudibranchia) from the tropical Indo-Pacific, with a redescription of Hypselodoris dollfusi (Pruvot-Fol, 1933). Proceedings of the California Academy of Sciences,(4) 52(10): 111-124, 7 figs. 
Gosliner, T.M., Behrens, D.W. & Valdes, A. (2008) Indo-Pacific Nudibranchs and seaslugs. A field guide to the world's most diverse fauna. Sea Challengers Natural History Books, Washington, 426 pp. 
Goslinger, Terrence M. & Shireen J. Fahey (2011). Previously undocumented diversity and abundance of cryptic species: a phylogenetic analysis of Indo-Pacific Arminidae Rafinesque, 1814 (Mollusca: Nudibranchia) with descriptions of 20 new species of Dermatobranchus. Zoological Journal of the Linnean Society 161: 245–356. http://onlinelibrary.wiley.com/doi/10.1111/j.1096-3642.2010.00649.x/full 
Gosliner, Terrence M., Angel Valdes & David W. Behrens (2015) Nudibranch and Sea Slug Identification: Indo-Pacific. New World Publications Inc., U.S., United States. 2248 photos, 408 pages. ISBN: 9781878348593
Hallas J. M. & Gosliner T. M. (2015). Family matters: The first molecular phylogeny of the Onchidorididae Gray, 1827 (Mollusca, Gastropoda, Nudibranchia). Molecular Phylogenetics and Evolution 88: 16-27. doi:10.1016/j.ympev.2015.03.015
Houben, Anouk (September 28, 2007). Chromodoris hintuanensis from Sri Lanka. Sea Slug Forum. http://www.seaslugforum.net/message/20838
Inskip and Gillett. 2005. Checklist of CITES Species and Annotated CITES Appendices and Reservations. Available at: http://www.cites.org/common/resources/2005_CITES_Checklist.pdf. 
Jeffords, Jeffrey. (2005). Jeff’s Nudibranch Site and Coral Reef Gallery. Available at: http://www.divegallery.com/shrimp_ambonian.htm. 
Johnson, Rebecca Fay & Terrence M. Gosliner (2012). Traditional Taxonomic Groupings Mask Evolutionary History: A Molecular Phylogeny and New Classification of the Chromodorid Nudibranchs.  
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0033479

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. 26.06.2017

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Reef Blocks site in Dibba Sea, Gulf of Oman, Photo by PADI Dive Instructor Ola Mostafa Khalaf. 26.06.2017. http://nudibranch.webs.com/thecacera-pacifica

Khalaf, Norman Ali Bassam (1980). Tabie’t Al-Talawon fi Al-Haywanat (The Colouration of Animals). Al-Biology Bulletin. Number 1. January 1980, Safar 1401. Biological Society, Kuwait University, State of Kuwait. pp. 4-5. (In Arabic). 

Khalaf, Norman (Translator) (1982). Al-Miah Al-Mulawatha Tohaded Al-Asmak Bi’ilinqiraad (Water Pollution threatens the Fish Fauna with Extinction). Al-Biology Bulletin. Number 18, Third Year, First Semester, Saturday 6.11.1982. Biological Society, Kuwait University, State of Kuwait. pp. 7. (Translation from German into Arabic). 

Khalaf, N.A.B. (1986). The Schooling of Sumatra Barbs (Barbus tetrazona tetrazona) and Minnows (Phoxinus phoxinus). Dissertation, Master of Science in Ecology, Departments of Zoology and Botany, University of Durham, England. September 1986. pps. 59 + iv. 

Khalaf-von Jaffa, Norman Ali Bassam (1992). An Introduction to the Animal Life in Palestine. Gazelle. Gazelle: The Palestinian Biological Bulletin. Bonn-Bad Godesberg, Federal Republic of Germany. Number 30, Tenth Year, October 1992. pp. 1-7. (In Arabic).
Khalaf-von Jaffa, Norman Ali Bassam (1994). An Introduction to the Animal Life in Palestine. Shqae’q Al-Nouma’n (Anemone coronaria). A Quarterly Magazine Issued by the Program EAI (Education for Awareness and for Involvement). Environmental Education / Children for Nature Protection. In Cooperation with Dept. of General and Higher Education. P.L.O., Palestine. Number 4. Huzairan (June) 1994. pp. 16-21. (In Arabic). 

Khalaf, Norman Ali Bassam (2001). The Extinct and Endangered Animals in Palestine. In: Gazelle: The Palestinian Biological Bulletin Home Page. Extinct and Endangered Animals and Reintroduction. http://gazelle.8m.net/photo3.html 

Khalaf, Norman Ali Bassam (2001). The Extinct and Endangered Animals in Palestine. In: Gazelle: The Palestinian Biological Bulletin Home Page. Extinct and Endangered Animals and Reintroduction. http://gazelle.8m.net/photo3.html 

Khalaf-von Jaffa, Norman Ali (2004). Gazelle: Das Palästinensische Biologische Bulletin. Eine Wissenschaftliche Reise in Palästina, Arabien und Europa zwischen 1983 – 2004. / Gazelle: The Palestinian Biological Bulletin. A Scientific Journey in Palestine, Arabia and Europe between 1983 – 2004. ISBN 3-00-014121-9. Erste Auflage / First Edition, Juli 2004: 452 Seiten / Pages. Zweite erweiterte Auflage (Second Extended Edition), August 2004: 460 Seiten / Pages. Norman Ali Khalaf, Bonn-Bad Godesberg, Germany. http://dr-norman-ali-khalaf-books.webs.com/ 

Khalaf-von Jaffa, Norman Ali (2005). Aquatica Arabica. An Aquatic Scientific Journey in Palestine, Arabia and Europe between 1980 - 2005 / Aquatica Arabica. Eine Aquatische Wissenschaftliche Reise in Palästina, Arabien und Europa zwischen 1980 - 2005. ISBN 3-00-014835-3. Erste Auflage / First Edition, August 2005: 376 Seiten / Pages. Norman Ali Khalaf, Rilchingen-Hanweiler, Bundesrepublik Deutschland & Sharjah, United Arab Emirates. http://dr-norman-ali-khalaf-books.webs.com/aquaticaarabica.htm 

Khalaf, N.A.B. (2005). The Schooling of Sumatra Barbs (Barbus tetrazona tetrazona) and Minnows (Phoxinus phoxinus). [M.Sc. Dissertation in Ecology, Departments of Zoology and Botany, University of Durham, England. September 1986. pps. 59 + iv]. In: Aquatica Arabica. An Aquatic Scientific Journey in Palestine, Arabia and Europe between 1980 - 2005. Erste Auflage, August 2005. Norman Ali Khalaf, Rilchingen-Hanweiler, Bundesrepublik Deutschland & Sharjah, United Arab Emirates. pp. 28-93. 

Khalaf-von Jaffa, Norman Ali Bassam (Member of PALESTA) (2005). Palestinian Scientists and Technologists Abroad (PALESTA). Gazelle: The Palestinian Biological Bulletin. Number 47, Twenty-third Year, November 2005, Shawal 1426. pp. 11-12. Sharjah, United Arab Emirates. (In Arabic). 

Khalaf, Norman Ali (2005, 2006, 2007). Chapter 3: Geography, Flora and Fauna. Pages 32-39. In: Palestine: A Guide. By Mariam Shahin, Photography by George Azar. Co-Author: Norman Ali Khalaf. Northampton, Massachusetts: Interlink Publishing Group, 2005, 2006, 2007. xi + 471 pages. Appendices to page 500. http://ipsnewsite.mysite4now.com/journals.aspx?id=7323&jid=1&href=fulltext 

Khalaf-Sakerfalke von Jaffa, Norman Ali Bassam Ali Taher (Gründer) (seit Juni 2007). Yahoo! Deutschland Group: Fauna Palaestina. http://de.groups.yahoo.com/group/Fauna_Palaestina/

Khalaf-Sakerfalke von Jaffa, Norman Ali Bassam Ali Taher (2007). Felidae Arabica. A Zoological Journey in Palestine, Arabia and Europe between 1980-2007 / Felidae Arabica. Eine Zoologische Reise in Palästina, Arabien und Europa zwischen 1980-2007. ISBN 978-3-00-019568-6. Erste Auflage (First Edition), Juli (July) 2007, 300 pp. Norman Ali Khalaf, Rilchingen-Hanweiler, Deutschland & Sharjah, United Arab Emirates. (in Arabic, German and English). Doctoral Dissertation. Ashwood University, USA. Doctor of Science Degree in Zoology (Summa Cumm Laude) on 26.09.2007. http://dr-norman-ali-khalaf-books.webs.com/felidaearabica.htm & Doctorate Dissertation : https://www.yumpu.com/en/document/view/59397999/doctorate-dissertation-felidae-arabica-by-norman-ali-bassam-khalaf-doctor-of-science-ashwood-university-usa-2007 

Khalaf-Sakerfalke von Jaffa, Norman Ali Bassam Ali Taher (Gründer) (seit September 2007). Yahoo! Deutschland Group: Fauna Arabica. http://de.groups.yahoo.com/group/Fauna_Arabica/ 

Khalaf-Sakerfalke von Jaffa, Norman Ali Bassam Ali Taher (2007). Haywanat Filistin حيوانات فلسطين (Fauna of Palestine). Wikipedia, Al-Mawsu'a Al-Hurra (The Free Encyclopedia). Gazelle: The Palestinian Biological Bulletin. Number 69, Twenty-fifth Year, September 2007 CE, Sha’ban 1428 AH. pp. 1-4. (in Arabic). http://ar.wikipedia.org/wiki/%D8%AD%D9%8A%D9%88%D8%A7%D9%86%D8%A7%D8%AA_%D9%81%D9%84%D8%B3%D8%B7%D9%8A%D9%86 

Khalaf-Sakerfalke von Jaffa, Dr. Sc. Norman Ali Bassam Ali Taher (2009). Flora and Fauna in Palestine. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 91, July 2009, Rajab 1430 AH. pp. 1-31. Sharjah, United Arab Emirates. http://flora-fauna-palestine.webs.com/ 

Khalaf-von Jaffa, Dr. Norman Ali Bassam (2009). Fauna Palaestina – Part One. A Zoological Journey in Palestine, Arabia and Europe between 1983 – 2006 / Fauna Palaestina – Teil Eins. Eine Zoologische Reise in Palästina, Arabien und Europa zwischen 1983 – 2006. ISBN 978-9948-03-865-8. Erste Auflage/First Edition, September 2009: 412 Seiten/Pages. Self Publisher: Dr. Norman Ali Bassam Khalaf-von Jaffa, Sharjah, United Arab Emirates & Rilchingen-Hanweiler, Bundesrepublik Deutschland. http://dr-norman-ali-khalaf-books.webs.com/faunapalaestinapart1.htm 

Dr. Sc. Norman Ali Bassam Ali Taher Khalaf-Sakerfalke von Jaffa, Zoologist, Ecologist and Geologist : The Scientific References (1980-2009). http://dr-norman-ali-khalaf-references.webs.com/ 

Khalaf-von Jaffa, Dr. Sc. Norman Ali Bassam Ali Taher (2010). Fauna Emiratus - Part One. Zoological Studies in the United Arab Emirates between 2004 - 2009. / Fauna Emiratus – Teil Eins. Zoologische Studien in die Vereinigten Arabischen Emirate zwischen 2004 - 2009. ISBN 978-9948-15-462-4. Erste Auflage/First Edition, November 2010: 350 Seiten / Pages. Self Publisher: Dr. Norman Ali Bassam Khalaf-von Jaffa, Dubai and Sharjah, United Arab Emirates & Rilchingen-Hanweiler, Bundesrepublik Deutschland.
http://dr-norman-ali-khalaf-books.webs.com/faunaemiratuspart1.htm 

Khalaf-von Jaffa, Dr. Norman Ali Bassam (2012). Fauna Palaestina – Part Two. Zoological Studies in Palestine between 1983 – 2009 / Fauna Palaestina - Teil Zwei. Zoologische Studien in Palästina zwischen 1983 – 2009. ISBN 978-9948-16-667-2. 1. Auflage / First Edition : July 2012, Shaaban 1433 H. 208 Seiten / Pages (Arabic Part 120 Pages and the English Part 88 Pages). Publisher: Dar Al Jundi Publishing House, Jerusalem, Palestine. http://dr-norman-ali-khalaf-books.webs.com/faunapalaestinapart2.htm 

Khalaf-von Jaffa, Dr. Norman Ali Bassam (2013). Fauna Palaestina – Part Three. Zoological Studies in Palestine between 2005 – 2012 / Fauna Palaestina - Teil Drei. Zoologische Studien in Palästina zwischen 2005 – 2012. ISBN 978-9950-383-35-7. Erste Auflage / First Edition : July 2013, Shaaban 1434 H. 364 pages (English Part 350 Pages and the Arabic Part 14 Pages). Publisher: Dar Al Jundi Publishing House, Jerusalem, State of Palestine. http://dr-norman-ali-khalaf-books.webs.com/faunapalaestinapart3.htm 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher (2013). Garra rufa wadiqana Khalaf, 2013: A New Freshwater Doctor Fish Subspecies from Wadi Qana Nature Reserve, Salfit Governorate, State of Palestine. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 103, July 2013, Ramadan 1434 AH. pp. 1-25. Dubai and Sharjah, United Arab Emirates. http://palestine-fishes.webs.com/palestine-doctor-fish

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher (2013). † Macropomoides palaestina Khalaf, 2013 : A New Coelacanth Fish Fossil Species from the Anthracothere Hill in Al-Naqab, Palestine. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 107, November 2013, Muharram 1435 AH. pp. 30-38. Dubai and Sharjah, United Arab Emirates. http://quastenflosser.webs.com/macropomoidespalaestina.htm 

Khalaf-von Jaffa, Prof. Dr. Norman Ali Bassam (2014). Fauna Palaestina – Part Four. Zoological Studies in Palestine between 1983 – 2014 / Fauna Palaestina - Teil Vier. Zoologische Studien in Palästina zwischen 1983 – 2014. ISBN 978-9950-383-77-7. Erste Auflage / First Edition : July 2014, Ramadan 1435 H. 456 Pages (English Part 378 Pages and the Arabic Part 78 Pages). Publisher: Dar Al Jundi Publishing House, Al-Quds (Jerusalem), State of Palestine. http://fauna-palaestina-part-1.webs.com/faunapalaestina4.htm 

Khalaf-von Jaffa, Prof. Dr. Norman Ali Bassam (2014). † Macropomoides palaestina Khalaf, 2013 : A New Coelacanth Fish Fossil Species from the Anthracothere Hill in Al-Naqab, Palestine. In: Fauna Palaestina – Part Four. Zoological Studies in Palestine between 1983 – 2014 / Fauna Palaestina - Teil Vier. Zoologische Studien in Palästina zwischen 1983 – 2014. ISBN 978-9950-383-77-7. Erste Auflage / First Edition : July 2014, Ramadan 1435 H. pp. 126 - 138. Publisher: Dar Al Jundi Publishing House, Al-Quds (Jerusalem), State of Palestine. 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Norman Ali Bassam Ali Taher (2015). Plants and Animals unique to Palestine. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 125, May 2015. pp. 1-18. Dubai and Sharjah, United Arab Emirates. http://flora-fauna-palestine-2.webs.com/

Khalaf-von Jaffa, Prof. Dr. Norman Ali Bassam (2015). Fauna Palaestina – Part Five. Zoological Studies in Palestine between 1983 – 2016 / Fauna Palaestina - Teil Fünf. Zoologische Studien in Palästina zwischen 1983 – 2016. ISBN 978-9950-383-92-0. Erste Auflage / First Edition : July 2015, Ramadan 1436 H. 448 pp. (English Part 304 Pages and the Arabic Part 144 Pages). Publisher: Dar Al Jundi Publishing House, Al-Quds (Jerusalem), State of Palestine. http://fauna-palaestina-books.webs.com/ 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher (2016). Haywanat Falastin (Fauna of Palestine) حيوانات فلسطين . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 144, December 2016, pp. 1-18. Dubai and Sharjah, United Arab Emirates (In Arabic). http://animals-of-palestine-2.webs.com/fauna-of-palestine-arabic 

Khalaf, Norman Ali (29.03.2017). Nudibranch Dermatobranchus semistriatus. Facebook. https://www.facebook.com/media/set/?set=a.10155064934059831&type=1&l=0c20d27dc7 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (2017). Diaphorodoris olakhalafi Khalaf, 2017 : A New Dorid Nudibranch Sea Slug Species from the Sea of Khorfakkan, Gulf of Oman, Arab Sea, Indian Ocean. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 149, May 2017, pp. 31-47. Dubai and Sharjah, United Arab Emirates. http://marine-life-uae.webs.com/diaphorodoris-olakhalafi & https://issuu.com/dr-normanalibassamkhalaf/docs/nudibranch_ola_khalaf & https://newsstand.joomag.com/en/gazelle-the-palestinian-biological-bulletin-issn-0178-6288-number-149-may-2017-pp-31-47/0798719001494476364 

Khalaf-von Jaffa, Prof. Dr. Norman Ali Bassam (May 2017). Ola Khalaf’s Nudibranch (Diaphorodoris olakhalafi Khalaf, 2017). EOL: Encyclopedia of Life. http://eol.org/collections/131000 

Khalaf-von Jaffa, Prof. Dr. Norman Ali Bassam (May 2017). Taxon Profile: Species Khorfakkan White Dorid Nudibranch Diaphorodoris olakhalafi Khalaf, 2017. BioLib.cz. Biological Library Classification. http://www.biolib.cz/en/taxon/id1222805/ 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa (August 2017). Pikachu Nudibranch Sea Slug. بزاق البحر بيكاشو عاري الخياشيم. Wikipedia (In Arabic). https://ar.wikipedia.org/wiki/%D8%A8%D8%B2%D8%A7%D9%82_%D8%A7%D9%84%D8%A8%D8%AD%D8%B1_%D8%A8%D9%8A%D9%83%D8%A7%D8%B4%D9%88_%D8%B9%D8%A7%D8%B1%D9%8A_%D8%A7%D9%84%D8%AE%D9%8A%D8%A7%D8%B4%D9%8A%D9%85 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (2017). Presence of the Yellowish-Orange Spotted Chromodorid Nudibranch (Risbecia pulchella [Hypselodoris pulchella] Rüppell & Leuckart, 1830) in the Sea of Fujairah, Gulf of Oman, Arab Sea, Indian Ocean. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 154, October 2017, pp. 1-19. Dubai and Sharjah, United Arab Emirates. http://marine-life-uae.webs.com/ 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (2017). The Semi-Striated Arminid Nudibranch (Dermatobranchus semistriatus Baba, 1949) : First Record from the Sea of Fujairah, Gulf of Oman. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 155, November 2017, pp. 1-15. Dubai and Sharjah, United Arab Emirates. http://marine-life-uae.webs.com/dermatobranchus-semistriatus 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (2017). Presence of the Sexy Anemone Shrimp (Thor amboinensis de Man, 1888) in the Sea of Kalba, Gulf of Oman, Arab Sea, Indian Ocean. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 156, December 2017, pp. 1-17. Dubai and Sharjah, United Arab Emirates. http://marine-life-uae.webs.com/sexy-shrimp 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (2018). Presence of the Banded Coral Shrimp (Stenopus hispidus Olivier, 1811) around the Snoopy Island, Emirate of Fujairah, United Arab Emirates, Gulf of Oman, Arab Sea. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 157, January 2018, pp. 1-13. Dubai and Sharjah, United Arab Emirates. http://marine-life-uae-2.webs.com/ 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (2018). Presence of the White Dilapidated Dorid Nudibranch (Goniobranchus obsoletus Rüppell & Leuckart, 1831) in Fujairah Sea, Gulf of Oman, Arab Sea, Indian Ocean. Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 158, February 2018, pp. 1-13. Dubai and Sharjah, United Arab Emirates. http://nudibranch.webs.com/ 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (Photography) (2018). Ola Khalaf’s Nudibranch Sea Slug (Diaphorodoris olakhalafi Khalaf, 2017). بُزاق بحر عُلا خلف عاري الخياشيم ( ديافورودوريس عُلا خلفي خلف ، 2017) . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 159, March 2018, pp. 1-22. Dubai and Sharjah, United Arab Emirates. (In Arabic & English). http://nudibranch.webs.com/diaphorodoris-olakhalafi 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (Photography) (2018). Nudibranch and Sea Slug Species of the United Arab Emirates – Part 1. أنواع بُزاق البحر وعاريات الخياشيم من دولة الإمارات العربية المُتحدة – الجُزء 1 . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 160, April 2018, pp. 1-38. Dubai and Sharjah, United Arab Emirates. (In Arabic & English). http://nudibranch.webs.com/nudibranch-uae-1 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (Photography) (2018). Kuroda’s Sea Hare Sea Slug (Aplysia kurodai Baba, 1937) : First Record from the Sea of Bidyah, Gulf of Oman, Arabian Sea, Indian Ocean. التسجيل الأول لبُزاق أرنب قواع البحر كورودا من بحر البِدية ، خليج عُمان . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 161, May 2018, pp. 1-11. Dubai and Sharjah, United Arab Emirates. (In Arabic & English). http://marine-life-uae-2.webs.com/aplysia-kurodai 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (Photography) (2018). Presence of the Tasseled Blenny (Parablennius thysanius D. S. Jordan & Seale, 1907) in the Fujairah Sea, Gulf of Oman, Arabian Sea, Indian Ocean. تواجد سمكة الدلينس (بليني) ذات الشراشيب في بحر الفجيرة ، خليج عُمان ، بحر العرب ، المُحيط الهِندي . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 162, June 2018, pp. 1-13. Dubai and Sharjah, United Arab Emirates. (In Arabic & English). http://uae-fish.webs.com/ 

Khalaf-Sakerfalke von Jaffa, Prof. Dr. Sc. Norman Ali Bassam Ali Taher Mohammad Ahmad Mostafa & Ola Mostafa Esmail Mostafa Khalaf (Photography) (2018). Presence of the Pikachu Nudibranch Sea Slug (Thecacera pacifica Bergh, 1883) in the Dibba Sea, Gulf of Oman, Arabian Sea, Indian Ocean. تواجد بُزاق البحر بيكاتشو عاري الخياشيم في بحر دِبا ، خليج عُمان ، بحر العرب ، المُحيط الهِندي . Gazelle: The Palestinian Biological Bulletin. ISSN 0178 – 6288. Number 163, July 2018, pp. 1-21. Dubai and Sharjah, United Arab Emirates. (In Arabic & English). http://nudibranch.webs.com/thecacera-pacifica

صُور لبُزاق البحر بيكاتشو عاري الخياشيم ، والبُزاق ذو البُقع البُرتقالية ، والبُزاق ذو الزوائد الشعرية ، وحلزونة البحر الفُقاعية . عدسة عُلا خلف . تم النشر بمجلة ناشيونال جيوغرافيك العربية ، عدد أغسطس 2017 ، الصفحات 84-85  

Photos of the 3 Nudibranchs: Thecacera pacifica, Gymnodoris impudica, Flabellina rubrolineata; and the Bubble Sea Snail Hydatina physis. Photos by Ola Khalaf, Scientific Description by Prof. Dr. Norman Khalaf. National Geographic AlArabiya Magazine. Abu Dhabi, United Arab Emirates. Volume 21, No. 83, August 2017, 84-85 pp. https://www.facebook.com/NatGeoAlArabiya/photos/pcb.1380585798661844/1380579018662522/?type=3&theater & http://nudibranch.webs.com/nudibranch-uae-1 & http://nudibranch.webs.com/thecacera-pacifica

Khalaf, Ola (31.12.2016). Nudibranch Risbecia pulchella Photo. Facebook. https://www.facebook.com/photo.php?fbid=1834215446831832&set=pb.100007301827082.-2207520000.1488819431.&type=3&theater 

Khalaf, Ola (28.03.2017). Nudibranch Dermatobranchus semistriatus. Facebook. https://www.facebook.com/photo.php?fbid=1878358892417487&set=a.1378764229043625.1073741825.100007301827082&type=3&theater

Khalaf, Ola (02.04.2017). Sexy Shrimp (Thor amboinensis). Facebook. https://www.facebook.com/photo.php?fbid=1880941872159189&set=a.1408184479434933.1073741829.100007301827082&type=3&theater 

Khalaf, Ola (09.05.2017). Kuroda’s Sea Hare (Aplysia kurodai). Facebook. https://www.facebook.com/photo.php?fbid=1899929073593802&set=a.1408184479434933.1073741829.100007301827082&type=3&theater 

Khalaf, Ola (16.05.2017). Banded Coral Shrimp (Stenopus Hispidus). Facebook. https://www.facebook.com/photo.php?fbid=1903627009890675&set=a.1408184479434933.1073741829.100007301827082&type=3&theater 

Khalaf, Ola (21 May 2017). Nudibranch Goniobranchus obsoletus. Facebook. https://www.facebook.com/photo.php?fbid=1906079649645411&set=a.1414987132088001.1073741830.100007301827082&type=3&theater 

Khalaf, Ola (26.06.2017). Pikachu Nudibranch Sea Slug (Thecacera pacifica). Facebook. https://www.facebook.com/photo.php?fbid=1925639587689417&set=a.1408184479434933.1073741829.100007301827082&type=3&theater 

Khalaf, Ola Mostafa (July 2017). Marine Life UAE 1. Little Black Book. ZNO Photo Books, San Francisco Bay Area, California, USA. 24 pp. http://www.zno.com/prod-assets/app/littlebook/index.html?initGuid=e368MRlQeps%3D&timestamp=1500735409300&isPreview=true & http://share.asovx.com/prod-assets/app/littlebook/index.html?initGuid=e368MRlQeps%3D&timestamp=1500735409300&isPreview=true 

Khalaf, Ola (Photos) & Prof. Norman Khalaf (Scientific Description) & Mohammad Taher (Report) (August 2017). A Photographic Diary: Emirates Seas: Marine Pearls. يوميات مُصورة : بحار الإمارات : لآلئ بحرية . National Geographic AlArabiya Magazine. Abu Dhabi, United Arab Emirates. Volume 21, No. 83, August 2017, 80-89 pp. http://www.ngalarabiya.com/issues/aug-2017/%D9%84%D8%A2%D9%84%D8%A6-%D8%A8%D8%AD%D8%B1%D9%8A%D8%A9/

Khalaf, Ola & Gary Copp (10.08.2017). Photo Identification of Kuroda’s Sea Hare (Aplysia kurodai). Facebook. Nudibranch Central. https://www.facebook.com/photo.php?fbid=1947337368852972&set=gm.1914379418820793&type=3&theater 

بُزاق البحر بيكاتشو عاري الخياشيم من بحر دِبا على عُمق 19 متراً .. عدسة الغواصة الكابتن عُلا خلف .. تم نشر هذه الصورة في مجلة ناشيونال جيوغرافيك العربية ، عدد أغسطس 2017 ، الصفحة 85-86 

Pikachu Nudibranch Sea Slug (Thecacera pacifica), 19 meters deep, from the Dibba Sea. Photo by PADI Dive Instructor Ola Mostafa Khalaf. This photo was published in National Geographic AlArabiya, August 2017, page 85-86. https://www.facebook.com/photo.php?fbid=1951781295075246&set=a.1414987132088001.1073741830.100007301827082&type=3&theater & http://nudibranch.webs.com/thecacera-pacifica

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