Gazelle : The Palestinian Biological Bulletin (ISSN 0178 – 6288) . Number 158, February 2018, pp. 1-13. | Page 2

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White Dilapidated Dorid Nudibranch (Goniobranchus obsoletus Rüppell & Leuckart, 1831) from
the Inchcape 10 diving site, 24 meter deep in the Sea of Fujairah, Gulf of Oman … Photo by Ola
Khalaf … 05.05.2017 ... http://nudibranch.webs.com/
Goniobranchus obsoletus is a species of colourful sea slug, a dorid nudibranch, a marine
gastropod mollusc in the family Chromodorididae (Wikipedia).
Description
Goniobranchus obsoletus is a chromodorid nudibranch with a mostly white mantle and an
orange mantle edge. There is an irregular band of blue-black just inside the orange
margin and the mantle is rugose with an orange-brown reticulation between the raised
pustules. The rhinophores and gills are translucent brown with white markings
(Wikipedia).
Distribution
This species was described from the Red Sea (Wikipedia). It has also been reported from
the Arabian Gulf and Gulf of Oman.
Etymology
Gonio: Greek ‘Gonia’, angle (Wiktionnaire). ‘Brankhia’ in Greek gills (Reef Resident).
Obsoletus: Latin ‘obsoletus’, hackneyed, worn-out, dilapidated (OPK-Opistobranquis).
Gazelle : The Palestinian Biological Bulletin – Number 158 – February 2018