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Nembrotha cf. yonowae  Göthel & Debelius, 1992

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Nembrotha yonowae or perhaps something closely related, or at least similar in appearance.
Nembrotha yonowae was described from a single specimen from Maaya Tila, Ari Atoll, Maldives. It is characterized by a black body covered with orange pustules of which ~30 % have a green ring around the bases. The rhinophores are black, with the anterior side of the lamellae orangered and the posterior side some green pigment between the black and orangered. The foot has an orange margin, the gills are black with green margins. The oral tentacles are orange.
Göthel & Debelius (1992) write the type specimen was deposited at
Univ. Coll of Swansea, Dept. of Zoology, Singleton Park, Swansea DA28pp, Wales, UK.
Pola et al (2008) write "We considered that since there are no specimens of N. yonowae to examine, the type locality of both species is the same and the external description is identical, so N. guttata and N. yonowae are synonyms." and "Further morphological and molecular studies need to be done to fully resolve these issues."
Nembrotha cf. yonowae is black or red with scattered orange/red pustules, it differs from from Nembrotha yonowae by the colour of the rhinophores and lacks the orange margin of the foot, and the brigt green rings around the pustules. Nembrotha guttata was described by Nathalie Yonow from the Maldives with the rhinophore pockets black with an orange edge, almost all Nembrotha cf. yonowae specimens from the Philippines have a white patch at the base of each rhinophore pocket.
Pola et al (2008) proposed to replace Nembrotha guttata Yonow, 1993 with Nembrotha yonowae   Goethel & Debelius, 1992.
Bill Rudman discusses the possible synonymy at the Sea-Slug Forum I quote: ..."it seems premature to synonymise that name and N. guttata as they might both turn out to be valid species."
Pretty similar are:
Nembrotha livingstonei which has a distinctive white cross-like marking between the rhinophores.
Nembrotha sp. 02 which has blue rhinophores and gills,
Nembrotha sp. 04 which has black rhinophore pockets with an orange edge, and lacks the white patch at the base of each rhinophore pocket,
Nembrotha sp. 08 which differs by the bright blue margin of the foot, by greenish pustules with red caps, and by blue/green gills
Bill Rudman discusses the possible synonymy at the Sea-Slug Forum, I quote: ..."it seems premature to synonymise that name and N. guttata as they might both turn out to be valid species."
I followed Bill Rudman and posted this species on 29 June 2003 at these websites as Nembrotha cf. guttata  Yonow, 1993.
On 8 December 2016 I decided to follow Pola et al (2008) and changed it into
Nembrotha cf. yonowae  Göthel & Debelius, 1992, the first author of the publication is Helmut Göthel not Goethel
The description of Nembrotha yonowae was published in a German non-scientific journal
References:
Helmut Göthel und Helmut Debelius. – 1992. Nacktschnecken der Malediven, mit der Beschreibung einer neuen Art.
DATZ (Die Aquarien und Terrarienzeitschrift), 1992(8): 512-519.
This text is almost unavailable and in German! I can email/send a pdf if you like! Erwin
Pola, M., Cervera, J.L. and Gosliner, T.M. 2008. Revision of the Indo-Pacific genus Nembrotha (Nudibranchia: Dorididae: Polyceridae), with description of two new species.
Scientia Marina 72(1): 145-183
Rudman, W.B., 2008 (Mar 7). Comment on A red-spotted Nembrotha and N. yonowae by David Abecasis. [Message in] Sea Slug Forum.
Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21144
Many more pictures of Nembrotha cf. yonowae, - most possibly several species -, from the Western Pacific ocean are at the Mediterranean Slug Site! There is a picture of Nembrotha yonowae as Nembrotha guttata at http://species-id.net/wiki/Nembrotha_guttata!
More information on Nembrotha cf. yonowae as Nembrotha cf. guttata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 8 December 2016, Nembrotha cf. yonowae  Göthel & Debelius, 1992
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Nembrotha_yonowae_cf.htm