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Trinchesia sp. 43  Genus: A. Costa, 1866

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Trinchesia sp. 43 is characterized by its solid white colour, including body, cerata. The smooth rhinophores are basally translucent white, the outer half is orange. The oral tentacles are orange, and there is a distinctive orange band on the anterior end of the head between the oral tentacles.
Pretty similar at least with a solid white body and cerata are:
Trinchesia sp. 03 which differs by an opaque white patch on the head, has orange, white and orange bands on the rhinophores and lacks the orange line between the oral tentacles, and
Trinchesia sp. 06 which has also an orange line on the anterior end of the head between the oral tentacles, but differs by thin opaque white lines on the white cerata.
This species was posted on 24 June 2017 at these websites as Tenellia sp. 43  Genus: A. Costa, 1866.
Korshunova et al. (2017) restricted the genus Tenellia  A. Costa, 1866 to this 3 species:
-Tenellia adspersa (Nordmann, 1845)
-Tenellia chaetopterana Ekimova, Deart & Schepetov, 2017 and
-Tenellia fuscata (Gould, 1870)
and reinstated the family Trinchesiidae  F. Nordsieck, 1972 with the genera
-Catriona  Winckworth, 1941
-Diaphoreolis  Iredale & O'Donoghue, 1923
-Phestilla  Bergh, 1874
-Rubramoena  Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
-Tenellia  A. Costa, 1866
-Trinchesia  von Ihering, 1879 and
-Zelentia  Korshunova, Martynov & Picton, 2017
and moved it again into the genus Trinchesia  von Ihering, 1879.
I changed it on 6 November 2017 into Trinchesia sp. 43  Genus: von Ihering, 1879.
References:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
Miller, M.C. 2004. An appraisal of the identity of the New Zealand species of the aeolid nudibranch family Tergipedidae (Gastropoda: Opisthobranchia).
Journal of Natural History 38: 1183-1192.
Kristen Cella, Leila Carmona, Irina Ekimova, Anton Chichvarkhin, Dimitry Schepetov & Terrence M. Gosliner (2016)
A Radical Solution: The Phylogeny of the Nudibranch Family Fionidae.
PLoS ONE 11(12): e0167800. doi:10.137 1/journal .pone.0167800
The above publication is completely online, open access, CC-license
Korshunova, T.; Martynov, A.; Picton, B. (2017). Ontogeny as an important part of integrative taxonomy in tergipedid aeolidaceans (Gastropoda: Nudibranchia) with a description of a new genus and species from the Barents Sea.
Zootaxa. 4324(1): 1., available online at https://doi.org/10.11646/zootaxa.4324.1.1
How to cite:
Köhler, E. (2017), published 6 November 2017, Trinchesia sp. 43  Genus: von Ihering, 1879
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Trinchesia_sp_43.htm