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Trinchesia sp. 23  Genus: von Ihering, 1879

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Trinchesia sp. 23 is characterized by its translucent brownish body. The oral tentacles and the foot are translucent with opaque white spots. The smooth rhinophores are transcendent with opaque white spots, and have a translucent orange-brownish medial band, and another translucent orange-brownish subapical band. There are patches of pale yellow and pale blue on the head, and just behind the rhinophores. The cerata have two swellings, a large basal swelling, which is mottled translucent white, on the outer end of the swelling is a diffuse yellowish band, followed by a translucent band with dark blue spots, each of them on a larger bright blue spot, followed by another diffuse yellowish ring, followed by the smaller apical swelling, which is also mottled white.
This picture of two 17 - 18 mm specimens was posted on 21 July 2011 as Cuthona sp. E  Genus: Alder & Hancock, 1855,
then changed into Trinchesia sp. 05  Genus: von Ihering, 1879, I thought they might be adults, and the other specimens juveniles, because the colour pattern of the cerata, rhinophores, and oral tentacles is very similar. Gordon Tillen sent on 14 September 2011 the picture of another specimen, which is for sure the same species. Now I think they are distinct species, so I keep them seperate.
Pretty similar at least with blue and yellow on the head are:
Trinchesia sp. 05 which differs by the bluish-white body, by the medial yellowish line, and by the cerata, which lack the two swellings,
Abronica sp. 01 which differs by "V"shaped blue and yellow on the head, and
Trinchesia sp. 13 which differs by red spots on the cerata
Cella et al. (2016) restricted the genus Cuthona  Alder & Hancock, 1855 to the type species, C. nana (Alder & Hancock, 1842) just like Miller (2004) did, and synonymised the genera
- Catriona  Winckworth, 1941,
- Phestilla  Bergh, 1874,
- Cuthona  Alder & Hancock, 1855 (partim), and
- Trinchesia  Ihering, 1879
with Tenellia  A. Costa, 1866 in the Family Fionidae  J.E. Gray, 1857.
I moved on 3 January 2017 Trinchesia sp. 23  Genus: von Ihering, 1879 into the genus Tenellia  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 back on 2 November 2017 into Trinchesia sp. 23  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 2 November 2017, Trinchesia sp. 23  Genus: von Ihering, 1879
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Trinchesia_sp_23.htm