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Tenellia sp. 14  Genus: A. Costa, 1866

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Tenellia sp. 14 has a translucent whitish-blue body. The smooth rhinophores are mottled translucent and white. The oral tentacles are translucent white with orange at their base. The cerata are also translucent white with a swelling near the apex. There is diffuse orange at the base of the ceratal swelling.
Hard to write more on this 5 mm specimen. I think it is a juvenile, even the genus is a wild guess!
This species was posted on 16 July 2011 at these websites as Trinchesia sp. 14  Genus: von Ihering, 1879.
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 30 December 2016 Trinchesia sp. 14  Genus: von Ihering, 1879 to the Genus Tenellia  A. Costa, 1866.
Pretty similar is
Tenellia sp. 05  Genus: A. Costa, 1866 which differs by annulate rhinophores, by the oral tentacles which have a less vividly coloured band, and by the cerata which lack a swelling.
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
How to cite:
Köhler, E. (2016), published 30 December 2016, Tenellia sp. 14  Genus: A. Costa, 1866
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tenellia_sp_14.htm