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Tenellia sp. 21  Genus: A. Costa, 1866

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Tenellia sp. 21 is characterized by its transparent body, cerata, rhinophores, and oral tentacles, covered with opaque white spots. The ceratal wall is transparent, distinctive is the ceratal core: translucent greyish with a medial violet ring, and an opaque yellow subapical ring, the apex is white. The rhinophores are basally transparent with with opaque white spots, then translucent brownish, the apices are white. The oral tentacles are translucent brownish with white markings.
To my knowledge is this the only picture of this species, it is not in IPN nor at the internet!
This species was posted on 5 September 2011 at these websites as Trinchesia sp. 21  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 2 January 2017 Trinchesia sp. 21  Genus: von Ihering, 1879 to the Genus Tenellia  A. Costa, 1866.
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. (2017), published 2 January 2017, Tenellia sp. 21  Genus: A. Costa, 1866
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tenellia_sp_21.htm