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Tenellia sp. 18  Genus: A. Costa, 1866.

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Tenellia sp. 18 has a translucent body scattered with opaque white spots on the dorsal region. The smooth rhinophores are basally translucent orange, the outer half is opaque white. The oral tentacles are basally translucent, diffusing into white. The cerata are in the basal half translucent orange, showing distinctive nodular digestive glands. Outer follow a broad diffuse white band, then a diffuse darker orange band, subapically is a broad diffuse orange band, the apices are whitish.
This picture shows also a specimen of Facelinidae sp. 04.
It looks somehow similar to Catriona sp. in IPN at page 371,
which differs by the cerata, which are swollen subapically, with a narrow tip, and by the thin subapical orange band, broad in Tenellia sp. 18.
The size of the above specimen was not recorded.
To my knowledge are these the only pictures of this species, it is not in IPN nor at the internet!
This species was posted on 30 July 2011 at these websites as Trinchesia sp. 18  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 31 December 2016 Trinchesia sp. 18  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. (2016), published 31 December 2016, Tenellia sp. 18  Genus: A. Costa, 1866
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tenellia_sp_18.htm