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Tenellia sp. 12  Genus: A. Costa, 1866

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Tenellia sp. 12 has a translucent body, the anterior region in front of the cerata is translucent pink, the dorsal region with cerata is whitish. The smooth rhinophores are basal translucent pink, the median third is translucent orange, the outer third is whitish. The cerata have at the base a dark purple ring, which diffuses into translucent blueish-purple, some of the apices are white. The oral tentacles are translucent orange.
This specimen was identified by Dr. Richard Willan, thanks!
This species is as Cuthona sp. 5 in IPN at page 362,
it was posted on 9 July 2011 at these websites as Trinchesia sp. L  Genus: von Ihering, 1879, and changed on 15 July 2011 into
Trinchesia sp. 12  Genus: von Ihering, 1879.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
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 28 December 2016 Trinchesia sp. 12  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 28 December 2016, Tenellia sp. 12  Genus: A. Costa, 1866
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tenellia_sp_12.htm