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Tenellia sp. 28  Genus: A. Costa, 1866

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Tenellia sp. 28 is characterized by a broad brown middorsal band, starting between the oral tentacles , ending at the last pair of cerata. The smooth rhinophores and oral tentacles are translucent, the posterior/upper half with the same brown as the middorsal band. At the base of the cerata is the body translucent whitish/tan. The cerata are basally translucent tan and have a swelling at the whitish apex, between the swelling and the body are opaque white longitudinal lines. Gorden Tillen sent only dorsal views, so I can't say how a lateral view looks like, especially below the cerata.
I've got on 29 October 2010 more shots showing: below the whitish/tan area of the cerata is also a brown band on each side, which starts at the oral tentacles and unites with the middorsal band behind the cerata. The 'tail' is brown. Below the lateral brown band is a whitish/tan region, followed again by a thin brown longitudinal line.
Very similar is Eubranchus sp. 02 which is clearly IPN Eubranchus sp. 4, and differs by the white spots on the rhinophores and by the cerata which lack white longitudinal lines.
This species was posted on 18 October 2010 at these websites as Eubranchus sp. A  Genus: Forbes, 1838,
with the comment: "Eubranchus sp. A and Eubranchus sp. 02 are most probably variants of the same species, but I keep them seperate for now."
I changed it on 21 July 2011 into Eubranchus sp. 01  Genus: Forbes, 1838,
for some genera, such as Tenellia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even if '01' looks a little bit stupid, and now is only the genus italic written.
I changed it on 22 March 2012 into Trinchesia sp. 28  Genus: von Ihering, 1879,
because I found by chance at NUDIPIXEL 4 pictures of the same species taken by Indra Swari at Bali, Indonesia, with the identification verified by
Dr. Richard Willan: #1, #2, #3, and #4.
My original comment was wrong, this species and Eubranchus sp. 02 are distinct, so my original decision to keep them seperate turned out to be right!
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 6 January 2017 Trinchesia sp. 28  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 6 January 2017, Tenellia sp. 28  Genus: A. Costa, 1866
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tenellia_sp_28.htm