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This species is Phestilla sp. 3 in IPN page 373 and Gosliner et al. (2015) page 358, let me quote IPN:
"This undescribed species is whitish or brownish in color with a broad body. There are transverse wrinkles across the notum. Cerata cylindrical with a constriction just before the rounded apex."
This species was misidentified and posted on 7 February 2011 at these websites as Phestilla lugubris (Bergh, 1870) [Cratena],
Dr. Alicia Hermosillo McKowen labeled it Phestilla shaggy mouse. I changed it on 15 December 2016 into
Phestilla sp. 03 Genus: Bergh, 1874.
Cella et al. (2016) moved it to the Genus Tenellia A. Costa, 1866 in the Family Fionidae J.E. Gray, 1857.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch &Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
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 18 December 2016, Tenellia sp. 03 Genus: A. Costa, 1866
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tenellia_sp_03.htm