Tenellia

Tenellia is a genus of sea slugs, aeolid nudibranchs, marine gastropod molluscs in the family Trinchesiidae.

==Taxonomic history== This was a small genus until a DNA phylogeny of the former family Tergipedidae resulted in most species of Cuthona being transferred to this genus. Miller (2004) restricted the genus Cuthona (Alder & Hancock, 1855) to the type species, C. nana (Alder & Hancock, 1842), and transferred to the genus Trinchesia the rest of the species previously included in Cuthona. Miller has been followed by some authors, and has not been followed by others - and there is currently much instability on the extension and contents of these two genera. Cella et al., 2016 hypothesised that the genus Tenellia should include many former Cuthona and Trinchesia species, with others being placed in new genera. Since then, there has been much shuffling of species between genera, many species being returned from Trinchesia to Tenellia, and others being placed in several smaller genera, Catriona, Diaphoreolis, Phestilla, and Zelentia.