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

[3][2] All species were transferred to Tenellia as a result of a DNA phylogeny study in 2016.

[4] The genus was dismembered and broken into several smaller genera in 2017 with further DNA evidence and a re-interpretation of genus and family characteristics.

[5] Trinchesia species feed on hydroids.

Species in the genus Trinchesia included:[2] Species names currently considered to be synonyms: