Phestilla

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

Its members are unusual in feeding on hard corals, unlike other members of the family Trinchesiidae which feed on hydroids. Adult Phestilla have no cnidosacs. This genus has been investigated using DNA phylogeny and undescribed species exist.

Species
Species within the genus Phestilla include:
 * Phestilla chaetopterana (Ekimova, Deart & Schepetov, 2017)
 * Phestilla fuscostriata Hu, Zhang, Xie & Qiu, 2020
 * Phestilla goniophaga Hu, Zhang, Yiu, Xie & Qui, 2020
 * Phestilla lugubris (Bergh, 1870)
 * Phestilla melanobrachia Bergh, 1874
 * Phestilla minor Rudman, 1981
 * Phestilla panamica Rudman, 1982
 * Phestilla poritophages (Rudman, 1979)
 * Phestilla sibogae Bergh, 1905
 * Phestilla subodiosa A. Wang, Conti-Jerpe, J. L. Richards & D. M. Baker, 2020
 * Phestilla viei Mehrotra, Caballer & Chavanich in Mehrotra, Arnold, Wang, Chavanich, Hoeksema & Caballer, 2020

Species names currently considered to be synonyms:
 * Phestilla hakunamatata Ortea, Caballer & Espinosa, 2003 synonym of Hermosita hakunamatata (Ortea, Caballer & Espinosa, 2003)
 * Phestilla subodiosus A. Wang, Conti-Jerpe, J. L. Richards & D. M. Baker, 2020 : synonym of Phestilla subodiosa A. Wang, Conti-Jerpe, J. L. Richards & D. M. Baker, 2020 (incorrect gender agreement of specific epithet)