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Description
Phestilla is a genus of aeolid nudibranchs in the family Trinchesiidae and is accepted in WoRMS. Unlike most of its relatives, which eat hydroids, Phestilla feeds on hard corals, and adults have no cnidosacs. The genus is recorded from tropical and subtropical coral reef regions; Wikipedia lists about ten species and notes that undescribed species exist.
Identification
The genus is mainly recognised by its unusual diet (hard corals) and by the absence of cnidosacs in adults, which is an internal feature. In a Nudi Pixel description of one species the cerata are cylindrical and grouped into about eight fan-shaped clusters on each side, but this is a species-level description, not a genus diagnosis.
Species in this genus (3)
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