Photo & copyright by: Gordon Tillen, Bacong, Negros Oriental, Philippines

Trinchesia sp. 21  Genus: von Ihering, 1879
very similar is Eubranchus sp. 18, on the taxonomic placement read here)

Photo details:
size: unrecorded
depth: unrecorded
date: 21 February 2017
country: Indonesia
location: Bali Island,
Lesser Sunda Islands
divesite: unrecorded
thumbnail-selection of
Trinchesia sp. 21
  taxonomy of
Trinchesia sp. 21