Costasiella sp.

Photographed by: Graham Abbott
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Opisthobranchia |
| Order: | Sacoglossa |
| Family: | Costasiellidae |
| Species: | Costasiella sp. |
Comment from Richard Willan on photo #916
Costasiella species all have their eyes situated close together on top of their head (not shown in this image) and they are intimately associated with green algae of the genus Avrainvillea, on which they feed.Locality:
- Indonesia
- Bali (1)
- Philippines
- Anilao (1)