Costasiella formicaria can be found on sandy areas at dive sites around Romblon Island. The body of this sea slug is mostly translucent and has some black markings. The cerata can be green to black and often have white spots.
We love macro and super macro photography and especially finding rare and special critters around
our island home. We do our best in identifying all critters on this website correctly; however, we
might make mistakes that can be present on this website.
Please keep in mind that this website is created for scuba divers, underwater photographers, and
everybody interested in marine animals. This website is created and organized from a diver’s and an
underwater photographer’s point of view. That’s why we primarily group animals together in a
meaningful way for divers and underwater photographers.
Please feel free to contact us via email at email@example.com if you have any further questions or suggestions.