Spanish dancer, Hexabranchus sanguineusSea slugs are various marine invertebrates that resemble terrestrial slugs. Most are gastropods, sea snails that do not have a shell or have an internal shell.
NOTE: We are not experts on these species. If you find we have misidentified one, or can identify one we could not, please let us know.
Nudibranchs are the most common sea slugs.
Dorid nudibranchs have a mantle which overlaps the sides of the foot. Most have a ring of gills surrounding the anus. The rhinophores are layered.
Spanish dancer, Hexabranchus sanguineus
Halgerda-like taringa, Taringa halgerda
Batangas halgerda, Halgerda batangas
Magnificent chromodoris, Chromodoris magnifica
Co's chromodoris, Chromodoris coi
Dark-margin glossodoris, Glossodoris atromarginata
Purple-spotted hypselodoris, Hypselodoris purpureomaculosa
Bullock's hypselodoris, Hypselodoris bullocki
Magnificent ceratosoma, Ceratosoma magnificum
Reticulated chromodoris, Chromodoris reticulata
Funeral jorunna, Jorunna funebris
Goniobranchus geometricus
Dark-spotted platydoris, Platydoris cf inframaculata
Pimpled phyllidiella, Phyllidiella pustulosa
Bumpy paradoris, Paradoris liturata
Chamberlain's nembrotha, Nembrotha chamberlaini
Miller's nembrotha, Nembrotha milleri
Crested nembrotha, Nembrotha cristata
Kubaryana's nembrotha, Nembrotha kubaryana
Yellowlined roboastra, Roboastra luteolineata
Strawberry nudibranch, Gymnodoris aurita
Gloomy tambja, Tambja morosa
Black-horn thecacera, Thecacera sp.
Pacific thecacera, Thecacera pacifica
Flatworm discodoris, Discodoris boholiensis
Dendronotid nudibranchs have elongated bodies with cerata on their dorsal sides. The cerata do not contains extensions of the digestive system. The rhinophores have a sheathe.
Coleman's melibe, Melibe colemani
White-spotted Marionia, Marionia sp.
arminid nudibranchs
White-spotted Janolus, Janolus sp.
Janolus sp.
Aeolid nudibranchs have cerata containing cnidosacs.
Yamasu's cuthona, Cuthona yamasui
Sea hares have a small flat internal shell.
Pleurobranchs are sea slugs with a prominent mantle and an internal shell that is reduced or lost completely in adults.
Forskal's pleurobranch, Pleurobranchus cf forskalii
Headshield slugs are considered sea slugs. Some bubble shell species have thin bubble-like shells. In most species the shell is reduced or internal. The head shield is used to plow beneath the sand.
Lovely headshield slug, Chelidonura amoena
Lamellarids are slug-like sea snails with an internal shell, hidden beneath a papillate mantle with lateral flaps.
Chelyonotus (Chelinotis, Coriocella) semperi
Egg masses
Unknown
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Last modified 10 June 2025