Commonly Seen Species
The following 40 opisthobranch species  are among the most commonly seen by divers. Some of them are seen "all the time" while others only occasionally. Also, we've selected them just based on their frequency in photo galleries and our experience--other choices are possible. Please remember that they represent only about 8% of the species in Hawaiian waters. So, if you can't find an exact match go here: http://seaslugsofhawaii.com/index.html


Hydatina amplustre

Micromelo undatum

Siphopteron quadrispinosum

Chelidonura hirundinina





Haminoea cymbalum

Aplysia argus

Aplysia parvula

Stylocheilus striatus





Plakobranchus ocellatus

Thuridilla neona

Umbraculum sp. #2

Berthellina delicata





Asteronotus cespitosus

Halgerda terramtuentis

Peltodoris fellowsi

Platydoris formosa





Ardeadoris poliahu

Ardeadoris tomsmithi

Ceratosoma tenue

Diversidoris flava