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Order Cephalaspidea, Bubble Shells

Hawaii has many types of opisthobranchs, better known as sea slugs, some of which are undescribed species.  Many species experience population surges, abundant some years and absent others, or seasonal surges.  Most live less than a year and will be found near the specific food they eat including seaweed and a wide assortment of small invertebrates such as sponge, cnidarians, and mollusks.  Slugs that feed upon green seaweed store ingested chloroplast cells within their mantle for photosynthesis.  Sea Hares produce a purple ink from red algae when disturbed.  Others may produce toxic compounds from food or store stinging cells in the body as defense against predators.  Animals with somewhat transparent flesh will assume the color of their prey.  Opisthobranchs are found under stones, on shaded walls, or within caverns.  The pelagic Glaucus atlanticus floats on the sea surface.  As with many invertebrates more may be seen at night.

Pittman & Fiene's Sea Slugs of Hawaii website

 

HAWAII

Hydatina amplustre

SWOLLEN BUBBLE

 

Micromelo undatum

WAVY BUBBLE

 

Haminoea cymbalum

CYMBAL BUBBLE

 

Atys semistriatus

STRIATED BUBBLE

 

Atys curta

 

Diniatys dentifer

 

Haminoea sp. 2

 

Haminoea sp. 5

 

Haminoea natalensis

 

Phaneropthalmus cylindricus

CYLINDRICAL BUBBLE

 

Smaragdinella calyculata

CALYX BUBBLE

 

Bullina lineata

LINED BUBBLE

 

Hydatina physis

PAPER BUBBLE

 


NORTHEAST PACIFIC

Bulla gouldiana

GOULD'S BUBBLE