Bivalves - those with 2 shells
(Right) Larva of the Pacific oyster (Crassostrea gigas). Conspicuous velum is projecting from the shell. This is the organ used for swimming and feeding in the larval forms.
Cephalopods - "head foot"
(Right) Dosidicus gigas caught in the Sea of Cortez by Jay Vavra. Click right to see an larger image. Also, see the giant ganglion and axons studied by neurophysiologists.
Gastropods - "stomach foot"
(Right) Veliger larva of the red abalone (Haliotis rufescens). This larva is lecithotrophic and therefore must rely on maternally supplied energy reserves. See more on abalone.
