Neogastropoda

Clea sp., a Thai fresh­wa­ter snail.

Neogas­tropods can usu­ally be rec­og­nized by their long in­cur­rent siphon and ac­com­pa­ny­ing siphonal struc­ture on the base of the shell. Nearly all neogas­tropods are ma­rine. Clea is a rare fresh­wa­ter genus.

Con­trib­u­tors

John B. Burch (au­thor), Mol­lusk Di­vi­sion, Mu­seum of Zo­ol­ogy, Uni­ver­sity of Michi­gan-Ann Arbor.

Glossary

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.

ectothermic

animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature