Hydrobiidae
Great Lakes area freshwater snails. Hydrobiids are small to very minute aquatic prosobranch snails. The family has world-wide distribution, and a great many genera and species.
Glossary
- bilateral symmetry
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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
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animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature