Cerithiidae
Cerithium crawling out of a bucket. The common name for Cerithium is "horn shell." This species was collected on mud in a mangrove swamp. Note the long snout, and the tentacles, which are short, stubby, and have eyes at their tips.
Note the anterior apertural canal; also the operculum attached to the back of the posterior foot.
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