Polyplacophora includes 800 species of chitons, or coat-of-mail molluscs. Chitons have elongate, bilaterally symmetrical, dorsoventrally flattened bodies with an oval outline. The shell covers most of the dorsal surface and consists of eight overlapping calcareous plates. Chitons are adapted for life attached to hard surfaces on turbulent shores although many live in quieter deeper water.
Last update:June 24, 2013 at 12:35:05 UTC