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A cephalopod is any member of the molluscan class Cephalopoda (Greek plural Κεφαλόποδα (kephalópoda); "head-feet"). These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishermen sometimes call them inkfish, referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology.

PZ Myers frequently mentions his love of cephalopods, uploading a new cephalopod picture weekly onto his blog, Pharyngula, as part of the Friday cephalopod series.

Having a tentacle[edit | edit source]

  1. What must it be like to have a tentacle?
  2. Can we imagine having something as weird as a tentacle?
  3. How bizarre must it be if an animal or even an intelligent being has a tentacle?
  4. Does it make you feel creepy even to think of having a tentacle?
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