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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Cephalopod
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1992-09-03
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Type of predatory marine mollusc with the
mouth and head surrounded by tentacles. They
are the most intelligent, the fastest-moving,
and the largest of all animals without
backbones, and there are remarkable
luminescent forms which swim or drift at
great depths. Cephalopods have the most
highly developed nervous and sensory systems
of all invertebrates, the eye in some
paralleling closely that found in
vertebrates. Examples include octopus, squid,
and cuttlefish. Shells are rudimentary or
absent in most cephalopods. Typically they
move by swimming with the mantle (fold of
outer skin) aided by the arms, but can squirt
water out of the siphon (funnel) to propel
themselves backwards by jet propulsion. They
grow very rapidly and may be mature in a
year. The female common octopus lays 150,000
eggs after copulation, and stays to brood
them for as long as six weeks. After they
hatch the female dies, and, although
reproductive habits of many cephalopods are
not known, it is thought that dying after
spawning may be typical.