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Cephalopoda   Listen
noun
Cephalopoda  n. pl.  (Zool.) The highest class of Mollusca. Note: They have, around the front of the head, a group of elongated muscular arms, which are usually furnished with prehensile suckers or hooks. The head is highly developed, with large, well organized eyes and ears, and usually with a cartilaginous brain case. The higher forms, as the cuttlefishes, squids, and octopi, swim rapidly by ejecting a jet of water from the tubular siphon beneath the head. They have a pair of powerful horny jaws shaped like a parrot's beak, and a bag of inklike fluid which they can eject from the siphon, thus clouding the water in order to escape from their enemies. They are divided into two orders, the Dibranchiata, having two gills and eight or ten sucker-bearing arms, and the Tetrabranchiata, with four gills and numerous arms without suckers. The latter are all extinct except the Nautilus. See Octopus, Squid, Nautilus.






Collaborative International Dictionary of English 0.48








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"Cephalopoda" Quotes from Famous Books



... any other of the mollusca. If the lower had not an anterior existence, the higher were not developed from them. It is also a conclusive argument against the system, that while the intermediate mollusca are very numerous, the cephalopoda, which were so early introduced, and are the higher forms that were so numerous at certain times, are now narrowed down to a ...
— The Christian Foundation, Or, Scientific and Religious Journal, Volume I, No. 7, July, 1880 • Various



Words linked to "Cephalopoda" :   Dibranchia, family Nautilidae, Nautilidae, cephalopod mollusk, phylum Mollusca, subclass Dibranchiata, cephalopod, Mollusca, subclass Dibranchia, class Cephalopoda, class



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