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单词 Cephalopoda
释义
Cephalopoda

Biology
  • The most advanced class of molluscs, containing the squids, cuttlefishes, octopuses, and the extinct ammonites. Cephalopods have a highly concentrated central nervous system within a protective cartilaginous case. The eye has a well-developed retina and is comparable to that of vertebrates. All cephalopods are predacious carnivores capable of swimming by jet propulsion; they have highly mobile tentacles for catching and holding prey. Octopuses have a large central brain, highly developed vision, and also groups of neurons (‘sub-brains’) in each of their eight tentacles that function semi-autonomously, e.g. when sensing and handling objects. They are now regarded as highly intelligent, with short- and long-term memory and capabilities such as problem-solving, tool use, recognition of individual humans, and play.


Geology and Earth Sciences
  • Literally ‘head- foot’, a class of Mollusca, exclusively marine, related to the Bivalvia and Gastropoda. The class includes the Nautiloidea (nautiloids), Sepioidea (cuttlefish), Teuthoidea (squids), Octopoida (octopuses), and the extinct Ammonoidea (goniatites, ceratites, ammonites) and Belemnitida (belemnites). The earliest forms belonged to the Nautiloidea and date from the Upper Cambrian.


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