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Mesonychoteuthis hamiltoni : ウィキペディア英語版
Colossal squid

The colossal squid (''Mesonychoteuthis hamiltoni'', from Greek ''mesos'' (middle), ''onycho'' (claw, nail), and ''teuthis'' (squid)), sometimes called the Antarctic or giant cranch squid, is believed to be the largest squid species in terms of mass. It is the only known member of the genus ''Mesonychoteuthis''. It is known from only a few specimens, and current estimates put its maximum size at long and weighing possibly up to 750 kg (1,650 lb),〔http://www.unmuseum.org/colossalsquid.htm〕〔Anderton, H.J. 2007. (Amazing specimen of world's largest squid in NZ ). New Zealand Government website.〕 based on analysis of smaller and immature specimens, making it the largest known invertebrate.
==Morphology==
Unlike the giant squid, whose arms and tentacles only have suckers lined with small teeth, the colossal squid's limbs are also equipped with sharp hooks: some swivelling, others three-pointed.〔(Te Papa: Hooks and Suckers ). Blog.tepapa.govt.nz (2008-04-30). Retrieved on 2011-09-30.〕 Its body is wider and stouter, and therefore heavier, than that of the giant squid. Colossal squid are believed to have longer mantles than giant squid, but shorter tentacles.
The squid exhibits abyssal gigantism. The beak of ''M. hamiltoni'' is the largest known of any squid, and more robust than that of the giant squid. The colossal squid also has the largest eyes documented in the animal kingdom; a partly collapsed specimen measured in diameter, with a pupil.〔 The eye was estimated to be 30 to 40 cm (12 to 16 in) when the squid was alive.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Colossal squid」の詳細全文を読む



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