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Idioteuthis cordiformis
''Idioteuthis cordiformis'' is a species of whip-lash squid found in tropical regions of the west Pacific Ocean. The species is commonly known as the 'love-heart squid' because the species name ''cordiformis'' is Latin for 'heart shaped'. Recently, this species has been found to consume shark.〔http://deepseanews.com/2015/03/squid-1-shark-0/〕
==Description==
''Idioteuthis cordiformis'' is a large, deep-sea species that attains a mantle length (body length) of over one meter in length.〔Braid, 2013〕 Although multiple specimens have been carefully observed, they are often damaged during capture. Therefore, different authorities have described variations in the colouration of this species: pale flesh-pink, yellowish with small reddish-brown chromatophores, dark purple pigmentation with purple chromatophores overlaid with greyish tubercles, or having thickly crowded deep brownish chromatophores. In life, these animals appear dark red or purple 〔http://tolweb.org/Idioteuthis_cordiformis/19510〕 Like all squids, it has eight arms. Like other species in this family, it also has two long, whip-like tentacles. The tentacles of this species are unique in this family in that they contain some large suckers, while other mastigoteuthids have small to microscopic suckers. The largest tentacle suckers of ''I. cordiformis'' are nearly the same size as the arm suckers, but the size deminishes towards the very ends of the tentacles and the suckers become very small 〔
The skin is rough and covered with small, conical tubercules on round plaques. The dark red or purple pigment is found in densely packed chromatophores but there are no photophores present on the skin.〔(Tree of Life Web Project )〕 However, each eye has a large crescent shaped photophore.〔 The head is separated from the mantle by a collar. The funnel is widely connical with a recurved end. The funnel attaches to the mantle with a locking apparatus. The funnel component has the form of a human ear, while the mantle component is shaped like a human nose. Like most squids, the eyes are large and highly developed, with relatively large lobes of the brain dedicated to their control.〔(Deep-Sea Cephalopods )〕 The posterior end of the mantle has a heart-shaped fin, which extends three quarters of the way along the mantle.〔Chun, C. 1910. Die Cephalopoden. Oegopsida. Wissenschaftliche Ergebnisse der Deutschen Tiefsee Expedition auf dem Dampfer "Valdivia" 1898-1899, 18(1):1-401.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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