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Promachoteuthis sulcus : ウィキペディア英語版 | Promachoteuthis sulcus
''Promachoteuthis sulcus'' is a species of promachoteuthid squid. It is distinguished from related taxa on the basis of several morphological features: nuchal fusion between the head and mantle, much larger size of arm suckers compared to club suckers, greater width of tentacle base than arm base, a recessed club base, and the presence of an aboral tentacle groove.〔Young, R.E., M. Vecchione & C.F.E. Roper 2007. A new genus and three new species of decapodiform cephalopods (Mollusca: Cephalopoda). ''Reviews in Fish Biology and Fisheries'' 17(2–3): 353–365. 〕 ''P. sulcus'' is known from a single specimen caught by the German research vessel R/V ''Walther Herwig'' in an open net off Tristan da Cunha, southern Atlantic Ocean (), at a depth of .〔 ==References==
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