Narrow Fold Group - ANCISTROCHEIRIDAE / CHIROTEUTHIDAE / CYCLOTEUTHIDAE

　　Wing shoulder thicken high ridge-like with a deep wide groove at jaw angle; LRL = 1.5 HL
--Ancistrocheirus lesueuri
　

　Wing shoulder low, translucent at LRL=3.2mm, covering wing teeth; wing teeth large trapezoidal; LRL =1.5 HL
--Chiroteuthis imperator
　

　　Wing shoulder low, translucent at LRL=6mm, covering wing teeth; wing teeth narrow plate-like; LRL =2 HL
--Discoteuthis sp.
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