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T. rhombus is a large, muscular squid (ca. 100 cm ML max.) found throughout tropical and subtropical regions of the world's oceans. It occupies near-surface waters during the night and midwaters during the day. It has rather short arms and large triangular fins that extend the full length of the mantle. It is fished commercially in the Sea of Japan and off Okinawa.
An oegopsid ...
- with "lazy T"-shaped groove of funnel locking-apparatus.
- with very muscular mantle.