Thysanoteuthis is a genus of large squid, with the type species Thysanoteuthis rhombus being the best known.

The World Register of Marine Species accepts the following species: Thysanoteuthis filiferum (Hoyle, 1904) Thysanoteuthis major (J. E. Gray, 1828) Thysanoteuthis rhombus Troschel, 1857

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