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Onychoteuthids are small (ca. 7 cm ML) to large (ca. 150 cm ML), muscular squids that have two series of smooth-ringed suckers on the arms and two series of hooks on the tentacular clubs (rarely marginal suckers as well). Some species are common open ocean squids (e.g., Onychoteuthis spp.); others live near the ocean floor along continental or island slopes (bathyal region) (e.g., Onykia spp.).
DiagnosisAn oegopsid ...
- with buccal connectives attaching to ventral borders of arms IV.
- with hooks on tentacular clubs.
- with rostrum on conus of gladius.