Abstract
Onychoteuthid squids are among the most common cephalopods found in New Zealand waters, and comprise a major portion of the regional diets of teuthophagous marine mammals. Although several recent publications have addressed aspects of various species’ biology and reproduction, the systematics of the group remains poorly understood. Herein the ontogenetic and adult morphologies of regionally occurring known species of the genera Moroteuthis, Onychoteuthis, and Notonykia are redescribed, and Notonykia nesisi sp. nov. is described for the first time. Ontogenetic and sexually dimorphic variation in characters and character states associated with body proportions, and beak, radula, tentacular hook, palatine tooth and gladius morphologies are also described and compared between local onychoteuthid taxa for the first time.
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