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B. magister was designated by Berry (1913) based on two large specimens from Puget Sound, Washington. Berry (1912）gave a detailed description, drawings and photos of these specimens as a different form of Gonatus fabricii in his "Cephalopods of western North America". Later he obtaind a true G. fabricii from the Irish coast in the Atlantic and considered that the Puget Sound specimens represented a new species and named it Gonatus magister. Naef (1921) placed this species in a new genus Berryteuthis based on Berry's description, characterized by having large fines (FL>1/2ML) and no hooks on the clubs. Until Pearcy and Voss (1964) described B. anonychus from off Oregon, B. magister was the sole species of the genus Berryteuthis.
A Berryteuthis with ...
- length to 42-43 cm ML and weight to 2.2-2.6 kg.
- large hooks present in medial series of arms I-III in large individuals of both sexes.