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O. loennbergii is one of two species of Onykia known to occur in the high North Pacific (the other is O. robusta). O. loennbergii is the smaller of the two species reaching a length of 307 mm ML (Tsuchiya and Okutani, 1991).
An Onykia ...
- with rhomboidal fin but slightly drawn-out posteriorly.
- with longitudinal ridges and warts in skin.
- with gladius rostrum having a triangular cross-section.