Fig. 16
From: A review of the genus Muusoctopus (Cephalopoda: Octopoda) from Arctic waters
Muusoctopus sibiricus (Løyning, 1930) [62]. Beak and radula. a–c, LS-L-3 (pre-spent male, mantle length (ML) 38 mm, Laptev Sea): upper (a) and lower (b) beak, and unworn section of radula (c); d, ESS-A-19 (mature male, ML 39 mm, East-Siberian Sea): unworn section of radula. Scale bars: a, c = 1 mm, b, d = 100 µm. Abbreviations: l1, first lateral tooth; l2, second lateral tooth; m, marginal tooth; r, rachidian tooth