Fig. 5

Muusoctopus aegir Golikov, Gudmundsson & Sabirov, sp. nov. Hectocotylus and male reproductive anatomy. a, paratype BS-70–1-2018 (pre-mature male, mantle length (ML) 29 mm, the Barents Sea): hectocotylus; b, d, e, BS-HH-244–2012 (mature male, ML 36 mm, off Svalbard): hectocotylus (b), fresh, spermatophoric complex (d), dissected, ventral view, and spermatophore (e); c, BIOICE-2789 (early maturing male, ML 27 mm, Iceland): hectocotylus; f, g, BS-255–2010 (mature male, ML 28 mm, off the Barents Sea slope): tentative spermatophore (f) and spermatophore-like structure (g). Scale bars: a–c, e–g = 1 mm, d = 5 mm. Abbreviations: ag, accessory gland; ca, calamus; cb, cement body, di, diverticulum; ea, ejaculatory apparatus; he, head; sd, sperm duct; sg, spermatophoric glands; sr, seminal reservoir; ss, spermatophoric sac; th, thread; to, terminal organ