Genus Catablema Haeckel, 1879

Type species: Turris vesicaria A. Agassiz, 1862 (Kramp, 1959) .

Remarks: For the diagnosis see Schuchert (2007). The genus currently comprises the species Catablema vesicarium (A. Agassiz, 1862), C. multicirratum Kishinouye, 1910, and C. nodulosum Bigelow, 1913 . According to Hartlaub (1914), Kramp (1959, 1961, 1968), Arai & Brinckmann-Voss (1980), and Schuchert (2007), the three can be distinguished as follows, characteristics that were also used to identify the present material:

C. vesicarium ‒ up to 32 tentacles, rarely 48, bell size up to 3 cm, in North Atlantic and Arctic Sea C. nodulosum ‒ 8 to 16 tentacles, bell-size up to 2 cm, in North Pacific

C. multicirratum ‒ 80 to 160 tentacles, bell size up to 6 cm; in North Pacific and Arctic Sea.