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.