Inioteuthis Verrill, 1881

Bello, Giambattista, 2020, Evolution of the hectocotylus in Sepiolinae (Cephalopoda: Sepiolidae) and description of four new genera, European Journal of Taxonomy 655, pp. 1-53: 40

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Inioteuthis Verrill, 1881


Inioteuthis Verrill, 1881  

Fig. 12 View Fig

Inioteuthis Verrill, 1881: 417   .

Type species

Inioteuthis japonica Verrill, 1881   , by subsequent designation.


Sepiolinae   with fins rounded; their length about half mantle length. Suckers biseriate on all arms. Tentacle club suckers in 8 to 10 longitudinal rows. Mantle-head occipital band narrow (not reaching over the ocular globes). Visceral photophores absent. Gladius absent. Ventral mantle margin slightly sinuate, without any deep funnel indentation. Hectocotylus (male left arm I) tripartite: basal part with three suckers, two ventral and one dorsal; copulatory apparatus broadly enlarged, ear-shaped, involving about six dorsal and seven ventral modified sucker pedicels; dorsal pedicels (may bear vestigial suckers) lengthened, rolled ventrally, joined by a broad web proximally crossing the arm oral face to reach ventral formation of three horn-like pedicels, connected with each other by narrow web, so that a webbed structure delimits meso-proximally a hollow; proximal horn-like pedicels of ventral row followed distally by a void hence by about four deeply modified pedicels combined into a trough-like formation; distal part with several enlarged suckers in ventral row, first one very large, laying on trough-like structure of copulatory apparatus. Female bursa copulatrix pouch-like.

Included species

Inioteuthis japonica Verrill, 1881   and I. maculosa Goodrich, 1896   .


An Indo-Pacific genus that presently includes two species (see above). A third species usually listed in this genus, namely Inioteuthis capensis Voss, 1962   , in fact does not belong to it ( Young & Vecchione 2004), since according to its original description I. capensis   bears a roundish light organ embedded in the ink sac, a trait that does not pertain to Inioteuthis   . Hence, capensis   is excluded from this genus and placed in Rondeletiola   (see below).




Inioteuthis Verrill, 1881

Bello, Giambattista 2020


Verrill A. E. 1881: 417