Euprymna Steenstrup, 1887

Bello, Giambattista, 2020, Evolution of the hectocotylus in Sepiolinae (Cephalopoda: Sepiolidae) and description of four new genera, European Journal of Taxonomy 655 (655), pp. 1-53 : 39-40

Euprymna Steenstrup, 1887

Fig. 7

Euprymna Steenstrup, 1887a: 43 .

Type species

Inioteuthis morsei Verrill, 1881 , by subsequent designation.

Diagnosis

Sepiolinae with fins rounded; their length about half mantle length. Arm suckers in 4, exceptionally 8 longitudinal rows. Tentacle club with numerous minute suckers in a few tens of longitudinal rows. Mantle-head occipital band broad, extending over the ocular globes.A pair of kidney-shaped photophores on ventral surface of ink-sac. Gladius absent. Ventral mantle margin slightly sinuate, without any deep funnel indentation. Hectocotylus (male left arm I) thicker than right arm I, bipartite: proximal part, occupying 1⁄5 to ½ of arm, with regular suckers, except for 1–3 modified pedicels (may bear vestigial suckers), lengthened papilla-like, in 3 rd to 5 th position of ventral sucker row; distalmost part, occupying ½ to *⁄5 of arm distally, with lengthened columnar sucker pedicels, closely packed to form longitudinal palisades, bearing at tip embedded suckers that are partially covered by fleshy caps, number of palisades proximally equal to that of regular sucker rows but reduced toward arm extremity. Female bursa copulatrix pouch-like.

Included species

Euprymna morsei ( Verrill, 1881) , E. albatrossae, Voss, 1962 , E. berryi Sasaki, 1929 , E. brenneri Sanchez et al., 2019 , E. hoylei Adam, 1986 , E. hyllebergi, Nateewathana, 1997 , E. megaspadicea Kubodera & Okutani, 2002 , E. penares (Gray, 1849) , E. scolopes Berry, 1913 , E. stenodactyla (Grant, 1833) and E. tasmanica (Pfeffer, 1884) .

Remarks

Some nominal tetraseriate sucker species are deemed unresolved (cf. Norman & Lu 1997). The biseriate sucker arm E. parva , E. pardalota and E. phenax , were removed from this genus to be placed into Eumandya gen. nov. (see above). The species in Euprymna are distributed in tropical and temperate waters of the Indo-West Pacific region ( Norman & Lu 1997; Nateewathana 1997; Kubodera & Okutani 2002; Reid 2011).

Figures

Fig. 7. Schematic drawing of the hectocotylus of Euprymna Steenstrup, 1887. Abbreviations: cop. app. = copulatory apparatus (after Norman & Lu 1997, modified).