Ommastrephes d’Orbigny, 1834

Ommastrephes d’Orbigny, 1834 View in CoL in 1834–1847: 45.

Synonyms

(?) Cycria Leach in Gray, 1849: 58. Listed as synonym of Ommastrephes [fide Hoyle (1910: 408)]. Type species with no type given [fide Hoyle (1910: 408)]

Lolimnites Risso, 1854: 41 View in CoL . [fide Adam (1942: 17)] Type species Lolimnites meridionalis Risso, 1854 View in CoL , by monotypy.

Ommatostrephes Lovén, 1845: 122 View in CoL . Emendation of Ommastrephes d’Orbigny 1834 View in CoL in 1834–1847 [fide Hoyle (1910: 411)].

Type species: Loligo bartramii Lesueur, 1821 .

Diagnosis: The following diagnosis was adapted from the morphological description of Roper et al. (2010); additional paralarval characters have been added following the descriptions of Sweeney et al. (1992), Young & Hirota (1990), Sakurai et al. (1995) and Vijai et al. (2015), as reviewed by Fernández-Álvarez et al. (2017).

Maximal mantle length 1020 mm. Mantle wide; posterior end without pronounced pointed tail. Fins rhomboidal; slightly attenuate posteriorly. Fin length 40–50% and width 60–85% of mantle length; fin angle 46–65°. Funnel groove with foveola with five to eight, occasionally nine, longitudinal folds and two to five (usually three or four) distinct side pockets. Small, scattered, subcutaneous photogenic tissue embedded in tissue of mantle, head and ventral arms, without large dorsal mantle photophore or ocular or intestinal photophores. Long, broad, silvery or golden opalescent strip along ventral midline from anterior fin edge to mantle opening and similar ventral strip on ventral surface of head and ventral arms; relatively dense aggregations of small subcutaneous photogenic tissue under opalescent tissue. Arms with 24–35 pairs of arm suckers. Arm tips not attenuate; tips of trabeculae of protective membranes do not project beyond edge of membrane. Ventral protective membranes of arms III wide and in adult females expanded into large, triangular, membranous lobe; in males, right or left ventral arm hectocotylized, with tip lacking suckers. Tentacle suckers covering ~60% of tentacle length. Four to seven suckers with denticulate rings present on carpus proximal to first carpal knob. Carpal-locking apparatus on tentacular stalk with two to five knobs and two to four smooth-ringed suckers. Largest medial manus suckers with four enlarged, pointed teeth, one at each quadrant. Dactylus of tentacular club with four series of small suckers. Cone flags of gladius short, rhomboidal, with distinct radial creases. Greatest width of cone flags ~56% width of rachis. Marginal rigidity ribs of rachis doubled. Axial rigidity rib of rachis wide rounded-rectangular in cross-section. Lateral plates of gladius not adhered to dorsal surface of rachis but forming wide free folds over rachis. Stem of rachis short; width of stem slightly greater than its thickness. Cone short and laterally flattened. Rostrum absent. Thick alveola covered with tiny ribs and thorns. Monoflagellate spermatozoon. Hatchlings with skin sculpture; without ocular or visceral photophores. Two rows of pegs present in proboscis suckers; diameter of lateral proboscis suckers 200% that of central suckers and with unequal number of pegs. Three leaflets in the gills.