Body gelatinous, transparent. Mantle elongate-oval, rounded behind. Head small, narrow, fused with mantle, poorly differentiated from arms. Eyes small, subrectangular, directed laterally. Optic ganglia far from brain. Mantle opening single, wide, reaching approx. level of eyes. Funnel of moderate length, not fused with head. Arms 1st-3rd pair subequal, in juveniles nearly as long as ML, in adults 2-3 times ML, 4th slightly shorter. Arm tips tapering. Web very deep, in juveniles almost reaching arm ends, in adults approx. 40-50% maximum arm length. Suckers small, not numerous, urn-shaped, sunken into arm tissues, widely spaced at the base, converging and slightly enlarged beyond web margin, edge-to-edge at the very tips. Digestive gland long, slender, cigar-shaped, pointed; stomach in front of it. Ink sac on dorsal side of digestive gland. Inner demibranch of gills lacking. No photophores. Radula heterodont, not comb-like, rachidial teeth multidentate, others unidentate. End of 3rd left arm hectocotylized in adult males, shorter than 3rd right arm. Female ovoviviparous, eggs (many hundreds, approx. 4 mm in length) incubated in widened distal oviducts. Adults nearly colorless, with sparse, small, red-violet chromatophores. ML up to 11 cm, total length to 45 cm. Newborn larvae (ML approx. 2.2 mm) almost transparent, encased in jelly coating, easily identifiable by small deeply pigmented eyes, short arms (half ML), widely set basal suckers, and very long (nearly equal to ML), narrow, pointed digestive gland.