Octopus parvus (Sasaki 1917)

Octopus parvus (Sasaki, 1917)

DIAGNOSIS.—Animal small (150 mm TL). Mantle elongated (MWI 61–81); neck distinctly constricted; head small (HWI 50–80). Funnel organ thin, W-shaped, outer limbs length of inner limbs. Arms moderate in length (ALI 70–90), arm order II > III > IV > I, but arms nearly subequal. Sucker size large (Sin 16–19), proximal 3 suckers uniserial, suckers biserial distally; especially enlarged suckers absent in males and females. Right arm III of males hectocotylized (HALI 271.4–300.0), subequal to fellow arm (FAI 97.4–115.2); ligula short (LLI ∼5), narrow, with smooth central groove; HASC 74–83. Gill lamellae 4–6. Ovarian eggs small, capsule 1.8 mm long. Spermatophores small (SPL 12 mm). Radula with symmetrical seriation of rachidian (A3?). Surface of body covered with beaded papillae.

ORIGINAL DESCRIPTION.—Sasaki, 1917:365, as Polypus parvus.

TYPE LOCALITY.—Western North Pacific Ocean, Japan, Kyushu, Shimizu Harbor.

TYPES.—Syntypes: ACS, 1 male, 1 female.

DISTRIBUTION.—Japan, Kagoshima Prefecture?