Amphioctopus kagoshimensis (Ortmann 1888)

Octopus kagoshimensis Ortmann, 1888

DIAGNOSIS.—Animal medium-sized (40 mm ML). Mantle narrow, elongate-oval (MWI 31–42); neck narrow; head narrow (HWI 31–42). Funnel organ W-shaped. Arms moderate in length (ALI 71–79), arm order variable, but arms I always shortest. Suckers large (SIn 10–14); especially enlarged suckers absent in males. Ligula small (LLI 4–8), slender, central groove highly reduced. Web moderate to deep (WDI 22–30), sector D deepest, A shallowest. Gill lamellae 7–10. Mature eggs small, capsule 2.0 mm long × 0.5 mm wide. Penis long, slender, U-shaped with diverticulum, with connecting crossbar. Spermatophores long, larger than mantle (SpLI 120–250), sperm reservoir unarmed (crochets absent). Radula with A2–4 seriation (typically A2) of rachidian. Body covered with small warts or papillae with single multifid supraocular papillae. Color pale purple or vinous red with purple reticulations. Dark stripe or splotch between sucker bases on dorsal side of arms.

ORIGINAL DESCRIPTION.—Ortmann, 1888:644.

TYPE LOCALITY.—Western North Pacific Ocean, Japan, Kagoshima Prefecture.

TYPES.—Syntypes: UMS, 5 males, 4 females, now in macerated condition (fide Adam, 1960).

DISTRIBUTION.—See “Discussion.”