Abdopus tonganus (Hoyle 1885)

Octopus tonganus Hoyle, 1885

DIAGNOSIS.—Animal small (30 mm ML, 33 mm ML). Mantle broad, blunt posteriorly (MWI 80, 93); neck narrow to only slightly constricted; head small (HWI 73, 60). Funnel organ W-shaped, thick, outer limbs shorter than median limbs. Arms long (ALI 86, 85), arm order irregular, but arms I shortest and arms II and III longest. Sucker size large (SIn 13, 17), deeply set into surface of arms, proximal 3 suckers uniserial, suckers biserial distally. In males, suckers 11–13 on arms II and III especially enlarged (SIe 23). Ligula minute (LLI 1.3), slender, side inrolled obscuring deep groove, rugae absent. Web exceptionally shallow (WDI 6–7). Gill lamellae 6 (both syntypes). Ovarian eggs minute, capsule 1.2 mm long, stalks short (∼0.5 mm). Penis moderate in size (PLI 30), nearly straight, with short diverticulum. Surfaces of mantle, head, and arms rugose, covered with scattered, small, round papillae. Two supraocular cirri on each side of head, anterior one large, multifid; posterior one small, simple. Color dorsally purplish black, ventrally pale yellow tan with few scattered dark spots.

ORIGINAL DESCRIPTION.—Hoyle, 1885:225.

TYPE LOCALITY.—Western tropical Pacific Ocean, Tonga Islands, Tongatapu, from reefs.

TYPES.—Syntypes: BMNH 1889.4.24.22–23, 1 male, 30 mm ML, 1 female, 33 mm ML.

DISTRIBUTION.—Known only from the type locality.