Macrochlaena winckworthi (Robson 1926)

Octopus winckworthi Robson, 1926

DIAGNOSIS.—Animals small to medium-sized (32.8 ML). Mantle elongate (MWI 58.8), widest medially; neck slightly constricted, nearly confluent to mantle (HWI 51.5); eyes small, deeply set into head. Funnel short, nipple-like, funnel organ VV-shaped, outer limbs about 33% shorter than inner limbs. Arms short (ALI 64.1), subequal in length; arms tapering to tips but not filiform. Suckers small in size (SIn 4.6), slightly elevated; especially enlarged suckers absent in males and females. Right arm III of male hectocotylized (HALI 136.4), shorter than fellow arm (FAI 76.9); ligula short (LLI 4.3), triangular, with shallow medial groove and thickened borders; calamus small (CLI 14.3), triangular, pointed, HASC 40. Web deep (WDI 32.1), web formula C > D > B > A > E. Gill lamellae 10. Radula simple, with A2 seriation of rachidian. Surfaces of mantle, head, and arms finely papillose. Ventral and oral surfaces smooth. Several small, warty papillations above and below each eye. General color in preservation (alcohol) tan with darker brown mottling on dorsal surfaces of mantle, head, and arms.

ORIGINAL DESCRIPTION.—Robson, 1926:161, figs. 1–6.

TYPE LOCALITY.—Northern Indian Ocean, southern India, Tuticorin.

TYPE.—Holotype: BMNH 1925.11.23.1, male, 32.8 mm ML, in alcohol, good condition, pliable. Beaks, radula, and one gill not with the type and must be considered no longer extant.

DISTRIBUTION.—Known positively only from the type locality.