White-Edged Flatworm

Pseudoceros lactolimbus is a species of flatworms, a member of Pseudocerotidae family.

Description

Background is velvety black, margin is narrow white fading to grey laterally. Ventrally dark grey. Cerebral eyespot is in oblong light grey area, pointed anteriorly with about 40 eyes. Size range: 15 x 9 mm (immature) to 48 x 25 mm (mature). Vas deferens branched. Seminal vesicle extremely large, oblong (3.8 mm long), ejaculatory duct straight; prostate large, oval (920 /lm long), prostatic duct short; stylet short and wide (220 /lm long x 110 /lm wide), length: width ratio = 1: 0.5; male antrum shallow. It has pointed marginal pseudotentacles with white tips.

Distribution

Inhabit reef crests and slopes, often under rubble. West Pacific from Philippines to E. Australia and New Caledonia.

Habitat

It is nocturnally active. It is found out on the reef slope (especially at night) and under rubble on the reef crest.