Pseudobiceros damawan Newman and Cannon, 1994
The diagnostic character of this species is the mottled grey and white background with an orange coloration medially and marginally, and cover with sparse black spots.
External anatomy: Mottled grey and white transparent background with some black spots scattered on the dorsal surface. The median line of the body is light orange as well as the orange marginal band which is interrupted with some white spots. Presence of a black rim dorsally and ventrally. The ventral side is cream with a mottled orange marginal band. The body is raised on the longitudinal median line, and the pseudotentacles are square and ruffled, each with two well defined groups of numerous pseudotentacular eyes. Cerebral cluster of about 50 small eyespots. Pharynx with simple folds and two male pores well separated.
Internal anatomy: The male complex consists of two male gonopores, each one leading to an independent male system. Each system consist of unbranched vas deferens, an irregurlaly round seminal vesicle connected to a short and coiled ejaculatory duct, an oval and small prostatic vesicle and a pointed and long stylet housed in a shallow antrum. There is a single female system with a shallow antrum and a short vagina surrounded by the big amounts of cement glands.
This species has been reported for Madang and Laing in Papua New Guinea, and Heron Island in the Great Barrier Reef, Australia.
This species has been found associated to colonial ascidians, under boulders at the reef crest and on the reef slope
The holotype is a set of serial histological sections and the paratype is a whole mount of an entire specimen deposited at the Queensland Museum in Brisbane, Australia.
The species shows a cryptic coloration when found with ascidians. It was included into the group 4, characterized by spots, dots and mottling, according to the categorization based on the color and color pattern made by Newman & Cannon (1994). Within this group, P. fulvogriseus and P. gardineri also are mottled grey but they do not have the marginal orange band with black spots as P. damawan.