Pseudoceros goslineri, the Gosliner flatworm, is a marine flatworm species that belongs to the family Pseudocerotidae.

Distribution It is found in the tropical Indo-Pacific, from the eastern coast of Africa to the Micronesia, including the Red Sea.

Habitat External slope or top on coral reef.

Size Up to .

Physical characteristics "External anatomy: Flatworm with irregular and variable color pattern characterized mainly by a cream background mottled with orange, and pink and purple-red dots concentrated medially forming an elongated blotch. The margin consists of purple and pink irregular spots and dots that are more concentrated on the tentacles making the tips a little darker. The ventral side is light violet. Pseudotentacles formed by simple folds of the anterior margin with few marginal eyes. Cerebral cluster made of about 30 eyespots. Presence of a broad folded pharynx. Internal anatomy: The male reproductive system consists of unbranched vas deferens, an elongated seminal vesicle connected to a short and coiled ejaculatory duct, a round prostatic vesicle, and a small stylet housed in a deep antrum. The female system has a deep and tubular female antrum with curved cement pouches and a short vagina directed backwards and surrounded by the cement gland."Author Bolanos Marcela, extract from http://polycladida.lifedesks.org/pages/3088

Behaviour Benthic, diurnals, because of its aposematic colors, it has no fear to crawl around to feed.

Feeding Pseudoceros goslineri feeds on various colonial ascidians.

References Leslie Newman & Lester Cannon, "Marine Flatworms", CSIRO publishing, 2003, Neville Coleman, "Marine life of Maldives", Atoll editions, 2004, Andrea & Antonnella Ferrrari,"Macrolife", Nautilus publishing, 2003,

External links Pseudoceros goslineri Discover Life, Pseudoceros goslineri Vie Océane, Pseudoceros goslineri