Pseudoceros monostichos Newman and Cannon, 1994
Type material location
The holotype is a whole mount of a complete specimen deposited at the Queensland Museum in Brisbane, Australia. Additionally, there is a set of serial histological sections from a mature specimen deposited in the same Museum.
The diagnostic character for this species is the cream background with a median black-brown longitudinal line surrounded by a white line and a narrow light brown band. Presence of four indistinct marginal bands.
External anatomy: Body tapered posteriorly with a dorsal surface of an unusual dimpled texture. Cream background with a narrow black-brown longitudinal median line which doesn’t reach the anterior and posterior margins. This line is bordered by a white narrow band and surrounded by a light brown narrow band. There are four indistinct marginal bands; the inner one is yellow intensifying to green, then blue and a purple rim. The ventral side is cream with the same marginal bands and a median brown longitudinal stripe. The pseudotentacles are somewhat pointed formed by folds of the anterior margin. The cerebral cluster of eyes is obscured due to dark pigment of the median line. Ruffle pharynx with elaborated folds.
Internal anatomy: The male apparatus is formed by a large seminal vesicle connected to an uncoiled ejaculatory duct, oval prostatic vesicle and a small stylet housed in a shallow and wide antrum. The female system is characterized by a shallow antrum with a short and muscular vagina surrounded by the cement glands.
Ecology and Distribution
This species has been found in Heron Island in the Great Barrier Reef, Australia, and Madang in Papua New Guinea.
Evolution and Systematics
Newman & Cannon (1994) included this species into the group 3 characterized by longitudinal stripes, according to the categories created by the same authors, based on the color and color pattern. This species is unique in this group due to the unusual pattern on the ventral surface being more strikingly than the dorsal side. This is the only species within group 3 with a narrow median brown line.
Newman, L.J. & Cannon, L.R.G. (1994) Pseudoceros and Pseudobiceros (Platyhelminthes, Polycladida, Pseudocerotidae) from Eastern Australia and Papua New Guinea. Memoirs of the Queensland Museum, 37: 205–266.