Prosthiostomidae Lang, 1884

- Euryleptoidea of long, slender or elongated oval form of the body, with rounded anterior end and without any trace of tentacles and gonopores separate.

- About five genera are known and are separated on details of the reproductive structures

Prosthiostomum      Quatrefages, 1845

Ethymology :       - Prosthio = forward, stomum = mouth Ventral characteristics :       - The mouth lies in the anterior region and the extremely muscular, tubular pharynx is directed anteriorly       - They have eyes in two cerebral clusters or fan-like clusters over the head region       - The sucker is well developed and lies posteriorly Dorsal characteristics :       - These flatworm have an elongate body with a rounded anterior and tapering posterior       - Any trace of tentacles

Publications :

Faubel, (1984) : The Polycladida, Turbellaria. Proposal and establishment of a new system. Part II. The Cotylea . Mitteilungen des hamburgischen zoologischen Museums und Instituts 80. 189–259.
    Newman, L.J. & Cannon, L.R.G. (2003). Marine Flatworms: the world of Polyclads. CSIRO Publishing : Melbourne 112