ORDER : POLYCLADIDA
Sub order : ACOTYLEA
Super family : Euryleptoidea
Family : Prosthiostomidae

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