Tetrastemmatidae

Tetrastemmatidae is a family of worms belonging to the order Monostilifera.

species of worm

Tetrastemma is a genus of nemerteans belonging to the family Tetrastemmatidae.

Prostoma is a genus of freshwater nemerteans, containing the following species: Prostoma asensoriatum Montgomery, 1896 Prostoma canadiensis Gibson & Moore, 1978 Prostoma communopore Senz, 1996 Prostoma eilhardi (Montgomery, 1894) Prostoma graecense (Böhmig, 1892) Prostoma hercegovinense Tarman, 1961 Prostoma jenningsi Gibson & Young, 1971 Prostoma kolasai Gibson & Moore, 1976 Prostoma ohmiense Chernyshev et al., 1998 Prostoma puteale Beauchamp, 1932 thumb|Angled view of Prostoma sp.