Semigordionus

Semigordionus is a genus of worms belonging to the family Chordodidae This genus is associated with freshwater habitats.

Reproduction
This genus is Dioecious, containing both male and female reproductive organs

Differentiation
This genus is differentiated from Gordionus is on the posterior end, showing a row of pre-cloacal bristles that is continuous anteriorally and not divided in two lateral rows.

Species:
 * Semigordionus circumannulatus Heinze, 1952