Orientatractis Petter, 1966

David González-Solís & Jean Mariaux, 2017, Orientatractis brycini sp. nov. (Nematoda: Atractidae) from characiform freshwater fishes in Gabon, Africa, Revue suisse de Zoologie 124 (1), pp. 1-8 : 2

Genus Orientatractis Petter, 1966

Type species: O. levanhoai Petter, 1966

Emended generic diagnosis: Small nematodes with a complex structure of the apical extremity. Oral opening surrounded by 6 (2 lateral and 4 submedian) poorlydeveloped lips. One or two circlets of oral papillae. Each submedian lip bearing a chitinoid piece formed by two well-sclerotized, recurved, pointed spines and a single large median spine. Lateral lips small, supporting large amphids; two small spines posterior to each amphidial pore present or not. Grooves or narrow lateral alae present, extending from first third of esophagus to posterior end of body, but not reaching tail tip. Esophagus divided in a cylindrical corpus, elongated isthmus, and posterior, well-developed or not, valved bulb. Nerve ring surrounding isthmus at its anterior end. Deirids small, knob-like, somewhat anterior or at level of nerve ring. Excretory pore at mid-length of corpus or slightly anterior to esophageal bulb. Tail long and thread-like. Males with two unequal, similar spicules and small gubernaculum. Females monodelphic, viviparous, with vulva near anus. Parasites of freshwater turtles, frogs and fish.