Hysterothylacium

Garrido-Olvera, Lorena, García-Prieto, Luis & León, Gerardo Pérez-Ponce De, 2006, Checklist of the adult nematode parasites of fishes in freshwater localities from Mexico, Zootaxa 1201, pp. 1-45 : 15

Hysterothylacium sp.

Intestine.

MICHOACÁN: El Infiernillo: Ictalurus balsanus , Oreochromis aureus , Poeciliopsis balsas ( 110). TABASCO: Usumacinta (Tenosique): Ictalurus furcatus ( 62).

Note: Specimens collected in both States were included in the genus Thynnascaris , which is considered as a synonym of Hysterothylacium ( 28). Nematodes from Michoacán were identified as Thynnascaris habena (Linton) ( 110); however, this record was considered doubtful after voucher specimens were examined ( 149). A recent study pointed out several discrepancies between Mexican specimens and Linton’s original description, and for this reason these nematodes were considered as belonging to Hysterothylacium sp.( 50).