Tapironema coronatum n. Gen., n. Sp. (Trichostrongyloidea - Cooperiidae - Obeliscoidinae), a parasite of Holochilus brasiliensis and Tapirus terrestris

In this paper we provide a description of Tapironema coronatum n. gen. n. sp. (Trichostrongyloidea, Obeliscoidinae) from the cricetid Holochilus brasiliensis or « water rat » in Argentina (Type material) and from Tapirus terrestris in French Guyana (voucher material in poor condition). The new genus is characterized by a corona radiata , an oesophageal tooth, a bilaterally synlophe with about 73 (male), 122 (female) cuticular ridges, a caudal bursa pattern 2-1-2 with rays 5 and 6 parallel and close together and rays 5 longer than rays 3. The most closely related genus is the monospecific Teporingonema Harris , 1985, from a Mexican lagomorph, Romerolagus . The cephalic extremity of this parasite is redescribed after the type-material. The systematic position of Teporingonema amongst the Obeliscoidinae is defined and the hypotheses concerning the origin of this sub family are provided.