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

Abstract

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.