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 Topironemo coronatum n. gen n. sp. (Trichostrongyloidea, Obeliscoidinae) from the cricetid Holochi lus brasiliensis or <<water rat>> in Argentina (Type material) and fro m Tapirus terrestris in French Guyana (voucher material in poor condit ion). The new genus is characterized by a corona radiata, on oesophage al tooth, a bilaterally synlophe with about 73 (male), 122 (female) cu ticular ridges, a caudal bursa Pattern 2-1-2 with rays 5 and 6 paralle l and close together and rays 5 longer than rays 3. The mosi closely r elated genus is the monospecific Teporingonema Harris, 1985, from a Me xican lagomorph, Romerolagus. The cephalic extremity oi this parasite is redescribed after the type-material. The systematic position of Tep oringonema amongst the Obeliscoidinae is defined and the hypotheses co ncerning the origin of this sub family are provided.