MICROSOMACANTHUS-KAULOBATRONI N-SP AND WA RDIUM-NEOTROPICALE N-SP, PARASITES OF HIMANTOPUS-MELANURUS IN PARAGUAY

The authors describe and illustrate two hymenolepidid cestodes parasit ising Himantopus melanurus (Aves) from Paraguay. Microsomacanthus kaul obatroni n. sp., 20-30 long x 0.6 mm wide, with 10 diorchoid hooks 33- 38 mu m long, three testes in a transverse row, short cirrus 20-28 mu m long armed with very minute spines, a short vagina with a sphincter, and a multi-lobed ovary, with genital ducts similar to those of Hymen olepis himantopodis (sensu Fuhrmann, 1906) but with rostellar hooks di fferent from those of Toenia himantopodis Krabbe, 1869 sp, inq. Wardiu m neotropicale n. sp., 40-50 long x 0.9 mm wide, has campanulate progl ottides, scolex with 10 aploparaksoid rostellar hooks 9 mu m long, tes tes arranged in a triangle, a short cirrus pouch without a transverse retractor muscle, very short, unarmed cirrus, a short vagina with a sp hincter (30-35 mu m in diameter) but no retractor muscle, a multi-lobe d ovary and a bipartite uterus. The shape of the hooks distinguishes t his species from T. himantopodis Krabbe, 1869 and other aspects of its anatomy from other species of Wardium with hooks of a similar size. A single specimen of a third Hymenolepis (sensu late) species (lacking the scolex) could not be identified.