Cyathostominae (Nematoda) parasites of Equus caballus in some Brazilian states

Thirty six horses from nine Brazilian states (Goias, Minas Gerais, Para, Ma ranhao, Piaui, Paraiba, Pemambuco, Rio Grande do Norte, and Ceara) were exa mined for infections by small strongyles. The following species were identi fied: Cylicocyclus nassatus, C. insigne, C. brevicapsulatus, C. leptostomum , C. radiatus, C. ultrajectinus, C. ashworthi, Cylicostephanus goldi, C. ca licatus, C. minutus, C. longibursatus, Petrovinema poculatum, Coronocyclus coronatus, C. labiatus, C. labratus, Cyathostomum catinatum, C. pateratum, C. alveatum, Parapoteriostomum euproctus, Cylicodontophorus bicoronatus, Po teriostomum ratzii, P. imparidentatum and Gyalocephalus capitatus. The most prevalent were C. longibursatus (100%), C. nassatus (97.22%) and C. catina tum (94.44%). They were also the most abundant species, comprising 31.84, 2 3.71 and 14.14%, respectively, of the Cyathostominae parasites found. Infec tions were found to include 2-17 species in a single horse, with variable a ssociations. (C) 1999 Elsevier Science B.V. All rights reserved.