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Title: CYATHOSTOMUM MONTGOMERYI AND ITS PLACE IN THE SUBFAMILY CYATHOSTOMINAE (NEMATODA: STRONGYLIDAE)

Author
item KHARCHENKO, V - INST ZOOLOGY, UKRAINE
item Lichtenfels, James
item KRECEK, ROBINA - UNIV PRETORIA, SO AFRICA

Submitted to: World Association for the Advancement of Veterinary Parasitologists
Publication Type: Abstract Only
Publication Acceptance Date: 1/2/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Cyathostomum montgomeryi Boulenger, 1920, a common parasite of zebras, has not been redescribed since its original description. It is still almost unknown outside of Africa. This species was placed into Murshidiinea (Hartwich, G., Mitt. Zool. Mus. Berl., 1986, 62, 61-102). We have studied 210 specimens from E. burchelli from Etosha and Kruger National Parks (Republic of South Africa) and made measurements of 15 males and 15 females. Nematodes were fixed in 4% formalin and studied in temporary mounts cleared in 80% phenol in glycerol with the aid of interference contrast light microscopy. This species has two corona radiata or leaf crowns surrounding the mouth. The internal leaf crown (ILC) is inserted near the middle of the buccal capsule. The external leaf crown (ELC) has fewer elements than the ILC. The extra-chitinous supports are similar to those of C. catinatum. The distal end of the spicules are identical to others in the Cyathostominea but differ from those in the Murshidiinea. The bursa is typical for Cyathostomum. Thus we retain this species in the Cyathostominea. Specimens we have measured were larger than those described by Boulenger. The bases of the ILC elements are inserted in a curved line on the wall of the buccal capsule and those of the ELC are recessed from the tips of the elements of the ILC on which they rest; all typical of other species of Cyathostomum. The walls of the buccal capsule of this species are similar to those of Coronocyclus labratum. However, the extra-chitinous supports of the ELC adjoin the anterior edge of buccal capsule and that is why we place C. montgomeryi in the genus Cyathostomum.