Studies on the parasites of zebra. 2. Cylicostephanus longiconus n. sp. (Nematoda: Strongylidae) from the mountain zebra, Equus sebra hartmannae (Matschie, 1898). Onderstepoort Journal of Veterinary Research, 50(3) 1983: 169-172. 169 [Zoological Record Volume 120]