Trypanoxyuris croizati n. sp. and T. callicebi Hugot & Vaucher, 1985 (Nematoda: Oxyuridae), two vicariant forms parasitic in Callicebus spp. (Primatia, Cebidae). Systematic Parasitology, 27(1), January 1994: 35-43. 36 [Zoological Record Volume 131]