Systematic revision of the Atractidae sensu Chabaud (1978) (Nematoda; Cosmocercoidea): Maracaya belemensis n. sp. and Aplectana albae n. sp. from Amphisbaena alba in Brazil. Canadian Journal of Zoology, 66(8) 1988: 1857-1864. 1857 [Zoological Record Volume 125]