Six species of nematode in the genus Abbreviata were recovered from the stomachs of 58 Varanus
gouldii, s.l., in Western Australia: A. hastaspicula, A. barrowi, A, antarctica, A. levicauda, sp. nov.,
A. tumidocapitis, sp. nov., and an unnamed species. A. occidentalis Jones, 1978 is reduced to
synonomy with A. antarctica (Linstow, 1899). A, hastaspicula was recovered from all hosts examined
except those from the south-west of the State, where it was replaced by A. antarctica. A. levicauda
and A. tumidocapitis occurred concurrently with one or both of the above species. Th'e increase in
A. hastaspicula numbers with host size in V. gouldii, s.s., (P<0,05) and in V. panoptes (P<0,05)
indicates that there is no effective host immune response. A. hastaspicula numbers were unaffected
by concurrent A. levicauda infection. There was a positive correlation between numbers of Abbreviata
sp. larvae and A. hastaspicula (P<0.01), and between Abbreviata sp. larvae and A. antarctica (P<0.01),
in V. gouldii, s.s. No larvae were seen in the stomach wall of these Varanus, and it is concluded that
those which occur commonly in this situation in elapid snakes are probably larvae of A. hastaspicula
or A. levicauda, which appear to be unable to mature in these hosts.