Abstract
Two new species of physalopterid nematodes are described from a skink (Scincidae) and a gecko (Gekkonidae) from the West Australian desert. Kreisiella chrysocampa gen. et sp. nov. (Spirurida: Physaloperidae) from Egernia inornata is characterized by the possession of a row of straight parallel denticles along the medial pseudolabial margins, male caudal alae unsupported by papillae, a truncated female tail and an anteriorly-placed vulva. The original female specimen of Physaloptera heterocephala Kreis, 1940 is transferred to this genus. In Physalopteroides filicauda sp. nov. (Physalopteridae) from Nephrurus laevissimus the external apical tooth present in immature worms is represented in adults by a knob-like structure, larger on the left pseudolabium. Both sexes possess a long slender tail terminating in a small knob. The spicules are markedly dissimilar and the vulva is surrounded anteriorly and posteriorly by horizontal rows of tubercules.
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