Falcaustra odaiensis n. sp. (Nematoda: Cosmocercoidea: Kathlaniidae) is described from the Japanese clawed salamander, Onychodactylus japonicus (Houttuyn, 1782), and Ishizuchi salamander, Hynobius hirosei Lantz, 1931 (Caudata: Hynobiidae), in Japan. This nematode is characterized by having multiple pseudosuckers in the male. It resembles Falcaustra araxiana, Falcaustra duyagi, Falcaustra lambdiensis, Falcaustra pillaii, Falcaustra siamensis, and Falcaustra washingtonensis, but is readily distinguished by the spicule length and/or egg size. This is the first Falcaustra species described from Japanese salamanders.

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