Falcaustra washingtonensis n. sp (Nematoda: Kathlaniidae) from Ambystoma tigrinum melanostictum (Caudata: Ambystomatidae) from Washington State, USA

Falcaustra washingtonensis n. sp. (Nematoda: Kathlaniidae) from the intestine of the salamander Ambystoma tigrinum melanostictum is described and illustrated. Falcaustra washingtonensis n. sp. represents the 14th nearctic species assigned to this genus and is distinguished from other nearctic species by the distribution pattern of caudal papillae and number of posterior muscle groups of the male: 10 pairs of sessile caudal papillae-3 pairs precloacal, 1 pair adcloacal, 6 pairs postcloacal-and 5 posterior muscle groups.