Physaloptera nordestina n. sp. (Nematoda: Physalopteridae) parasitizing snakes from Northeastern Brazil.

Physaloptera nordestina n. sp. (Nematoda: Physalopteridae) is described from the stomach of the snakes Oxybelis aeneus (Wagler), Pseudoboa nigra (Duméril, Bibron Duméril) and Xenodon merremii (Wagler) (Squamata: Snakes), collected in northeastern Brazil. The new species has males with ornamented caudal alae connected ventrally, anterior to the cloaca, 21 caudal papillae, including four pedunculated and 13 sessile pairs (six surrounding the cloaca and three at tail), spicules sub-equal in size and with different shape. In addition, the females have the vulva located on the anterior third of the body and two to four uterine branches. Here we present the ninth species of Physaloptera that parasitizes reptiles from Brazil.