Lent, H.; Santos, C.P. (1989). Acanthocephalus ula n. sp. (Acanthocephala, Echinorhynchidae) and Schulzia usu n. sp. (Nematoda, Molineidae) described from Atelopus oxyrhynchus (Amphibia) from Venezuela. Revista Brasileira de Biologia. 49: 1085–1091.
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Lent, H.; Santos, C.P.
1989
Acanthocephalus ula n. sp. (Acanthocephala, Echinorhynchidae) and Schulzia usu n. sp. (Nematoda, Molineidae) described from Atelopus oxyrhynchus (Amphibia) from Venezuela.