Two new nematode species, Orientatractis campechensis n. sp. and Orientatractis chiapasensis n. sp. (Atractidae, Cosmocercoidea), are described from the intestine of cichlid fishes collected in localities of southeastern Mexico and Nicaragua. These atractid nematodes are characterized by the presence of a cephalic end armed with 4 marked, Y-shaped, well-sclerotized pieces, consisting of 2 “horns” extending outward and downward and immediately below a single-horned structure. Both new species differ from the other 2 species of Orientatractis (Orientatractis leiperi and Orientatractis levanhoai) mainly in the body measurements, presence of a vulvar appendix, lengths of spicules and of the gubernaculum, distribution of caudal papillae, and the number of anterior sclerotized structures. Morphological and biometrical variations were evident among specimens from different hosts and localities, with the larger organisms being collected from Vieja bifasciata and Cichlasoma pearsei. Orientatractis campechensis and O. chiapasensis represent the first 2 species of this genus parasitizing freshwater fishes; the other species have been found in amphibians and reptiles.
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December 2004
SYSTEMATICS-PHYLOGENETICS|
December 01 2004
TWO NEW NEMATODE SPECIES, ORIENTATRACTIS CAMPECHENSIS N. SP. AND ORIENTATRACTIS CHIAPASENSIS N. SP. (NEMATODA: ATRACTIDAE) FROM CICHLID FISHES IN SOUTHERN MEXICO AND NICARAGUA
David González-Solís;
David González-Solís
Parasitología del Necton, El Colegio de la Frontera Sur (ECOSUR), Unidad Chetumal, Avenida Centenario Km. 5.5, C.P. 77900, A.P. 424, Chetumal, Quintana Roo, Mexico. [email protected]
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František Moravec
František Moravec
Parasitología del Necton, El Colegio de la Frontera Sur (ECOSUR), Unidad Chetumal, Avenida Centenario Km. 5.5, C.P. 77900, A.P. 424, Chetumal, Quintana Roo, Mexico. [email protected]
* Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic
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J Parasitol (2004) 90 (6): 1443–1449.
Citation
David González-Solís, František Moravec; TWO NEW NEMATODE SPECIES, ORIENTATRACTIS CAMPECHENSIS N. SP. AND ORIENTATRACTIS CHIAPASENSIS N. SP. (NEMATODA: ATRACTIDAE) FROM CICHLID FISHES IN SOUTHERN MEXICO AND NICARAGUA. J Parasitol 1 December 2004; 90 (6): 1443–1449. doi: https://doi.org/10.1645/GE-3366
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