Producción CyT
Congreso
Autoría
Lacerda, Gloria
;
AILAN CHOKE, LORENA GISELA
;
Cynthya E. Gonzaléz
;
Felipe B. Pereira
Fecha
2025
Editorial y Lugar de Edición
Asociación Argentina de Parasitología
Resumen
Información suministrada por el agente en
SIGEVA
Pharyngodon (Oxyuroidea, Pharyngodonidae) is a genus of nematodes that comprises 36 species, in which four occur in the Neotropics. In South America, Pharyngodon spp. are found mainly in lizards of the families Teiidae and Tropiduridae. These parasites are differentiated based on the tail structure of males, presence/absence of spines on the tail appendix of both sexes, egg shape and geographic distribution. Pharyngodon travassosi, one of the most common species infecting teiid lizards in Brazi...
Pharyngodon (Oxyuroidea, Pharyngodonidae) is a genus of nematodes that comprises 36 species, in which four occur in the Neotropics. In South America, Pharyngodon spp. are found mainly in lizards of the families Teiidae and Tropiduridae. These parasites are differentiated based on the tail structure of males, presence/absence of spines on the tail appendix of both sexes, egg shape and geographic distribution. Pharyngodon travassosi, one of the most common species infecting teiid lizards in Brazil and Argentina, is poorly and inaccurately described, representing a taxonomic challenge. This work aimed to evaluate the conspecificity among specimens of P. travassosi collected in Ameiva ameiva from the Chapada do Araripe (Ceará, Brazil) and Ingeniero Juarez (Formosa, Argentina), and in Teius teyou from Ingeniero Juarez. Nematodes (4 females and 5 males from T. teyou; 1 male and 6 females from Argentinian A. ameiva, and 6 males and 5 femalesfrom Brazilian A. ameiva) were observed using light microscopy and 2 specimens from each component population weregenetically characterized based on COI mtDNA sequences. A phylogeny was reconstructed based on Bayesian inferenceand species delimitation methods (PTP, ASAP) were performed. No morphological differences were observed amongthe specimens from the different host species and geographic origins. In the phylogeny, the present samples formeda monophyletic assemblage and were nested according to geographic origin. The species delimitation results indicatedconspecificity between samples from Argentina only. In this sense, considering the specimens analyzed, a cryptic speciationin P. travassosi cannot be discarded, in which geographic isolation may be the force responsible for this process. This studyprovides the first genetic characterization for the genus Pharyngodon. Further genetic analyses based on 18S and 28SrDNA will be performed to provide additional evidences for the present results
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SQUAMATATEIIDAEARGENTINABRAZILINTEGRATIVE TAXONOM