Producción CyT
Congreso
Autoría
Carmo, Gustavo Macêdo
;
AILAN CHOKE, LORENA GISELA
;
Jerdy, Hassan
;
Felipe B. Pereira
Fecha
2025
Editorial y Lugar de Edición
Asociación Argentina de Parasitología
Resumen
Información suministrada por el agente en
SIGEVA
The genus Toxocara comprises 27 valid species of nematodes that parasitize a great diversity of mammals. Most congeners do not have zoonotic potential, which includes Toxocara alienata that infects Nasua nasua, Nasua rufa, Procyon cancrivorus (Procyonidae) and Pecari tajacu (Tayassuidae) in South America. Although the morphology of this species has been well investigated, there is no genetic information related to it. In this sense, the present work aimed to performa morphological and genetic c...
The genus Toxocara comprises 27 valid species of nematodes that parasitize a great diversity of mammals. Most congeners do not have zoonotic potential, which includes Toxocara alienata that infects Nasua nasua, Nasua rufa, Procyon cancrivorus (Procyonidae) and Pecari tajacu (Tayassuidae) in South America. Although the morphology of this species has been well investigated, there is no genetic information related to it. In this sense, the present work aimed to performa morphological and genetic characterization of T. alienata collected in P. cancrivorus from the Brazilian Amazon (State of Pará). Nematodes were observed using light and scanning electron microscopy; and genetically characterized based on COI mtDNA barcode sequence. A phylogeny was reconstructed using on Bayesian inference and species delimitation methods (PTP, bPTP, ASAP) were performed. Specimens were identified as T. alienata based on: esophagus with ventriculus and without appendix, absence of intestinal cecum, dentigerous ridges on the 3 lips, presence of cervical alae; males with equal, alate spicules shorter than 1mm and 28 pairs of caudal papillae; and females with preequatorial vulva. The presence of an unpaired cloacal papilla on the border of the anterior cloacal lip is described for the first time in the species. The COI mtDNA sequence showed high genetic divergence when compared to those of Toxocara cati, Toxocara apodemi, Toxocara vitulorum and Toxocara malaysiensis (p = 0.24). In contrast, sequences of Toxocara canis were less divergent in relation to that of the present sample (p=0.14). In the phylogeny, T. alienata represented an independent lineage, sister to a group composed by sequences of T. canis. The species delimitation methods validated T. alienata as a specific entityand different from the closely related T. canis. This is the first genetic characterization for T. alienata, thus contributing for further studies on the identification and systematics of Toxocarinae nematodes
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Palabras Clave
HELMINTHProcyon cancrivorusBRAZILAMAZONGENETICS