Data/hora: 02/06/2024 02:19:51

Provedor de dados: | 42
País: | Brazil
Título: | Rhinoxenus (Dactylogyridae) parasitizing piranhas (Serrasalmidae) at its southernmost limit of distribution (Paraná River, Argentina), with the description of two new species
Autores: | ROSSIN,MARÍA A.; FRANCESCO,PABLO N. DE; IRIGOITIA,MANUEL M.; SCARABOTTI,PABLO A.; TAGLIORETTI,VERÓNICA; TIMI,JUAN T.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Piranhas; Nasal parasites; Rhinoxenus spp; South American rivers.
Resumo: | Abstract Abstract: Three piranha species, Serrasalmus maculatus, S. marginatus and Pygocentrus nattereri, living sympatrically in the lower Paraná River (Argentina) were examined searching for nasal monogeneans to know its diversity and distribution. Four species of monogeneans belonging to Rhinoxenus were found parasitizing the nasal cavities. Two new species are described, and new morphological data of 2 previously described species is provided. Rhinoxenus argentinensis n. sp. is characterized by having the male copulatory organ (MCO) as a coiled tube with a reel shaped-base; an elongated accessory piece articulated to base of MCO; a sinistral vagina with a sclerotized vestibule, and a sclerotized cap of the ventral anchor laterally modified forming a triangular expansion. Rhinoxenus paranaensis n. sp. is characterized by having a MCO as a coiled tube with a reel-shaped base; an accessory piece with an elongate proximal portion, a dilated distal portion with digitiform projections articulated to base of MCO; a sinistral vagina with 5-6 cuticular spine-shaped processes, and a sclerotized cap of the ventral anchor modified laterally forming a bilobate expansion. Additionally, multivariate discriminant analyses showed significant morphometric differences in the ventral anchors among Rhinoxenus species parasitizing ‘piranhas ’.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700621
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/0001-3765201920190711
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.91 n.4 2019
Fonte: | info:eu-repo/semantics/openAccess