A new species of Wallinia Pearse, 1920 (Digenea: Allocreadiidae), in Astyanax bimaculatus (Linnaeus, 1758) (Characidae) in Northeast Brazil, based on morphology and DNA sequences.

Autor: da Silva BAF; Laboratório de Ecologia Parasitária (LABEP), Departamento de Biologia, Universidade Regional do Cariri (URCA) - Campus Pimenta, Pimenta, Crato, Ceará, 63105-000, Brazil. brunoskarllet2@gmail.com., Dias KGA; Laboratório de Parasitologia de Animais Silvestres (LAPAS), Setor de Parasitologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista 'Júlio de Mesquita Filho' (UNESP), Campus Botucatu, Botucatu, São Paulo, Brazil., da Silva RJ; Laboratório de Parasitologia de Animais Silvestres (LAPAS), Setor de Parasitologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista 'Júlio de Mesquita Filho' (UNESP), Campus Botucatu, Botucatu, São Paulo, Brazil., Yamada FH; Laboratório de Ecologia Parasitária (LABEP), Departamento de Biologia, Universidade Regional do Cariri (URCA) - Campus Pimenta, Pimenta, Crato, Ceará, 63105-000, Brazil.
Jazyk: angličtina
Zdroj: Parasitology research [Parasitol Res] 2021 Jan; Vol. 120 (1), pp. 37-44. Date of Electronic Publication: 2020 Nov 25.
DOI: 10.1007/s00436-020-06948-1
Abstrakt: Wallinia caririensis n. sp. is described from the intestine of Astyanax bimaculatus (Linnaeus, 1758) (Characidae) collected in the Batateiras River in the municipality of Crato, Ceará state, Brazil. The description was based on integrative taxonomy approach using DNA sequences from the D1-D3 domains of the 28S rDNA gene. The new species was confirmed through the phylogenetic analysis of the 28S rDNA gene, which showed that Wallinia caririensis n. sp. is a sister taxon of Wallinia brasiliensis (Dias, Müller, Almeida, Silva, Azevedo, Pérez-Ponce de León, and Abdallah, 2018, and Wallinia anindoi Hernández-Mena, Pinacho-Pinacho, García-Varela, Mendonza-Garfias, and Pérez-Ponce de León, 2019), a species which parasitizes Astyanax fasciatus (Cuvier, 1819), A. lacustris (Lucena and Soares, 2016) in Brazil, and A. aeneus (Günther, 1860) in Mexico, with genetic divergences of 2% and 3%, respectively. The new species can be distinguished morphologically from its congeners by possessing large body size (length and width) and tapered extremity in the posterior end of the body, eyespots are present at the pharynx level, and vitelline follicles reach up to the half distance between the posterior testis and the extremity of the body, by having larger testes distributed in coincident zones (i.e., contiguous) and non-operculated eggs (a conspicuous characteristic in W. brasiliensis). To date, species of this genus have already been described in freshwater fishes from Mexico, Costa Rica, Venezuela, and Southeastern Brazil. The species described in this study consists of the second species parasitizing characids in Brazil, and the first record in Northeastern Brazil. This finding fills a gap and expands the biogeographic distribution of the genus Wallinia in South America.
Databáze: MEDLINE
Externí odkaz: