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(es)

da Silva, Bruno Anderson Fernandes ^[1] ; Dias, Karina Gabriele Alves ^[2] ; da Silva, Reinaldo Jose ^[2] ; Yamada, Fabio Hideki ^[1]

Afiliação do(s) autor(es)

^[1] Univ Reg Cariri URCA, Dept Biol, Lab Ecol Parasitaria LABEP, Campus Pimenta, BR-63105000 Crato, Ceara - Brazil

^[2] Univ Estadual Paulista Julio Mesquita Filho UNESP, Inst Biociencias Botucatu, Setor Parasitol, Lab Parasitol Anim Silvestres LAPAS, Campus Botucatu, Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Parasitology Research; v. 120, n. 1 NOV 2020.
• Citações Web of Science: 1

Resumo

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, Ceara 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, Muller, Almeida, Silva, Azevedo, Perez-Ponce de Leon, and Abdallah, 2018, and Wallinia anindoi Hernandez-Mena, Pinacho-Pinacho, Garcia-Varela, Mendonza-Garfias, and Perez-Ponce de Leon, 2019), a species which parasitizes Astyanax fasciatus (Cuvier, 1819), A. lacustris (Lucena and Soares, 2016) in Brazil, and A. aeneus (Gunther, 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. (AU)

• Processo FAPESP: 16/50377-1 - Taxonomia morfológica e molecular de helmintos parasitas de animais ectotérmicos no Brasil
• Beneficiário: Reinaldo José da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular