A new species of Tereancistrum (Monogenea, Dactylogyridae) from the gills of three Leporinus species (Characiformes, Anostomidae) and a revised description of Tereancistrum parvus

Abstract

The present study describes Tereancistrum flabellum n. sp. (Dactylogyridae, Ancyrocephalinae) from the gills of the anostomid fishes Leporinus friderici, Leporinus amblyrhynchus and Leporinus elongatus from two freshwater ecosystems in the south east of Brazil. This new species is mainly characterized by the morphology of the copulatory complex (such as the MCO base formed by two fan-shaped structures, and accessory piece flattened, curved, rigid and channeled), a dorsal anchor with a well-developed superficial and inconspicuous deep root, and the shape of the accessory anchor sclerite with small spathulate termination. Tereancistrum flabellum n. sp. is the first record of a dactylogyrid from L. amblyrhynchus. The description of Tereancistrum parvus is also emended to correct and complement previous descriptions and the species is reported for the first time in Schizodon nasutus.

A new species of Tereancistrum (Monogenea: Dactylogyridae), parasite of Prochilodus lineatus (Characiformes: Prochilodontidae) from southeast Brazil

“…Except by Tereancistrum ornatus Kritsky, Thatcher & Kayton, 1980 reported in gills of Prochilodus reticulatus Valenciennes, 1850 from the Colombia, the other eight species were found in Brazil: Tereancistrum kerri Kritsky, Thatcher & Kayton, 1980 in Brycon melanopterus Cope, 1872; Tereancistrum parvus Kritsky, Thatcher & Kayton, 1980 in Leporinus fasciatus Bloch, 1794; Tereancistrum toksonum Lizama, Takemoto & Pavanelli, 2004;Tereancistrum curimba Lizama, Takemoto & Pavanelli, 2004; Tereancistrum pirassununguensis Cepeda, Ceccarelli & Luque, 2012 all in P. lineatus; Tereancistrum arcuatus Cohen, Kohn & Boeger, 2012 in Salminus brasiliensis Cuvier, 1816; Tereancistrum paranaensis Karling, Lopes, Takemoto & Pavanelli, 2014in Schizodon borellii Boulenger, 1900, and Tereancistrum flabellum Zago, Yamada, Franceschini et al, 2017 in Leporinus spp. (Kritsky et al, 1980;Lizama et al, 2004;Cepeda et al, 2012;Cohen et al, 2012;Karling et al, 2014;Zago et al, 2017).…”

Fauna parasitária de Leporinus friderici (characidae) oriundo do Rio Mazagão, Amazônia Oriental

“…Rio Mazagão, localizado no município de Mazagão-AP, possui em suas margens vegetação do tipo floresta de várzea e floresta de igapó, que são ambientes com papel relevante para populações de peixes, servindo como fonte de alimento e abrigo (ZACARDI, 2016). A bacia hidrográfica desse rio, abrange área de 2.538 km 2 , passando por diversos municípios do estado do Amapá (TAKIYAMA et al, 2007).…”

“…Três espécies da família Dactylogyridae foram encontradas nas brânquias de Leporinus macrocephalus no estado do Acre nas análisesde Martins (2017). Já no estudo deZago et al (2017), a prevalência em L. friderici por Tereancistrum flabellum Zago et al, 2017 foi de 15,5%, e prevalência de 8,65% em L. friderici estudado por…”

A new species of Urocleidoides Mizelle & Price, 1964 from the gills of Schizodon nasutus Kner, 1858 (Characiformes, Anostomidae) in southeastern Brazil

“…Monogeneans stand as the most diverse helminth parasites of freshwater fishes in South America and have been extensively studied in the Neotropical region (Eiras et al 2011;Cohen et al 2013;Luque et al 2017). The family Dactylogyridae Bychowsky, 1933 takes prominence and is known for its wide geographical distribution and by having a significant proportion of their species parasitising characiform fishes (Moreira et al 2015;Rossin and Timi 2016;Franceschini et al 2017;Acosta et al 2017Acosta et al , 2018Acosta et al , 2019Zago et al 2017Zago et al , 2018Zago et al , 2020Zago et al , 2021Oliveira et al 2021;Santos Neto and Domingues 2023;Yamada et al 2023). This family currently comprises over 150 genera (WoRMS 2023)mostly fish parasites on the gills, with others found in nasal cavities, in the mouth, on the body surface, and even in internal organs (Pavanelli et al 2013).…”

“…2017, 2018, 2019; Zago et al . 2017, 2018, 2020, 2021; Oliveira et al . 2021; Santos Neto and Domingues 2023; Yamada et al .…”