New data on species of Demidospermus (Dactylogyridae: Monogenea) parasitizing fishes from the reservoir of the Itaipu Hydroelectric Power Station, Parana State, Brazil, with new synonymies

Abstract

RESUMO Oito espécies deSpecies of Demidospermus have been described from siluriform hosts from Argentina and more recently, from Brazil, indicating the specificity of the genus with the fish order. In the present paper, we found eight species of Demidospermus parasitizing different host genera belonging to the families Pimelodidae, Heptapteridae, Loricariidae and Auchenipteridae.The genus Demidospermus is characterized by having tandem gonads; counterclock-wise coiled male copulatory organ; sinistral vaginal aperture; U,W or V shaped haptoral bars; subspherical eye granules and a sheathlike accessory piece serving as a guide for the MCO (KRITSKY; GUTIÉRREZ, 1998). Up to now, fourteen species of the genus were described from eight different species of siluriform fishes. RESEARCH NOTE NEW DATA ON SPECIES OF Demidospermus (DACTYLOGYRIDAE: MONOGE-NEA) PARASITIZING FISHES FROM THE RESERVOIR OF THE ITAIPU HYDROELECTRIC POWER STATION, PARANA STATE, BRAZIL, WITH NEW SYNONYMIES

A new species of Demidospermus Suriano, 1983 (Monogenea, Dactylogyridae) parasitic on Loricariichthys platymetopon Isbrücker et Nijssen (Loricariidae, Siluriformes) from the Upper Paraná River floodplain, Brazil

“…Among monogeneans, twelve species of Demidospermus have been identified in South America, mainly in Argentina Cohen 1998, Cohen andKohn 2008a): Demidospermus anus Suriano,1983, Kritsky et Gutiérrez, 1998. Cohen andKohn (2008b) also reported for the first time D. anus in Loricariichthys platymetopon from Itaipu Reservoir. The new Demidospermus species described herein is parasitic on the armoured catfish L. platymetopon, locally known as "cascudo-chinelo", which is closely related to Loricariichthys anus, the host from which the genus Demidospermus was proposed *Corresponding author: apfhoeinghaus@yahoo.com.br (Suriano 1983), but this new species differs from D. anus in some aspects as described below.…”

Helminth fauna parasitizing Pimelodus pohli (Actinopterygii: Pimelodidae) from the upper São Francisco River, Brazil

“…Studies on parasitism in pimelodids have been also conducted in other localities of Brazil, such as some helminth parasites of species of Pimelodus Lacepède, 1803: P. blochii Valenciennes, 1840in Paraná River (KOHN et al, 1997; P. fur (Lütken, 1874) in Paraná River ; P. maculatus in Amazon Basin in Guaiba River (KOHN;FRÓES, 1986;FORTES et al, 1993;SARMENTO et al, 1995); in Guandu River (SANTOS et al, 2007;ALBUQUERQUE et al, 2008;AZEVEDO et al, 2010); in Itajaí-Açu River (BACHMANN et al, 2007); in Mogi Guaçu River (TRAVASSOS; KOHN, 1965;KOHN et al, 1985;FERNANDES, 1987;AGUIAR et al, 2011); in Paraiba do Sul River (VENANCIO et al, 2010); in Paraná River (TRAVASSOS; KOHN, 1965;MACHADO DOS SANTOS, 1992;MORAVEC et al, 1993MORAVEC et al, , 1997KOHN et al, 1997;PAVANELLI, 2004;KOHN, 2008;KOHN et al, 2011;LOPES et al, 2011); in Paranapanema River (RAMOS et al, 2013); Pimelodus microstoma Steindachner, 1877 in Mogi Guaçu River (AGUIAR et al, 2011) [note of the authors: this fish species was cited by the authors as P. heraldoi Azpelicueta, 2001, that is a junior synonym of P. microstoma Stein., sensu Ribeiro and Lucena (2010) KOHN, 2001;KOHN et al, 2011); Pimelodus sp. in Amazon Basin (VICENTE et al, 1978).…”

Type material of Platyhelminthes (Monogenoidea) housed in the Helminthological Collection of the Oswaldo Cruz Institute/ FIOCRUZ (CHIOC), Rio de Janeiro, Brazil, from 1979 to 2016

“…Some authors considered the species to be a synonym of Demidospermus leptosynophallus Kritsky & Gutiérrez, 1998 (Cohen and Kohn 2008a, Monteiro et al 2010a). Takemoto et al (2009) referred to it as Demidospermus mandi .…”