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

Abstract

Demidospermus paranaensis sp. nov. is described from the gills of Loricariichthys platymetopon Isbrücker et Nijssen (Loricariidae, Siluriformes) from the Upper Paraná River floodplain, Brazil. This new species differs from other members of Demidospermus in the following features: tegument with annulations throughout trunk and peduncle, eyes absent, longer male copulatory organ (MCO) with ovate base. Demidospermus paranaensis sp. nov. is similar to its congenerics by having tandem gonads, a counterclockwise-coiled MCO, non-articulated groove-like accessory piece serving as a MCO guide, sinistral vaginal aperture, and V-shaped haptoral bars.

Morphology and molecular characterization of Demidospermus spirophallus n. sp., D. prolixus n. sp. (Monogenea: Dactylogyridae) and a redescription of D. anus in siluriform catfish from Brazil

“…sp., was included in this genus based on agreement with the amended generic characteristics of the diagnosis presented by Kritsky & Gutiérrez (1998), previously cited. The morphology of the copulatory complex of this new species is very similar to that of D. paranaensis described by Ferrari-Hoeinghaus et al (2010) from L. platymetopon , as the presence of a longer, counterclockwise-coiled MCO, with an ovate base and non-articulated groove-like accessory piece serving as a MCO guide. However, the MCO and the accessory piece are more robust and larger than those observed in D. paranaensis .…”

“…Ferrari-Hoeinghaus et al . (2010) described the species D. paranaensis from L. platymetopon collected in the Upper Paraná River floodplain, which is the same reservoir and the same host species from which the specimens of D. anus analysed in the present study were collected. In another study, Cohen & Kohn (2008) reported, for the first time, the occurrence of D. anus in L. platymetopon from the reservoir of the Itaipu Hydroelectric Power Station, Brazil.…”

“…Ferrari-Hoeinghaus et al . (2010) considered that D. paranaensis differed from D. anus mainly based on the presence of annulations in the tegument (present in D. paranaensis and not described in D. anus ), the size of the haptoral pieces and the morphology of the MCO. However, analysing the paratypes of D. paranaensis deposited in the CHIOC and the specimens analysed by Cohen & Kohn (2008) described as D. anus , no differences were found between the morphology and measurements of the specimens.…”

“…The loricariid recorded as hosts to Demidospermus spp. are L. anus (= Loricaria anus ), which was reported as a host to the type species D. anus (Suriano, 1983); L. platymetopon , a host of D. paranaensis (Ferrari-Hoeinghaus et al , 2010) and D. anus (Cohen & Kohn, 2008); Loricariichthys castaneus (Castelnau, 1855), parasitized with Demidospermus sp. (Azevedo et al ., 2010), and L. prolixa , a host of the two new species described in this study.…”

Checklist of parasites in fish from the upper Paraná River floodplain: An update

“…The parasite fauna of fish from the upper Paraná River floodplain were previously detailed by Pavanelli et al (1997), Takemoto et al (2009) and further studies that reported taxonomic descriptions of new species, such as Ferrari-Hoeinghaus et al (2010), Tavernari et al (2010), Karling et al (2011Karling et al ( , 2014. Over the last decade, studies recorded in this area have indicated an increase in the diversity of fish parasites, so the purpose of this study was to provide an updated list of parasites and their respective fish hosts in the upper Paraná River floodplain.…”