Abstract
This paper describes a new species of Kritskyia, K. eirasi n. sp., from the urinary bladder and ureters of Leporinus lacustris, “corró”, an anostomid fish collected in the Upper Paraná River floodplain, Brazil. The new species was included in this genus because of the infection site, the absence of anchor, bar and 4A hooks and the sinistral vaginal aperture. It differs from the type species, K. moraveci and from the other known species of the genus, mainly by the shape of the copulatory complex. The accessory piece is distally complex, serving as a cirrus guide. The base of male copulatory organ, like in congeneric species, is adorned with a sclerotized fringe; however K. eirasi n. sp. presents an elongate projection of this fringe. It also differs from K. boegeri because of the lacking of sclerotized disk in vaginal aperture; and from K. annakohnae due to the absence of keel-like projection in the body's left margin.
Highlights
The majority of the monogenean species are parasites of gills, nasal fossae and skin of fishes
The genus Kritskyia was proposed by Kohn (1990) to accommodate species lacking anchors, bars and 4A hooks, with accessory piece bipartite, male copulatory orga’n non-articulated with accessory
Eighty-four specimens of Leporinus lacustris were caught with aid of gill nets in lagoons, rivers, channel and glade from Upper Paraná River floodplain (22o50’ – 22o70’S and 53o15’ – 53o40’W), Southern Brazil
Summary
The majority of the monogenean species are parasites of gills, nasal fossae and skin of fishes. Three species from the genus Kritskyia were described until now in fishes from Southern Brazil: Acta Scientiarum. The genus Kritskyia was proposed by Kohn (1990) to accommodate species lacking anchors, bars and 4A hooks, with accessory piece bipartite, male copulatory orga’n non-articulated with accessory. Type species of this genus, was redescribed by Kritsky et al (1996), who considered the accessory piece unipartite and sheathlike and did not confirm the tandem disposition of the gonads. Boeger et al (2001) related overlapping gonads in K. annakhonae and suggested that this may occur in type species. It may occur in other species of the genus.
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