Abstract
Three species (2 new) of Urocleidoides are described and/or reported from the gills of Schizodon fasciatus and Laemolyta proxima (Anostomidae) from the Jari River in the eastern Brazilian Amazon. Urocleidoides jariensis n. sp. presents a sclerotized, tubular, spiral male copulatory organ (MCO) with one counterclockwise coil, a circular sclerotized tandem brim associated with the base of the MCO; a heavily sclerotized, funnel-shaped vaginal vestibule; and a broadly V-shaped ventral bar with anteromedial constriction and enlarged ends. Urocleidoides ramentacuminatus n. sp. has a sclerotized, tubular, spiral MCO with one counterclockwise coil; an accessory piece with a hook-shaped distal portion; and a dorsal anchor with a short, straight shaft; anchor point with ornamentation as sclerotized shredded filaments. Urocleidoides paradoxus is reported for the first time parasitizing S. fasciatus.
Highlights
Neotropical characiforms fish of the Anostomidae family have wide distribution in the watersheds ofSouth and Central America (Nelson et al, 2016)
Only 7.7% has been investigated for monogenoidean parasites
Copulatory complex comprising male copulatory organ (MCO) and accessory piece (Figure 1b); MCO sclerotized, tubular, spiral, counterclockwise, with one coil, 39 (28–49; n = 6) long; circular sclerotized tandem brim associated with base of MCO; proximal portion of MCO slightly expanded, distal aperture slightly acute
Summary
South and Central America (Nelson et al, 2016) This family currently comprises 14 genera and 155 species, many of which occur in the Amazon basin, with species of Schizodon Agassiz, 1829 and Laemolyta Cope, 1872 representing approximately 16% of the diversity (Nelson et al, 2016). Members of this family are important hosts for the life cycle of a broad diversity of parasites (Guidelli et al, 2006; Oliveira et al, 2017; Yamada et al, 2017), including platyhelminths belonging to the Class Monogenoidea (Cohen et al, 2013).
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