Philocorydoras longus sp. n. (Monogenea, Dactylogyridae) from the gills of Hoplosternum littorale (Siluriformes, Callichthyidae) in Southeastern Brazil and the reassignment of two species from the genus Urocleidoides to Philocorydoras

Abstract

SummaryPhilocorydoras longus sp. n. (Dactylogryridae) is described from the gills of the freshwater fi sh Hoplosternum littorale (Hancock, 1828) (Callichthyidae) from Jurumirim reservoir, Upper Paranapanema River, São Paulo State, Brazil. This new species belongs to the genus Philocorydoras mainly by possessing a curved cirrus accompanied by an accessory piece attached by a conspicuous fi lament. Philocorydoras longus sp. n. most resembles P. platensis, but differs by having delicate and smaller hooks, grooves in ventral and dorsal anchors, larger cirrus and accessory piece, and ventral bar with a long postero-medial process. Two species of the genus Urocleidoides (U. corydori Molnar, Hanek et Fernando, 1974 and U. margolisi Molnar, Hanek et Fernando, 1974) originally described from the gills of Corydoras aeneus (Gill, 1858) from Talparo River, Trinidad (near Brazil), were transferred to the genus Philocorydoras mostly by the absence of a sinistral vaginal sclerite (i. e., the primary characters of Urocleidoides) and counterclockwise cirral rings (i.e., curved tube, and tapered anteriorly in Philocorydoras). The new species is the fourth species assigned to the genus and the fi rst recorded for Brazil.

New species of Urocleidoides (Monogenoidea: Dactylogyridae) from the gills of two species of Anostomidae from the Brazilian Amazon

“…Some species of Urocleidoides have been described and posteriorly relocated to other genera: Demidospermus lebedevi (Kritsky & Thatcher, 1976); Diaphorocleidus affinis (Mizelle, Kritsky & Crane, 1968); Diaphorocleidus kabatai (Molnar, Hanek & Fernando, 1974); Diaphorocleidus microstomus (Mizelle, Kritsky & Crane, 1968); Philocorydoras corydori (Molnar, Hanek & Fernando, 1974); Philocorydori margolisi (Molnar, Hanek & Fernando, 1974); Palombitrema heteroancistrium (Price & Bussing, 1968); Characithecium costaricensis (Price & Bussing, 1967) and Nanayella megorchis (Mizelle & Kritsky, 1969) (Price & Bussing, 1968;Kritsky et al, 2000;Jogunoori et al, 2004;Mendoza-Franco et al, 2009;Yamada et al, 2015;Acosta et al, 2019), due to the absence of morphological characters (i.e., presence of vaginal sclerite, MCO rolled counterclockwise, hook pair 1 and 5 reduced) that define this genus.…”

Integrative taxonomy ofUrocleidoidesspp. (Monogenoidea: Dactylogyridae) parasites of characiform and gymnotiform fishes from the coastal drainages of the Eastern Amazon, Brazil

“…Prior to the present study, from the species of Urocleidoides previously considered incertae sedis by Kritsky et al (1986), 14 have been synonymized or relocated into other genera as follows: Palombitrema Price & Bussing, 1968 (1 species); Demidospermus Suriano, 1983 (1 species); Philocorydoras Suriano, 1986 (2 species); Sciadicleithrum Kritsky, Thatcher & Boeger, 1989 (1 species); Ameloblastella (2 species), Aphanoblastella (2 species), Diaphorocleidus Jogunoori, Kritsky & Venkatanarasaiah, 2004(3 species), Characithecium Mendoza-Franco, Reina & Torchin, 2009 (1 species); Nanayella Acosta et al, 2019 (1 species) (Price & Bussing 1968;Kritsky et al 1989;Kritsky et al 2000;Mendoza-Franco et al 2003;Jogunoori et al 2004;Mendoza-Franco et al 2009;Mendoza-Palmero & Scholz 2011;Yamada et al 2015;Acosta et al 2019). However, even though the correct taxonomic status of several species has been established, nine are still considered incertae sedisnamely, Urocleidoides stictus Mizelle, Kritsky & Crane, 1968, Urocleidoides strombicirrus (Price & Bussing, 1967) Thatcher, 1974, andUrocleidoides trinidadensis Molnar, Hanek &Fernando, 1974 reported from the gills of Characiformes; Urocleidoides gymnotus, Urocleidoides carapus, Urocleidoides virescens Mizelle, Kritsky & Crane, 1968, and Urocleidoides advenai found in the gills of Gymnotiformes; and Urocleidoides amazonensis Mizelle & Kritsky, 1969 and Urocleidoides catus Mizelle & Kritsky, 1969 from the gills of Siluriformes.…”

Three new species of Urocleidoides (Monogenoidea: Dactylogyridae) parasitizing characiforms (Actinopterygii: Characiformes) in Tocantins River, states of Tocantins and Maranhão, and new record for U. triangulus in Guandu River, state of Rio de Janeiro, Brazil

“…Although species of Urocleidoides have a wide distribution in the tropics, there are still few studies documenting the diversity of Monogenoidea in the Neotropical Region, considering the great biodiversity of host species. Among the species that were considered incertae sedis, eight remain uncertain and 16 have been allocated to other genera (Kritsky et al 1986, 1989, 2000, Jogunoori et al 2004, Mendoza-Franco et al 2009, Yamada et al 2015, Acosta et al 2019.…”