New Species and Geographical Records of Dactylogyrids (Monogenea) of Catfish (Siluriformes) from the Peruvian Amazonia

Abstract

Three new species of gill monogeneans (Dactylogyridae: Ancyrocephalinae) are described from siluriform catfish from Iquitos, Peru: Demidospermus mortenthaleri n. sp. from Brachyplatystoma juruense (Boulenger), Demidospermus brevicirrus n. sp. from Pimelodus sp., and Aphanoblastella aurorae n. sp. from Goeldiella eques (Müller & Troschel). Demidospermus mortenthaleri is characterized by a male copulatory organ (MCO) with a small loop at its middle portion; 2 types of hooks, of which pairs 5 and 6 are longer than the remaining hooks; a proximal subunit round and highly depressed thumb; and a sclerotized vagina with a round pad at the vaginal aperture. Demidospermus brevicirrus is distinguished from other congeners by the presence of a short, straight, and robust MCO and boot-shaped accessory piece with a hooked projection directed posteriorly. Aphanoblastella aurorae is the only species of the genus that possesses an arrow-shaped sclerotized vagina and a medial process on the dorsal bar. Another 6 dactylogyrids described previously are recorded for the first time from the Peruvian Amazonia: Cosmetocleithrum bulbocirrus Kritsky, Thatcher and Boeger, 1986 ; Vancleaveus fungulus Kritsky, Thatcher and Boeger, 1986 ; V. janauacaensis Kritsky, Thatcher and Boeger, 1986 ; V. platyrhynchi Kritsky, Thatcher and Boeger, 1986 ; Unilatus unilatus Mizelle and Kritsky, 1967 ; and U. brittani Mizelle, Kritsky and Crane, 1968 . Based on observations of specimens collected in the Peruvian Amazonia, new morphological data for these species are provided. Comparison of new specimens of U. unilatus and U. brittani with those of Unilatus brevispinus Suriano, 1985 and Unilatus longispinus Suriano, 1985 , both originally described from Brazil, has shown that they are conspecific. Therefore, the latter species were synonymized with U. unilatus and U. brittani , respectively. In addition, 56 undescribed monogeneans found in catfish from the Peruvian Amazonia, some of them probably belonging to new genera, are listed.

A new species of Unilatus (Platyhelminthes: Monogenoidea) from the gills of Leporacanthicus galaxias Isbrücker et Nijssen (Siluriformes: Loricariidae) from Brazil

“…5). Mendoza-Palmero et al (2012) reported the presence of expanded shank and highly reduced thumb of hooks of pair 7 for specimens of U. brittani from Pterygoplichthys anisits (Mendoza-Palmero et al 2012: Fig. 46).…”

Haematological and parasitological assessment of silver catfish Rhamdia quelen farmed in Southern Brazil

“…Some specimens were mounted in Hoyer's medium for sclerotized structures observation, while others were stained with Gomori trichrome in order to study the internal structures. The parasites were identified according to Suriano et al (1986), Kritsky et al (2000), Mendoza-Franco et al (2007), Carvalho et al (2009) andMendoza-Palmero et al (2012).…”

Ecto- and endo-parasitic monogeneans (Platyhelminthes) on cultured freshwater exotic fish species in the state of Morelos, South-Central Mexico

“…The present study provides two new monogenean records for Mexico, Gyrodactylidae sp. and Unilatusunilatus , the latter belonging to the Dactylogyridae which was previously reported on the snow pleco P.anisitsi Eigenmann and Kennedy and on Plecostomus sp., from Brazil and Peru, respectively (Mendoza-Palmero et al 2012). …”

“…In addition, some specimens were mounted in a mixture of lactic-acid (LA) and glycerin- ammonium picrate (GAP) and then remounted in Canada balsam as permanent preparations (Mendoza-Franco et al 2013). Parasite identifications were made using a Leica microscope DM2500 with Nomarski interference contrast and based on descriptions provided in the following references: García-Vásquez et al 2007, 2015, Jogunoori et al 2004, Kritsky et al 1989, Lim 1996, Mendoza-Palmero et al 2012, Pariselle and Euzet 1995, Yamaguti 1963. Reference specimens were deposited in the National Helminthological Collection of Mexico ( CNHE ).…”