A new species of Kritskyia (Monogenea, Dactylogyridae) parasitic in the urinary bladder of Salminus brasiliensis (Characiformes) from the Pantanal wetlands, Brazil

Abstract

A new species of Kritskyia Kohn, 1990 (Monogenea, Dactylogyridae, Ancyrocephalinae) is described from the urinary bladder of Salminus brasiliensis (Cuvier, 1816) (Characiformes, Characidae) from the Cuiabá River, the Pantanal wetlands, Brazil. The male copulatory apparatus of the new species differs from those of other species of the genus by the presence of a bipartite accessory piece (distally and proximally linked), one part grooved, serving as guide for distal portion of the MCO. Moreover, the vagina of the new species differs from those of congeners by possessing distal digitiform processes.

New species of Paracolpenteron n. gen. and Ancyrocephalus (Monogenea, Dactylogyridae) inhabiting the urinary bladder and gills of the Maya needlefish Strongylura hubbsi (Beloniformes, Belonidae) from Chiapas, Mexico

“…differs from other dactylogyrids (see genera listed above) in having a dextroventral vaginal aperture (lacking vagina in Anacanthorus ; vagina sinistral in Anacanthoroides , Kritskyia , Pavanelliella and Telethecium ); overlapping gonads (tandem in Anacanthorus and slightly overlapping in Octouncuhaptor ); an unarticulated MCO to accessory piece (articulated in Octouncuhaptor and Telethecium ); and by lacking a uterus with well-developed metraderm and “larval hooks” 4A’s (present in species of Anacanthorus ; as hooks “reduced” in Anacanthoroides ); pronounced cephalic lappets and germarium loops around the right limb of the intestine (present in Anonchohaptor ); and a hook-like MCO and V or U-shaped sclerite associated with hooks (present in Anonchohaptor and Icelanonchohaptor ) (see [1, 2, 4, 6, 11, 14, 18, 19, 23, 26]).…”

Enterogyrus spp. (Monogenea: Ancyrocephalinae) and Aeromonas jandaei co‐infection associated with high mortality following transport stress in cultured Nile tilapia

“…The Monogenea are among the main parasites affecting aquaculture worldwide. Monogeneans are generally considered ectoparasites since they mainly affect gills and the external surface of fish (Kearn, 2011), however, this large group is also composed of endoparasites that affect the aquatic organisms’ internal organs and systems, such as the urinary tract (Cepeda et al., 2011; Kohn, 1990), stomach (Bilong‐Bilong et al., 1996; Jerônimo et al., 2010; Luus‐Powell et al., 2020; Pariselle et al., 1991), intestine (Paperna, 1963) and blood system (Llewellyn, 1960).…”

Mass mortality of Nile tilapia caused by co-infection with Enterogyrus spp. (Monogenea: Ancyrocephalinae) and Aeromonas jandaei following transport stress

“…The Monogenea are among the main parasites affecting aquaculture worldwide. Monogenea are generally considered ectoparasites since they mainly affect gills and the external surface of fish (Kearn, 2011), however, this large group is also composed of endoparasites that affect the aquatic organisms' internal organs, such as the urinary tract (Kohn, 1990;Cepeda et al, 2011), stomach (Pariselle et al, 1991;Bilong-Bilong et al, 1996;Jeronimo et al, 2010;Luus-Powell et al, 2020), and intestine (Paperna, 1963).…”