BioOne Two New Species of Cryptocephalum n. gen. (Monogenoidea: Dactylogyridae) from the Cephalic Lateral Line of Percichthys trucha (Perciformes: Percichthyidae) in Patagonia, Argentina Author(s) (original) (raw)
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Journal of Parasitology, 2011
Two new species of Monogenoidea were found parasitizing the cephalic lateral line canals of Percichthys trucha (Valenciennes) (Perciformes: Percichthyidae). These species are described as members of a newly proposed genus of Dactylogyridae. Cryptocephalum n. gen. is characterized by the site of infection and the combination of the several features: ventral and dorsal anchor/ bar complexes, anchors with strongly elongated shaft and recurved point, shaft and point of dorsal anchors protruding laterally from haptor, hooks with 2 subunits and with pair 5 smaller than the others; gonads overlapping; coiled male copulatory organ with counterclockwise rings, accessory piece formed by 2 distinct parts, and a tubular, sclerotized ventral vagina. Cryptocephalum petreum n. sp. is characterized by having both anchor pairs protruding laterally from haptor, male copulatory organ with a coil of 2-1/2 rings, accessory piece tweezers-shaped, and sclerotized vaginal vestibule. Cryptocephalum spiralis n. sp. has ventral anchors protruding ventrally and dorsal ones protruding laterally, male copulatory organ with a coil of 1-1/2 rings, the antero-dorsal part of the accessory piece saddle-shaped, vaginal vestibule not present, and coiled vagina. This is the first record of Dactylogyridae species parasitizing the cephalic lateral line of fishes.
Folia Parasitologica, 2013
While investigating the parasites of several marine fishes from the Western Atlantic, the Southern Gulf of Mexico and Central America (Panama), the following monogenoidean species from the gills of gerreid fishes (Gerreidae) were found: Diplectanum gatunense sp. n. (Diplectanidae) and Octouncuhaptor eugerrei gen. et sp. n. (Dactylogyridae) in Eugerres brasilianus (Cuvier) from Gatun Lake in the Panama Canal Watershed, and Diplectanum mexicanum sp. n. in Diapterus rhombeus (Cuvier) from the coast of Campeche State, Mexico. New diplectanid species are distinguished from other species of the genus by the general morphology of the copulatory complex and by the shape of the anchors and bars on the haptor. Octouncuhaptor gen. n. is proposed for its new species having slightly overlapping gonads (testis posterodorsal to the ovary), a dextrolateral vaginal aperture, a copulatory complex consisting of a coiled male copulatory organ with counterclockwise rings with the base articulated to the accessory piece, 8 pairs of hooks and the absence of anchors and bars on haptor. Our analysis of morphological features of Diplectanum species on gerreids evidences that these parasites more closely resemble each other than the known species from sciaenids suggesting that split between gerreids and sciaenids resulted in parasite speciation.
Journal of Parasitology, 2004
During a parasitological survey of Patagonian freshwater fishes, specimens of a new species of Monogenea were collected from the gills of Percichthys trucha (Perciformes: Percichthyidae). This species is described as the only member of a newly proposed genus of Ancyrocephalinae. Duplaccessorius n. gen. (Dactylogyridae, Ancyrocephalinae) is characterized by hooks with 2 subunits, gonads in tandem, a coiled male copulatory organ with counterclockwise rings, an accessory piece formed by 2 distinct parts, and a nonsclerotized sinistrolateral vagina with a funnel shape vestibule. Duplaccessorius andinus n. sp. infects the gills of P. trucha (Cuvier and Valenciennes, 1840) from Andean Patagonian lakes, being the first species of Ancyrocephalinae described from a South American percichthyid.
Acta parasitologica / Witold Stefański Institute of Parasitology, Warszawa, Poland, 2016
Two new species of Sciadicleithrum Kritsky, Thatcher and Boeger, 1989 are described from two cichlids from the Araguarí River, State of Amapá, northern Brazil. Sciadicleithrum edgari n. sp. from Satanoperca jurupari (Heckel, 1840) differs from all congeneric species in the morphology (hook-shaped, with middle process and distally bifurcate) of the accessory piece of the male copulatory organ (MCO). Sciadiclethrum araguariensis n. sp. from Crenicichla labrina (Spix and Agassiz, 1831) can be distinguished from all other species by a Y-shaped accessory piece of MCO. In addition to the description of two new species, new host and geographical records of six dactylogyrid monogeneans from cichlid fishes are presented.
1997
Two species of Calpidothecium, 2 species (1 new) of Calpidothecioides, 1 new species of Odothecium, and 1 new species of Notothecioides (Dactylogyridae, Ancyrocephalinae) are described and/or reported from the gills of 4 species of Serrasalmidae from the Brazilian Amazon: Calpidothecium crescentis (Mizelle and Price, 1965) comb. n. (syn. Urocleidus crescentis Mizelle and Price, 1965), C. serrasalmus (Mizelle and Price, 1965) comb. n. (syn. Cleidodiscus serrasalmus Mizelle and Price, 1965), and Calpidothecioides pygopristi sp. n. from Pygopristis denticulata; Odothecium raphidiophallum sp. n. from Catoprion mento; and Notothecioides llewellyni sp. n. from Myleus torquatus and M. rubripinnis. Four new genera are proposed: Calpidothecium is characterized by dactylogyrids with a single vagina opening sinistrolaterally, 1 pair of eyes, overlapping gonads, a seminal vesicle representing a dextral loop of the vas deferens, and a distal rod of the accessory piece with terminal branches; Calpidothecioides is characterized by species with a double vagina (left branch opening sinistrolaterally, right branch looping right cecum and opening on the dorsomedial body surface), 1 pair of eyes, overlapping gonads, a seminal vesicle comprising a dextral loop of the vas deferens, and a simple termination of the distal rod of the accessory piece; Odothecium is characterized by helminths with a single vagina looping the left cecum and opening on the middorsal body surface, 2 pairs of eyes, overlapping gonads, a seminal vesicle representing a dextral loop of the vas deferens, and a hook-shaped termination of the distal rod of the accessory piece; Notothecioides is characterized by species with the vagina looping the left cecum and opening on the middorsal body surface, 2 pairs of eyes, overlapping gonads, a sigmoid seminal vesicle, and a simple or hook-shaped termination of the distal rod of the accessory piece. Urocleidus orthus Mizelle and Price, 1965, is transferred to Calpidothecioides.
2009
Urocleidoides strombicirrus (Price and Bussing, 1967) is reported for the first time from A. aeneus and Astyanax fasciatus in Panama. Characithecium costaricensis (Price and Bussing, 1967) n. comb. is detailed based on specimens from A. aeneus. Characithecium costaricensis is characterized by having overlapping gonads, a medioventral vaginal aperture, a copulatory complex consisting of single counterclockwise coil of the copulatory organ that is articulated to the accessory piece, and a haptor having 2 pairs of anchors, dorsal and ventral bars, and 14 hooks. Measurements of body size varied substantially among individual worms, both within and across different host species and locations. However, the morphological differences were insufficient to separate species of Characithecium. This result suggests limited parasite speciation across sympatric species of Astyanax in Mexico and Panama. Urocleidoides Mizelle and Price, 1964, was erected for a species that infected Poecilia reticulata (Poeciliidae) in a California aquarium. Mizelle et al. (1968) emended it by adding gonads overlapping or tandem, male copulatory organ coiled with a single or multiple rings, 1 or 2 prostatic reservoirs, and vaginal pore on the left side of the body or absent. Urocleidoides included species from fishes in 5 orders (Atheriniformes, Characiformes, Gymnotiformes, Perciformes, and Siluriformes) until Kritsky et al. (1986) emended Urocleidoides and restricted it to species having a sinistral vaginal sclerite. Kritsky et al. (1986) transferred several species to Gussevia Kohn and Paperna, 1964, and designated 22 species as incertae sedis, including the 5 dactylogyrids:
Journal of Parasitology, 2007
During an investigation of the diversity of metazoan parasites of 7 freshwater fish species from 3 localities in central Panama, the following gill dactylogyrid (Monogenoidea) species were found: Aphanoblastella chagresii n. sp. from Pimelodella chagresi (Heptapteridae); Aphanoblastella travassosi (Price, 1938) Kritsky, Mendoza-Franco, and Scholz, 2000 from Rhamdia quelen (Heptapteridae); Diaphorocleidus petrosusi n. sp. from Brycon petrosus (Characidae); Gussevia asota Kritsky, Thatcher, and Boeger, 1989, from Astronotus ocellatus (Cichlidae); Sciadicleithrum panamensis n. sp. from Aequidens coeruleopunctatus (Cichlidae); Urocleidoides flegomai n. sp. from Piabucina panamensis (Lebiasinidae); and Urocleidoides similuncus n. sp. from Poecilia gillii (Poeciliidae). Consideration of the comparative morphology and distribution of these parasites along with the evolutionary history of the host fishes suggests that diversification may be associated with geotectonic events that provided isolation of the Central American fauna with the uplift of the Panamanian Isthmus during early Pliocene (3 mya).