Two new species of Anacanthorus (Monogenoidea, Dactylogyridae) parasitizing serrasalmid fish in Brazil (original) (raw)
Related papers
Acta Parasitologica, 2019
Introduction Species of the genus Anacanthorus Mizelle & Price, 1965 represent commonly known parasites of Neotropical Characiformes. Anacanthorus is one of the most specious Neotropical monogenean genus, currently comprising 73 nominal species. Materials and methods Fish were obtained from the Miranda River, Mato Grosso do Sul, from the Xingu River, Pará, from the Mogi Guaçu River, São Paulo and from the Upper Parana River, Paraná, Brazil. The monogeneans found were examined in a light microscope and partial sequences of the mitochondrial cytochrome c oxidase 1 gene were obtained for most species. Results Two new species of Anacanthorus were retrieved from Brazilian serrasalmids and are described herein. Anacanthorus paraxaniophallus n. sp. from Serrasalmus maculatus Kner has great similarity to A. xaniophallus Kritsky et al. (J Helminthol Soc Wash 59:25-51, 1992) by the general morphology of the copulatory complex, but it can be easily differentiated by a larger accessory piece with a slightly curved point, by having a basal flap in the male copulatory organ and by the morphology of hooks, with flattened thumb. Anacanthorus myleusi n. sp. from Myloplus schomburgkii (Jardine) is mainly distinguished by its unique copulatory complex, possessing an inverted J-shaped MCO with terminal flare and a hook-shaped accessory piece. Additionally, new host records are provided to A. lepyrophallus, geographical records are provided to four species of Anacanthorus (A. lepyrophallus, A. maltai, A. sciponophallus and A. thatcheri), which are being recorded in the Paraná River basin for the first time, and we also provide molecular data for six species of Anacanthorus.
Parasite, 2019
Anacanthorus (Anacanthorinae) is one of the most speciose and common genera of neotropical monogeneans, yet there are still many gaps in our knowledge concerning their diversity and phylogeny. We performed phylogenetic analyses of molecular sequences in order to investigate the phylogenetic position within the Dactylogyridae of Anacanthorus spp. infesting serrasalmids from two Brazilian river basins. Sequences of partial 28S rDNA obtained for nine species of Anacanthorus and Mymarothecium viatorum parasitizing serrasalmids and the published sequences of other members of the Dactylogyridae were included in the phylogenetic reconstruction. Phylogenetic analyses supported the monophyly of anacanthorine monogeneans. The Anacanthorinae (represented in this study by Anacanthorus spp.) formed a monophyletic group included in a large clade together with a group of solely freshwater Ancyrocephalinae and species of the Ancylodiscoidinae. Mymarothecium viatorum (Ancyrocephalinae) was placed wi...
On Dactylogyridae (Monogenea) of four species of characid fishes from Brazil
Check List, 2009
Material collected from the fishes from the dams and fish farms of the Departamento Nacional de Obras contra as Secas (DNOCS) and from the tanks of the Itaipu Hydroelectric Station was examined in order to analyze the index and the infestation of Monogenea. Specimens of tambaqui (Colossoma macropomum), pacu (Piaractus mesopotamicus), pirapitinga (Piaractus brachypomus) and the hybrid tambacu (Colossoma macropomum X Piaractus mesopotamicus) were examined and five species of Monogenea were identified including: Mymarothecium viatorum Boeger, Piasecki & Sobecka, 2002, Mymarothecium boegeri Cohen & Kohn, 2005, Notozothecium euzeti Kritsky, Boeger & Jégu, 1996, Notozothecium januachensis Belmont-Jegu, Domingues & Martins, 2004 and Anacanthorus penilabiatus Boeger, Husak & Martins, 1995. Infection prevalence and intensity of infection and new data concerning Monogenea are presented. Key words: Monogenea, Parasites, Brazil, freshwater fishes.
Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária
With the aim of creating an inventory of the metazoan gill parasites of Salminus hilarii in the Taquari River, state of São Paulo, Brazil, five species of monogeneans (Anacanthorus contortus, A. bicuspidatus, Annulotrematoides parisellei, Jainus iocensis and Tereancistrum arcuatus) are reported the first time for this host. A total of 28 fish were sampled quarterly between April 2011 and January 2012, with 10 hosts in a lentic ecosystem and 18 in a lotic ecosystem. Quantitative ecological descriptors (prevalence, intensity of infestation and abundance) were calculated for the purpose to comparing the two ecosystems sampled (lentic and lotic ecosystems). However, no quantitative difference between the lentic and lotic ecosystems was observed. The present study has made available a checklist for species of the genus Anacanthorus and their hosts and geographical distribution in the Neotropical region up to the present time.
Zootaxa
During a long-term study of the parasites of fishes from the Paraná River, both below and above the reservoir of the Itaipu Hydroelectric Power Station, State of Paraná, Brazil, specimens of 10 species of Dactylogyridae (9 new and one previously known) were collected from the gills of Salminus brasiliensis. The following species are described and illustrated: Anacanthorus douradensis sp. n., A. bicuspidatus sp. n., A. daulometrus sp. n., A. contortus sp. n., A. parakruidenieri sp. n., Annulotrematoides bryconi Cuglianna, Cordeiro and Luque, 2003, A. glossophallus sp. n., A. parisellei sp. n., Jainus iocensis sp. n. and Tereancistrum arcuatus sp. n. Anacanthorus douradensis sp. n. appears closely related to Anacanthorus colombianus by sharing a MCO composed of a loosely spiraled tube and an articulated and bifurcated accessory piece; the new species may be differentiated from A. colombianus by the bifurcation of the accessory piece at the proximal portion of the structure, the presence of subequal rami of the accessory piece, and by the number of coils in the MCO (6 in the new against 3 in the previously described species). Anacanthorus bicuspidatus sp. n. has great similarity to Anacanthorus cuticulovaginus but can be easily differentiated by presenting one of the rami hook shaped and with a subterminal thumb-like expansion and MCO more delicate and slender, distally pointed. Anacanthorus daulometrus sp. n. is similar to A. cuticulovaginus and A. biscuspidatus sp. n. but differs by presenting one of the branches of the accessory piece bifid and by the presence of a conspicuous metraterm with heavily sclerotized walls. Anacanthorus contortus sp. n. resembles A. quinqueramus in depicting an accessory piece composed by five branches; the new species differs from this species by an accessory piece composed of two main branches, one of them with 4 sub-branches. Anacanthorus parakruidenieri is morphologically similar to Anacanthorus kruidenieri; these species are easily distinguishable by the presence of a bifurcated accessory piece and a subcircular foramen in the shank bulb of the new species. Annulotrematoides glossophalllus sp. n. differs from the previously known species of the genus, A. amazonicus and A. bryconi, by a relatively more robust and slightly arcuate MCO with a distinctive tongue-shaped expansion at the distal opening and by the presence of the flaplike expansion near midlength of the accessory piece. Annulotrematoides parisellei sp. n. closely resembles A. bryconi and A. glossophallus from which it can be distinguished by the comparative morphology of the copulatory complex (arcuate and delicate in the new species and robust with a tongue-shape distal end in the other two species). The general morphology of the copulatory complex of A. parisellei sp. n. resembles that of A. amazonicus, but differs by the morphology of all haptoral sclerites, presenting both ventral and dorsal anchors with conspicuous points evenly curved with shafts. Jainus iocensis sp. n. resembles J. amazonensis by the morphology of anchors, differing from this species by having a large sclerotization on the superficial root of ventral anchor and by the shape of the accessory piece, which is hook-shaped in the new species and distally flabellate in J. amazonensis. Finally, Tereancistrum arcuatus sp. n. can be easily distinguished from the other species of the genus by the MCO, which is an arcuate tube, while the others present a coiled copulatory organ. The few specimens of Annulotrematoides bryconi collected from S. brasiliensis are in accordance with the general morphology and measurements of the original description and type specimens.
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.
Neotropical Helminthology, 2012
Species of Prochilodus Agassiz 1829 are among the most abundant fishes of South America basins and has good potential for pisciculture. During a study of the helminth parasites of Prochilodus lineatus (Valenciennes, 1837) (Characiformes) from Mogi Guaçu River, Brazil, a new species of Tereancistrum was collected. Tereancistrum pirassununguensis n. sp. can be distinguished from the other Tereancistrium species mainly by having a reduced accessory anchor sclerite with a little groove at the end; MCO as a sclerotized coiled tube forming two counterclockwise rings; an accessory piece as an inverted C, rod-like, not articulated at the base of the MCO; curved ventral bar; hooks similar with erect thumb and slightly curved shaft and point, slightly expanded shank proximally. This is the first record of a species of Tereancistrum in the southeastern of Brazil.
Parasitology Research, 2013
As part of a biological inventory of the Rio Lacantún basin in the Biosphere Reserve of Montes Azules from Chiapas State (southeastern, Mexico), the following monogenoid ectoparasites infecting the external surface of the anal opening and the gill lamellae of the freshwater fish Astyanax aeneus (Characidae) in ten streams were found: Cacatuocotyle chajuli sp. nov. (anus), Cacatuocotyle exiguum sp. nov., and Cacatuocotyle sp. (gill lamellae). C. chajuli is differentiated from its single congener, Cacatuocotyle paranaensis (Boeger et al. Syst Parasitol 36:75-78, 1997), from the gills of Characidium lanei (Characidae) from Paraná Brazil, in having a noticeably V-shaped haptoral bar and larger hooks and anchors. C. exiguum differs from these two latter species in the size of its anchors. Illustrations and data on morphological and biometric variability of individual specimens of C. chajuli and C. exiguum from different streams are provided. The present data support the statement about three species of Astyanax, which harbor the richest monogenoidean diversity in the Neotropics with a total of 18 species reported up to now. Occurrences of species of Cacatuocotyle on different sites of infection on three distant host species [including a Neotropical cichlid (Cichlidae) species] suggest that these monogenoideans switching to new hosts can result in the availability of potential hosts within the same habitat instead of showing signs of preferential switching between closely related hosts or on their respective microhabitats.
Zoologia (Curitiba), 2016
Monogeneans represent one of the main components of the parasite fauna of freshwater fishes in the Neotropical Region, and as many as 629 species have been reported by Cohen et al. (2013) from South America, most of which belonging to the Dactylogyridae and parasitizing on the gills of teleost fishes. However, the number of species of these ectoparasites has increased steadily, with descriptions of dozens new species in recent decades, especially from characiform fishes (Cohen et al. 2012, Moreira et al. 2015). One of 39 genera of dactylogyrids parasitic on characiform fishes from South America, Diaphorocleidus (Monogenea: Dactylogyridae) was proposed by Jogunoori et al. (2004), with D. armillatus Jogunoori, Kritsky & Venkatanarasaiah, 2004 from the Neotropical Gymnocorymbus ternetzi (Boulenger, 1895) (Characidae) as the type species, introduced to India via the aquarium trade. They also proposed three new combinations, D. affinis