ORCID Profile
0000-0002-4281-8711
Current Organisation
Universidade de São Paulo
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Publisher: Cambridge University Press (CUP)
Date: 19-11-2010
DOI: 10.1017/S0022149X10000684
Abstract: The marine-derived stingrays of Potamotrygonidae, endemic to South American river systems, host an interesting parasite fauna equally related to marine lineages. Among those lineages, the ersity and phylogenetic relationships within Potamotrygonocotyle – a monocotylid monogenoidean specific to potamotrygonids – are poorly known, since 9 of 10 species attributed to this genus have been described in the past 3 years. Here, we readdress the ersity of Potamotrygonocotyle after examining the gills of 436 potamotrygonid in iduals representing 12 described and 14 potentially undescribed species of freshwater stingrays from 19 major river systems of South America (i.e. sub-basins). We recognized 12 valid species within the parasite genus, of which four are described in this study. Our taxonomic decisions were based on the phylogenetic analysis of 14 ingroup terminal taxa and 12 morphological characters, which resulted in the following hypothesis of sister-group relationships: (( P . dromedarius , P . tatianae sp. nov.), ( P . rionegrense , P . auriculocotyle sp. nov., (( P . quadracotyle , P . umbella ), ( P . septemcotyle sp. nov., ( P . chisholmae , P . uruguayense )), ( P . tsalickisi , P . eurypotamoxenus , P . rarum , ( P . tocantinsense sp. nov., P . aramasae ))))). According to our hypothesis, the absence of autapomorphic features for some nominal species, and the re-evaluation of morphological variation among populations, led us to consider P . eurypotamoxenus and P . uruguayense as junior synonymys of P . tsalicksi and P . chisholmae , respectively. Finally, we address the importance of biogeographic and host representation, in order to fully understand the patterns of morphological variation and host specificity within this group. We found that hypotheses of species delimitation depend greatly on efforts to s le specimens throughout its distributional range and that host specificity within this genus varies dramatically among lineages.
Publisher: Springer Science and Business Media LLC
Date: 11-04-2007
DOI: 10.1007/S11230-006-9086-Y
Abstract: The only known monocotylid genus to parasitise Neotropical freshwater stingrays (Potamotrygonidae) is Potamotrygonocotyle Mayes, Brooks & Thorson, 1981, a monotypic genus erected to accommodate P. tsalickisi Mayes, Brooks & Thorson, 1981. For more than 20 years, no other species has been recognised in this genus, but new efforts to survey the ersity of parasites inhabiting potamotrygonids have revealed the existence of new species and the need to redefine the genus. Here, the generic diagnosis of Potamotrygonocotyle is amended, P. tsalickisi is redescribed and four new species are recognised and described based on s les collected from the gills of freshwater potamotrygonids from the La Plata river basin: Potamotrygonocotyle chisholmae n. sp. and P. dromedarius n. sp. from Potamotrygon motoro Potamotrygonocotyle eurypotamoxenus n. sp. from Potamotrygon cf. motoro (type-host), P. castexi, P. falkneri and P. histrix and Potamotrygonocotyle uruguayensis n. sp. from Potamotrygon brachyura. Potamotrygonocotyle is characterised by species possessing: (1) slightly sinuous sclerotised ridges on all septa (2) two pairs of the dorsal haptoral accessory structures associated with the four posterior peripheral loculi and with anterior dorsal haptoral accessory structure bilobate or semicircular and (3) male copulatory organ without an accessory piece.
Publisher: Springer Science and Business Media LLC
Date: 09-11-2007
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/IS17008
Abstract: The uplift of the Panamanian isthmus in the Pliocene caused the termination of gene flow among members of many ancestral populations of marine lineages leading the ersification of geminate species confined to opposite sides of Central America. This palaeogeographical event has been evoked to explain the ersification of few lineages of batoids with trans-isthmian distribution. As such, there is the expectation that this vicariance event also affected lineages of parasites associated with them. Our study suggests that this event can explain the ersification of Parachristianella Dollfus, 1946 (Trypanorhyncha:Eutetrarhynchidae) in the Caribbean Sea and tropical eastern Pacific Ocean. We provide molecular, morphological and biogeographical evidence to recognise five lineages within this genus inhabiting the coastal waters of Panama, including P. parva C bell & Beveridge, 2007 and four new species: P. mendozai, sp. nov., P. kuchtai, sp. nov., P. c belli, sp. nov. and P. soldanovae, sp. nov. These species can be diagnosed by unambiguous sets of molecular characters. The morphological cohesiveness of sister species, which most likely erged from around 3million years ago through the uplift of the Panamanian isthmus, suggests that the traditional emphasis on the tentacular armature to circumscribe species within trypanorhynchs might underestimate the ersity of recently erged lineages.
No related grants have been discovered for Fernando Marques.