Plesiotrygon iwamae, a New Genus and Species of Neotropical Freshwater Stingray (Chondrichthyes: Potamotrygonidae)

Rosa, Ricardo S.; Castello, Hugo P.; Thorson, Thomas B.

doi:10.2307/1445783

Cited by 39 publications

(40 citation statements)

References 12 publications

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“…As presently de¢ned, the Potamotrygomidae comprises three genera, Paratrygon, Plesiotrygon, and Potamotrygon; I will here refrain from including an undescribed potamotrygonid (Ishihara & Taniuchi, 1995) or other genera that have recently been hypothesized as being sister taxa to the river stingrays, notably amphi-American Himantura and Taeniura (Lovejoy, 1996;McEachran et al, 1996;McEachran & Aschliman, 2004). Rosa et al (1987) provide a key to potamotrygonid genera. Paratrygon is monotypical, represented by P. aiereba, is widely distributed in the Amazon and Orinoco river basins in northern Bolivia, eastern Peru, northern Brazil, and Venezuela, and bears only two young per litter (Compagno & Cook, 1995a;Lasso et al, 1996).…”

Section: Case History: Potamotrygonidaementioning

confidence: 99%

“…Paratrygon is monotypical, represented by P. aiereba, is widely distributed in the Amazon and Orinoco river basins in northern Bolivia, eastern Peru, northern Brazil, and Venezuela, and bears only two young per litter (Compagno & Cook, 1995a;Lasso et al, 1996). Plesiotrygon is also monotypical, represented by P. iwamae, occurs in upper-and mid-Amazon drainages of Equador and Brazil, and feeds on small cat¢sh, insects, decapod crustaceans, and parasitic cestodes and nematodes (Rosa et al, 1987;Compagno & Cook, 1995a). Potamotrygon contains 18 described species plus at least ¢ve undescribed species, with most species restricted to a single basin or river system (Compagno & Cook, 1995a;Compagno, 1999a).…”

Section: Case History: Potamotrygonidaementioning

confidence: 99%

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conservation of freshwater and euryhaline elasmobranchs: a review

Martin¹

2005

J. Mar. Biol. Ass.

114

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Published data on the diversity, life history, ecology, and status of freshwater and euryhaline elasmobranchs was reviewed in the context of anthropogenic threats and principles of conservation biology. At least 171 species of elasmobranch, representing 68 genera and 34 families, are recorded from fresh or estuarine waters. Of these, over half are marginal in estuaries, less than one-tenth are euryhaline, and one-¢fth are obligate in fresh water. Obligate freshwater elasmobranchs are dominated by myliobatoid stingrays, of which two-thirds are potamotrygonids endemic to Atlantic drainages of South America. Freshwater and euryhaline elasmobranchs adhere to strongly K-selected life histories and feed at high trophic levels, similar to those of their marine relatives. However, freshwater and euryhaline elasmobranchs are also subject to habitat constraints, notably more limited volume and physicochemical variability than the ocean, that may render them more vulnerable than marine elasmobranchs to the e¡ects of human activities. The greatest diversity and abundance of freshwater and euryhaline elasmobranchs occur in tropical countries with enormous and rapidly increasing human populations, notably South America, West Africa, and south-east Asia. Knowledge of the biology, distribution, ecology, and status of freshwater and euryhaline elasmobranchs is frustrated by unresolved taxonomic problems, which are brie£y summarized. To clarify selected issues in the conservation of freshwater and euryhaline elasmobranchs, special attention is given to sharks of the genus Glyphis, pristids, and potamotrygonids. To foster live release when possible as well as prevent discard of specimens and loss of data, an illustrated key to di¡erentiate Carcharhinus from Glyphis sharks is provided. Obligate freshwater elasmobranchs with limited geographic ranges are deemed most vulnerable to extinction, but euryhaline elasmobranchs that require access to the sea to breed are also at signi¢cant risk. Based on the foregoing data and principles of conservation biology, suggested action plans for the conservation of freshwater and euryhaline elasmobranchs and the conservation of freshwater habitats are provided.

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Section: Case History: Potamotrygonidaementioning

confidence: 99%

Section: Case History: Potamotrygonidaementioning

confidence: 99%

conservation of freshwater and euryhaline elasmobranchs: a review

Martin¹

2005

J. Mar. Biol. Ass.

114

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“…In the present study, the classification of Carvalho et al (2004) was adopted. Four potamotrygonid genera are currently recognized: Paratrygon Duméril, 1865; Potamotrygon Garman, 1877; Plesiotrygon Rosa, Castello, andThorson, 1987 (Rosa et al, 1987;Carvalho et al, 2003), and the recently described Heliotrygon (Carvalho and Lovejoy, 2011).…”

Section: Introductionmentioning

confidence: 99%

Characterization and description of a multiple sex chromosome system in Potamotrygon motoro (Chondrichthyes, Myliobatiformes) from the Paraná River, Argentina

Aichino

Pastori²,

Roncati³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. The Potamotrygonidae family represents the only freshwater group of specialized elasmobranchs and is composed of 4 genera: Plesiotrygon, Paratrygon, Potamotrygon, and Heliotrygon. Individuals of Potamotrygon motoro were collected from the Paraná River at Ituzaingó (Province of Corrientes) in Argentina. Mitotic preparations were obtained using direct techniques and lymphocyte cultures. Chromosomes were studied with conventional Giemsa, C-band and nucleolus organizer region stainings. The diploid number and karyotype formulae were 2n = 66 with 33 homomorphic pairs (14M + 16SM + 22ST + 14A) in females and 2n = 65 with 31 homomorphic pairs plus 3 heteromorphic chromosomes (13M + 15SM + 23ST + 14A) in males. Heterochromatin was distributed at ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 12 (3): 2368-2375 (2013) Sexual chromosome system in Potamotrygon motoro 2369 the pericentromeric regions of almost all chromosomes and in the telomeric and interstitial positions of some chromosomes. nucleolus organizer regions were multiple and located at telomeric regions. Because of the clear karyotype differences between the 2 sexes and the presence of 3 unpaired chromosomes in males, it is possible to suggest the occurrence of a multiple sex chromosome system, with male heterogamety (X 1 X 1 X 2 X 2 /X 1 X 2 Y). Further cytogenetic studies are required to develop a hypothesis about the origin of the multiple sex chromosome system in P. motoro.

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“…Four genera are recognized in the South American freshwater stingray family Potamotrygonidae: Paratrygon Duméril, 1865, Potamotrygon Garman, 1877, Plesiotrygon Rosa, Castello & Thorson, 1987and Heliotrygon Carvalho & Lovejoy, 2011(Rosa et al, 1987Carvalho et al, 2003;Carvalho & Lovejoy, 2011). The genera Paratrygon and Plesiotrygon are presently monospecific, whereas Heliotrygon has two valid species (Carvalho & Lovejoy, 2011) and Potamotrygon has approximately 20 valid species (Carvalho et al, 2003;Rosa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

A taxonomic and morphological redescription of Potamotrygon falkneri Castex & Maciel, 1963 (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Silva

Carvalho

2011

Neotrop. ichthyol.

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A taxonomic revision of two nominal species of freshwater stingrays of the genus Potamotrygon previously considered valid, Potamotrygon falkneri Maciel, 1963 and Potamotrygon castexi Castello &Yagolkowski, 1969, was conducted based on a detailed analysis of external and internal morphology, including a morphometric and meristic study of specimens from the recorded range of both species. The taxonomic status of the nominal species P. menchacai Achenbach, 1967, treated by previous authors as a junior synonym of P. falkneri, was also evaluated. These nominal species, which constitute what has been called the falkneri-castexi complex, were found to represent examples of chromatic variation present in a single species, given that intermediate patterns of coloration are common and the remaining characters analyzed are not consistent enough for separation at the specific level. Consequently, Potamotrygon falkneri is considered valid, whereas the nominal species Potamotrygon castexi and Potamotrygon menchacai are concluded to be junior synonyms of P. falkneri. Additionally, a putative new species is identified from the río Madre de Díos in Peru, which has some characters that do not correspond to P. falkneri. This species, known from few individuals, is here provisionally treated as Potamotrygon sp. Uma revisão taxonômica de duas espécies nominais de raias de água doce do gênero Potamotrygon previamente consideradas válidas, Potamotrygon falkneri Castex & Maciel, 1963 e Potamotrygon castexi Castello & Yagolkowski, 1969, foi realizada baseada numa análise detalhada abrangendo aspectos da morfologia externa e interna, incluindo um estudo morfométrico e merístico de espécimes provenientes da distribuição registrada dessas espécies. Além dessas espécies, o status taxonômico da espécie nominal Potamotrygon menchacai Achenbach, 1967, tratada por autores prévios como sinônimo júnior de Potamotrygon falkneri, foi avaliado. As espécies nominais que constituem o que foi chamado de complexo falkneri-castexi representam exemplos da variação cromática encontrados em uma única espécie, uma vez que ocorrem padrões intermediários de coloração e os caracteres restantes não são consistentes para separação em nível específico. Sendo assim, a espécie nominal P. falkneri é considerada válida e as espécies nominais P. castexi e P. menchacai sinônimos juniores desta. Adicionalmente, uma possível espécie nova é apresentada do río Madre de Dios no Peru, sendo esta portadora de alguns caracteres destoantes de P. falkneri. Essa espécie, conhecida de poucos indivíduos, é tratada aqui provisoriamente como Potamotrygon sp.

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Plesiotrygon iwamae, a New Genus and Species of Neotropical Freshwater Stingray (Chondrichthyes: Potamotrygonidae)

Cited by 39 publications

References 12 publications

conservation of freshwater and euryhaline elasmobranchs: a review

conservation of freshwater and euryhaline elasmobranchs: a review

Characterization and description of a multiple sex chromosome system in Potamotrygon motoro (Chondrichthyes, Myliobatiformes) from the Paraná River, Argentina

A taxonomic and morphological redescription of Potamotrygon falkneri Castex & Maciel, 1963 (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

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