Results 41 to 50 of about 1,823 (231)
Brazilian Journal of Biology, 2022 This research aimed to estimate the length-weight ratio (LWR) of the stingray Potamotrygon wallacei, known locally as the cururu, which was caught in streams and lakes in the middle Negro River region, Amazonas, Brazil. The stingrays were captured during
M. G. Amazonas +4 more
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DIVERSIDADE DE RAIAS DE ÁGUA DOCE (Chondrichthyes : Potamotrygonidae) NO ESTUÁRIO AMAZÔNICO
Arquivos de Ciências do Mar, 2008 Um levantamento sobre registros de ocorrência de raias de água doce (Potamotrygonidae) no estuário amazônico foi realizado utilizando-se dados bibliográficos, informações de coleções científicas disponíveis on-line e amostragens de campo. Os resultados indicaram a presença de oito espécies nominais: Plesiotrygon iwamae, Paratrygon aiereba,Potamotrygon
Maurício Pinto De Almeida +3 more
openalex +3 more sources
, 2021 O numero de nematodeos descritos em elasmobrânquios e relativamente pequeno, sendo encontrados majoritariamente no trato digestorio. Apesar de alguns relatos descritos, a literatura a respeito ainda e considerada escassa principalmente sobre a associacao
Antônio Carlos Freitas Souza +4 more
openalex +3 more sources
Evolution of reproductive modes in sharks and rays
Journal of Evolutionary Biology, Volume 36, Issue 11, Page 1630-1640, November 2023., 2023 The evolution of reproductive modes in sharks, rays, and chimaeras. Abstract The ecological and life history drivers of the diversification of reproductive modes in early vertebrates are not fully understood. Sharks, rays and chimaeras (group Chondrichthyes) have an unusually diverse variety of reproductive modes and are thus an ideal group to test the
Gergely Katona +7 more
wiley +1 more source
Comparing the performance of 12S mitochondrial primers for fish environmental DNA across ecosystems
Environmental DNA, Volume 3, Issue 6, Page 1113-1127, November 2021., 2021 We propose a framework for comparing the performance of primer pairs, which we applied to the comparison of two fish eDNA primer pairs, teleo and MiFish‐U. We showed how those primer pairs could be best used together to increase diversity coverage of eDNA studies.
Andrea Polanco F. +12 more
wiley +1 more source
Brazilian journal of biology = Revista brasleira de biologia, 2022 The objective of this study was to describe the histology and histochemistry of the integument covering the back and stinger of the freshwater stingray Potamotrygon rex, endemic to the Middle Upper Tocantins River.
D. G. Ribeiro-Neto +4 more
semanticscholar +1 more source
Journal of Fish Biology, Volume 99, Issue 4, Page 1158-1189, October 2021., 2021 ABSTRACT Freshwater fish communities in Ecuador exhibit some of the highest levels of diversity and endemism in the Neotropics. Unfortunately, aquatic ecosystems in the country are under serious threat and conditions are deteriorating. In 2018–19, the government of Ecuador sponsored a series of workshops to examine the conservation status of Ecuador's ...
Windsor E. Aguirre +15 more
wiley +1 more source
Revista da Sociedade Brasileira de Medicina Tropical, 2023 Venomous fish are commonly found in Brazilian waters. The most important marine venomous fish species are stingrays (Dasyatidae, Gimnuridae, Myliobatidae, and Rhinopteridae families), catfish (Ariidae family), scorpionfish and lionfish (both Scorpaenidae
Vidal Haddad Junior +1 more
doaj +1 more source
A Neoselachian shark from the non-marine Wessex Formation (Wealden Group: early Cretaceous, Barremian) of the Isle of Wight, southern England [PDF]
, 2006 Bulk screening of Early Cretaceous (Barremian) Wessex Formation strata exposed on the south-east coast of the Isle of Wight, southern England, has resulted in the recovery of neoselachian shark teeth referred to the scyliorhinid Palaeoscyllium. These are
Sweetman, Steven C. +1 more
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Biota Colombiana, 2010 The presence of the Plesiotrygon iwamae (Chondrichthyes: Potamotrygonidae) in Colombia is confirmed, based on a male specimen collected in the Amazon River and must be alert about their conservation status in the Amazon region.
Carlos A. Lasso +2 more
doaj +1 more source