Results 31 to 40 of about 3,578 (213)
Integrative and Comparative Biology, 2022 AbstractHabitat transitions are key potential explanations for why some lineages have diversified and others have not—from Anolis lizards to Darwin's finches. The ecological ramifications of marine-to-freshwater transitions for fishes suggest evolutionary contingency: some lineages maintain their ancestral niches in novel habitats (niche conservatism),
Kolmann, M. +5 more
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Biovalentia: Biological Research Journal, 2022 A study to determine morphological characets of freshwater stingray in Musi River of South Sumatra Province has been conducted from June to December 2020. The fishes were collected in Musi River where located at middle of Palembang city.
Amran Halim +2 more
doaj
Endangered Species Research, 2023 Recently, Lim & Then (2022; Endang Species Res 48:43-50) used an environmental DNA (eDNA) PCR-based method for detecting the presence of an endangered species of freshwater stingray, Fluvitrygon kittipongi (Dasyatidae), in the Pahang River basin, east ...
NFMAH Alshari +4 more
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Venomous Freshwater Fish: Catfish and Freshwater Stingrays
, 2014 The authors comment the actual research on the properties of the toxins of the freshwater venomous fish and their potential use in Human Medicine. They discuss the mechanisms of inoculation, biochemical characteristics of the venoms, and clinical/therapeutical aspects of the envenomations, with emphasis in their studies on freshwater stingrays and ...
Haddad, Vidal +7 more
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Scientia Marina, 2020 The aim of this study was to assess the suitability of different vertebrae staining techniques for the visualization and counting of growth bands in tropical species of batoids (Narcine leoparda, Urotrygon aspidura, Hypanus longus, Potamotrygon ...
José G. Pérez-Rojas +4 more
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Description of a new actinosporean type from South African freshwater [PDF]
, 2004 The 1st report on actinospores described these organisms as parasites related to myxosporeans. For a long time this group of parasites was believed to represent an independent taxonomic entity.
Avenant-Oldewage, Annemarie +2 more
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RECTAL GLAND OF FRESHWATER STINGRAYS,POTAMOTRYGONSPP. (CHONDRICHTHYES:POTAMOTRYGONIDAE)
The Biological Bulletin, 1978 1. Contrary to some reports, a rectal gland is present in strictly freshwater stingrays of South American rivers (Potamotrygon spp.). 2. The gland has the location and histological features of the salt-secreting rectal gland of marine elasmobranchs, but is much reduced in size and number of tubules. 3. Its residual function, if any, is unknown. 4.
T B, Thorson, R M, Wotton, T A, Georgi
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Zoologia (Curitiba), 2010 Ergasilus trygonophilus sp. nov. is described from freshwater stingrays (Potamotrygon spp. and Plesiotrygon iwamae Rosa, Castello & Thorson, 1987) from the state of Pará, Brazil.
Marcus V. Domingues, Taísa M. Marques
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Two new species of entobdelline skin parasites (Monogenea, Capsalidae) from the blotched fantail ray, Taeniura meyeni, in the Pacific Ocean, with comments on spermatophores and the male copulatory apparatus [PDF]
, 2009 We made a comparative anatomical study of entobdelline monogenean skin parasites from the blotched fantail ray, Taeniura meyeni (= T. melanospila) from public aquaria and fish-holding facilities distributed widely across the western Pacific Ocean.
Dyer +13 more
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Multiple Cone Visual Pigments and the Potential for Trichromatic Colour Vision in Two Species of Elasmobranch [PDF]
, 2004 Elasmobranchs (sharks, skates and rays) are the modern descendents of the first jawed vertebrates and, as apex predators, often occupy the highest trophic levels of aquatic (predominantly marine) ecosystems.
Collin, Shaun P. +3 more
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