Results 61 to 70 of about 6,684 (211)

A new euselachian shark from the early Permian of the Middle Urals, Russia [PDF]

Acta Palaeontologica Polonica, 2017
The isolated teeth of a new euselachian shark Artiodus prominens Ivanov and Duffin gen. et sp. nov. have been found in the Artinskian Stage (Early Permian) of Krasnoufimskie Klyuchiki quarry (Sverdlovsk Region, Middle Urals, Russia).
Alexander O. Ivanov, Christopher J. Duffin, Serge V. Naugolnykh   +2 more
doaj   +1 more source

A CHECK-LIST OF FOSSIL CHONDRICHTHYES FROM BRIELAS (LANGHIAN, PORTUGAL) [PDF]

, 2018
Located in a slope of the Costa de Caparica motorway, in the peninsula of Setúbal, West Portugal, the outcrop of Brielas stand out as one of the best Miocene sections of the Lower Tagus Basin to collect a great diversity of fossil Chondrichthyes, which ...
Antunes, Miguel, Balbino, Ausenda, Fialho, Pedro   +2 more
core  

Comparison of Short Generalist and Specific Markers to Assess the Diversity of Arthropods Using eDNA Metabarcoding

Environmental DNA, Volume 7, Issue 6, November–December 2025.
By analyzing > 1200 eDNA samples with different markers amplifying arthropods, we show that generalist and specific markers produce correlated pictures of community variation; still specific markers provide a more accurate measure of biodiversity and of its response to environmental stressors.
Gentile Francesco Ficetola, Alexis Carteron, Silvio Marta, Aurelie Bonin, Isabel Cantera, Pierre Taberlet, Alessia Guerrieri   +6 more
wiley   +1 more source

Hybodont sharks of the English Bathonian and Callovian (Middle Jurassic). [PDF]

, 2008
Recent bulk sampling and study of museum collections has revealed a high diversity of hybodont sharks from the English Bathonian, with 15 species being recognised.
AGASSIZ, ANSORGE, ARKELL, BENTON, BIGOT, BONEHAM, BROOM, BROUGH, BROWN, BROWN, BŁAŻEJOWSKI, CAPPETTA, CAPPETTA, CAPPETTA, CAPPETTA, CASIER, CASIER, CHARLESWORTH, COPE, CUNY, CUNY, CUNY, DELSATE, DINELEY, DUFFIN, DUFFIN, DUFFIN, EGERTON, EGERTON, ERASMO, ESTES, EVANS, FRAAS, GLIKMAN, GUENNEGUES, HAY, HERMAN, HORTON, JAEKEL, KRIWET, KRIWET, MAISEY, MAISEY, MAISEY, MAISEY, MARTILL, METCALF, MEYER, NESSOV, OWEN, OWEN, PALMER, PATTERSON, PEYER, PHILLIPS, QUENSTEDT, REES, REES, REES, REES, REIF, RIEPPEL, SAVAGE, STROMER, SUMBLER, SWEETMAN, THIES, UNDERWOOD, UNDERWOOD, UNDERWOOD, UNDERWOOD, UNDERWOOD, WOODWARD, WOODWARD, WOODWARD, WOODWARD, ZANGERL   +76 more
core   +1 more source

Myocardial trabeculation in embryos of Scyliorhinus canicula (Elasmobranchii, Chondrichthyans)

The FASEB Journal, 2018
Currently, three types of ventricular myoarchitecture are recognized in vertebrates, namely compact, spongy (trabeculated) and mixed myocardium. Mixed myocardium, which has been recently proposed as the primitive condition in gnathostomes, is composed of two myocardial layers: an inner trabeculated and an outer compact one.
López-Unzu, Miguel A., Rodríguez, Cristina, Lorenzale, Miguel, Fernández-Corujo, Borja, Durán-Boyero, Ana Carmen   +4 more
openaire   +2 more sources

Surface morphology and distribution of oropharyngeal taste papillae in sharks and rays (Elasmobranchii, Chondrichthyes): Implications for gustatory sensitivity

Journal of Anatomy, Volume 247, Issue 5, Page 924-952, November 2025.
This study investigates the morphology, abundance, and distribution of taste papillae in the oropharyngeal cavity of a range of elasmobranchs using SEM, histology, and topographic analyses. The interspecific importance of gustation is reflected in quantitative differences in the size, density, and distribution of taste papillae, which have implications
Carla J. L. Atkinson, Shaun P. Collin
wiley   +1 more source

Metacercarias del tipo Paramonilicaecum (Digenea: Didymozoidae), parásitos accidentales de elasmobranquios (Elasmobranchii) del golfo de México e identificación de metacercarias (Didymozoidae) de la Colección Nacional de Helmintos

Revista Mexicana de Biodiversidad, 2011
Como parte de un estudio sobre los helmintos parásitos de rayas (Elasmobranchii), se colectaron 12 ejemplares en 3 localidades del estado de Veracruz, México: Laguna de Tamiahua, Laguna de Tampamachoco y un arrecife de la costa del golfo de México.
Erick Rodríguez-Ibarra, Scott Monks, Griselda Pulido-Flores   +2 more
doaj   +1 more source

El sistema reproductor femenino de Zearaja chilensis (Guichenot, 1848) (Chondrichthyes, Rajidae): Gametogénesis y validación microscópica de los criterios de madurez [PDF]

, 2015
Los condrictios son extremadamente susceptibles a la explotación pesquera debido, entre otras cosas, a sus adaptaciones reproductivas. Los conocimientos básicos de sus parámetros reproductivos son esenciales, ya sea desde el punto de vista ecológico como
Di Giacomo, Edgardo Ernesto, Galíndez, Elena Juana, Wehitt, Anahi   +2 more
core   +1 more source

Testing the core–periphery hypothesis: a standardised multi‐phylum assessment of genetic diversity of marine coastal species

Ecography, Volume 2025, Issue 10, October 2025.
The core–periphery hypothesis (CPH) predicts that genetic diversity is greatest at the centre and lowest at the edges of a species' distribution because genetic diversity is a function of a species' abundance, which is also expected to be greatest at the centre and lowest at the edges of the distribution. Variants of the CPH include the ‘Ramped North' (
Daniel Cárcamo, Mailiu Díaz Peña, Jonathan P. A. Gardner   +2 more
wiley   +1 more source

Coastal rocky reef fishes of Santa Catarina's northern islands, Brazil

Frontiers in Marine Science, 2015
The coast of the state of Santa Catarina only has non-biogenic reefs, i.e. rocky and artificial reefs, and is considered the geographic south limit for many reef fish species.
Johnatas Adelir Alves, Leonardo Schlögel Bueno, Diogo Augusto Moreira, Alberto Teodorico Correia, Alberto Teodorico Correia   +4 more
doaj   +1 more source