Results 81 to 90 of about 4,709 (218)

Chondrichthyans from the Devonian–Early Carboniferous of Belarus [PDF]

Estonian Journal of Earth Sciences, 2018
Diverse remains of chondrichthyans were found in several stratigraphic levels in 18 cores of the Devonian and Lower Carboniferous of Belarus. Most of the taxa were first reported in that territory. A new species of ctenacanthiform shark, Tamiobatis elgae,
Alexander O. Ivanov, Dmitry P. Plax
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

Genome‐Wide DNA Methylation Patterns Predict Age in the Zebra Shark (Stegostoma tigrinum) and Provide Insight Into the Evolution of Vertebrate Aging

Molecular Ecology, Volume 35, Issue 7, April 2026.
ABSTRACT Epigenomic changes are a hallmark of aging, and DNA methylation (DNAm) has emerged as the most reliable molecular marker of an individual's age. Genome‐wide patterns of age‐associated hypo‐ and hypermethylation have been applied to generate predictive models (i.e., “epigenetic clocks”) capable of estimating chronological age in an increasingly
Samantha L. Bock, Kady Lyons, Lei Yang, Jennifer Wyffels, Lance Adams, Nienke Klerks, Aaron Jeskie, Ellen Leever, Taylor Hartl, Javier Almunia, Dan Peterson, Ana Ferreira, Joe Okamoto, Kate Archibald, Chris Spaulding, Kayla Leyden, Gisele A. Montano, Savannah Vasey, Adrienne Rowland, Lise Watson, Alfonso Lopez, Jay Hemdal, Mike Stafford, Anne Bronikowski, Gavin J. P. Naylor, Benjamin B. Parrott   +25 more
wiley   +1 more source

Extinction risk and conservation of the world’s sharks and rays

eLife, 2014
The rapid expansion of human activities threatens ocean-wide biodiversity. Numerous marine animal populations have declined, yet it remains unclear whether these trends are symptomatic of a chronic accumulation of global marine extinction risk.
Nicholas K Dulvy, Sarah L Fowler, John A Musick, Rachel D Cavanagh, Peter M Kyne, Lucy R Harrison, John K Carlson, Lindsay NK Davidson, Sonja V Fordham, Malcolm P Francis, Caroline M Pollock, Colin A Simpfendorfer, George H Burgess, Kent E Carpenter, Leonard JV Compagno, David A Ebert, Claudine Gibson, Michelle R Heupel, Suzanne R Livingstone, Jonnell C Sanciangco, John D Stevens, Sarah Valenti, William T White   +22 more
doaj   +1 more source

An annotated checklist of the chondrichthyans of Taiwan 

Zootaxa, 2013
An annotated checklist of chondrichthyan fishes (sharks, batoids, and chimaeras) occurring in Taiwanese waters is presented. The checklist is the result of a biodiversity workshop held in Mach 2012 as well as on-going systematic revisions by the authors.
Ebert, D.A., White, W.T., Hsuan-Ching Ho, Last, P.R., Nakaya, N., /Séret, Bernard, Straube, N., Naylor, G.J.P., De Carvalho, M.R.   +8 more
openaire   +3 more sources

Genome‐wide identification and solute selectivity of aquaporins in the sharpnose sevengill shark, Heptranchias perlo

Physiological Reports, Volume 14, Issue 8, April 2026.
Abstract The aquaporin genes (aqps) are widely distributed among vertebrates. In cartilaginous fish, aqp3 and aqp10 are duplicated, whereas many species have lost aqp8. While the solute permeability of aquaglyceroporins and Aqp8 exhibits significant diversity, systematic evaluations of their activity within species are limited.
Shinichiro Hidaka, Ayumi Nagashima, Akira Kato   +2 more
wiley   +1 more source

Age and growth of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae) in southern Brazil [PDF]

, 2018
Age and growth studies are fundamental to successful fisheries management. Zapteryx brevirostris (Muller & Henle, 1841) is distributed off the Brazilian continental shelf and this species is assessed as "Vulnerable" in the Red List of the International ...
Carmo, Wanessa P. D., Coelho, Rui, Favaro, Luis Fernando   +2 more
core   +4 more sources

The lower jaw of Devonian ray‐finned fishes (Actinopterygii): Anatomy, relationships, and functional morphology

The Anatomical Record, Volume 309, Issue 3, Page 550-602, March 2026.
Abstract Actinopterygii is a major extant vertebrate group, but limited data are available for its earliest members. Here we investigate the morphology of Devonian actinopterygians, focusing on the lower jaw. We use X‐ray computed tomography (XCT) to provide comprehensive descriptions of the mandibles of 19 species, which span the whole of the Devonian
Ben Igielman, Rodrigo Tinoco Figueroa, Robert R. Higgins, Stephanie E. Pierce, Michael I. Coates, Emily M. Troyer, Vincent Fernandez, Kathleen Dollman, Jing Lu, Min Zhu, Matt Friedman, Sam Giles   +11 more
wiley   +1 more source

A new paleozoic Symmoriiformes (Chondrichthyes) from the late Carboniferous of Kansas (USA) and cladistic analysis of early chondrichthyans.

PLoS ONE, 2011
BackgroundThe relationships of cartilaginous fishes are discussed in the light of well preserved three-dimensional Paleozoic specimens. There is no consensus to date on the interrelationship of Paleozoic chondrichthyans, although three main phylogenetic ...
Alan Pradel, Paul Tafforeau, John G Maisey, Philippe Janvier   +3 more
doaj   +1 more source

The Global Threat to Manta and Mobula Rays [PDF]

, 2010
Manta and mobula rays span the tropics of the world and are among the most captivating and charismatic of marine species. However, their survival is severely threatened by growing fisheries pressure driven by demand for the gill rakers that the animals ...
Shawn Heinrichs
core