Results 41 to 50 of about 1,113 (96)

Biometric characterization of sharks of the genus Sphyrna (Griffith & Smith, 1834) on the coast of Sergipe

Biotemas, 2016
Sharks, rays and chimeras belonging to the subclass Elasmobranchii of the class Chondrichthyes have a slow maturation and development, and they are animals often caught as by-catch, making them vulnerable to extinction.
Jéssica Barros Andrade, Daniela Nascimento Santos, Maraisa de Oliveira Silva, Thays Brito Reis Santos, Thiago Silveira Meneses, Andressa Sales Coelho   +5 more
doaj  

Lista patrón de los tiburones, rayas y quimeras (Chondrichthyes, Elasmobranchii, Holocephali) de México [PDF]

Arxius de Miscel-lània Zoològica, 2016
Checklist of sharks, rays and chimaeras (Chondrichthyes, Elasmobranchii, Holocephali) from Mexico We present an annotated checklist of the species of sharks, rays and chimaeras (chondrichthyan fishes) occurring in Mexican waters, based on a thorough ...
Del Moral-Flores, L. F., Morrone, J. J., Alcocer Durand, J., Espinosa-Pérez, H., Pérez-Ponce De León, G.   +4 more
doaj  

Lamnoid vertebrae from the Agua Nueva Formation (Upper Cretaceous: lower Turonian), northeastern Mexico

Revista Mexicana de Ciencias Geológicas, 2018
A partial vertebral series of a lamniform shark (Chondrichthyes: Elasmobranchii) occurred in the “Vallecillo fish Member” of the Agua Nueva Formation (Upper Cretaceous: Lower Turonian) at Vallecillo, Mexico.
Alberto Blanco-Piñón, Kenshu Shimada, Gerardo González-Barba   +2 more
doaj  

A marginal marine fauna from the upper Dinosaur Park Formation, Canada

Vertebrate Anatomy, Morphology, Palaeontology
During the Late Cretaceous, the coastline of the epicontinental Western Interior Seaway in North America fluctuated in position, temporarily replacing some terrestrial ecosystems with shallow marine habitats.
Luke Nelson, Joshua Doyon, Alison Murray, Don Brinkman, Robert Holmes   +4 more
doaj   +1 more source

Length-weight relationship of 73 fish species caught in the southeastern inner continental shelf region of Brazil

Latin American Journal of Aquatic Research, 2014
The a and b parameters of the length-weight relationship (LWR) of the form W = aLb were estimated for 71 species of Actinopterygii and 2 Elasmobranchii, caught in the coastal region and inner shelf of southeastern Brazil. Estimates of b varied from 2.151
June F Dias, Wellington S Fernandez, Thassya C.S. Schmidt   +2 more
doaj  

Aspects of the reproductive biology of the shortfin mako, Isurus oxyrinchus (Elasmobranchii Lamnidae), in the Southeastern region of Brazil

Brazilian Journal of Biology, 2002
Uteri from four pregnant females and two newborn of shortfin mako, Isurus oxyrinchus, were collected in the southeastern region of Brazil, during September, October, and November of 1993 and 1994.
COSTA F. E. S., BRAGA F. M. S., ARFELLI C. A., AMORIM A. F.   +3 more
doaj  

Three-dimensional fossils of a Cretaceous collared carpet shark (Parascylliidae, Orectolobiformes) shed light on skeletal evolution in galeomorphs

Royal Society Open Science
A rich fossil record of teeth shows that many living shark families’ origins lie deep in the Mesozoic. Skeletal fossils of the sharks to whom these teeth belonged are far rarer and when they are preserved are often flattened, hindering understanding of ...
Richard P. Dearden, Zerina Johanson, Helen L. O’Neill, Kieran Miles, Emma L. Bernard, Brett Clark, Charlie J. Underwood, Martin Rücklin   +7 more
doaj   +1 more source

Allometric Growth and Scaling of Body Form of the Spadenose Shark (Scoliodon laticaudus)

Ecology and Evolution
The versatility of the shark body form is suggested to be one of the key factors underlying their evolutionary success and persistence. Nevertheless, sharks exhibit a huge diversity of body forms and morphological adaptations.
Joel H. Gayford, Ronak Waghe, Phillip C. Sternes, Zoya Tyabji   +3 more
doaj   +1 more source

Late Cretaceous coprolite from the Opole area (southern Poland) as evidence for a variable diet in shell-crushing shark <i>Ptychodus</i> (Elasmobranchii: Ptychodontidae). [PDF]

PeerJ, 2023
Mazurek D, Antczak M.
europepmc   +1 more source

The Phenomenon of Piebaldism in Sharks: A Review of Global Sightings and Patterns

Ecology and Evolution
Chromatic disorders in elasmobranchs (sharks and rays) have been reported in several species, but little is known about their true abundance or consequences for survival and fitness.
Darren A. Whitehead, Andrea Parmegiani, Jacopo Gobbato, Mohamed Mizyan, Arzucan Askin, Sara Scroglieri, Paolo Galli, Davide Seveso, Simone Montano, Joel H. Gayford   +9 more
doaj   +1 more source