Results 21 to 30 of about 1,233 (179)

Squaloraja Riley 1833 (Holocephala: Squalorajidae) from the Lower Jurassic of Osteno Konservat-Lagerstätte (Como, NW Italy)

Natural History Sciences, 2023
A remarkable, complete specimen of a squalorajid holocephalian is described for the first time from the Lower Jurassic (lower Sinemurian) rocks of Osteno (Como, NW Italy).
Christopher J. Duffin, Alessandro Garassino, Giovanni Pasini   +2 more
doaj   +1 more source

Characterization of Gonadotropin-Releasing Hormone (GnRH) Genes From Cartilaginous Fish: Evolutionary Perspectives

Frontiers in Neuroscience, 2018
The neuropeptide gonadotropin-releasing hormone (GnRH) plays an important role in the control of reproductive functions. Vertebrates possess multiple GnRH forms that are classified into three main groups, namely GnRH1, GnRH2, and GnRH3.
Anne-Laure Gaillard, Boon-Hui Tay, Daniela I. Pérez Sirkin, Anne-Gaëlle Lafont, Céline De Flori, Paula G. Vissio, Sylvie Mazan, Sylvie Dufour, Byrappa Venkatesh, Hervé Tostivint   +9 more
doaj   +1 more source

Mineralization of the Callorhinchus Vertebral Column (Holocephali; Chondrichthyes)

Frontiers in Genetics, 2020
Members of the Chondrichthyes (Elasmobranchii and Holocephali) are distinguished by their largely cartilaginous endoskeletons, which comprise an uncalcified core overlain by a mineralized layer; in the Elasmobranchii (sharks, skates, rays) most of this ...
Jacob B. Pears, Zerina Johanson, Kate Trinajstic, Mason N. Dean, Catherine A. Boisvert   +4 more
doaj   +1 more source

Species diversity of critically endangered pristid sawfishes (Elasmobranchii: Pristidae) Elasmobranchii: Pristidae (Malay Archipelago)

Biodiversitas Journal of Biological Diversity, 1970
Sutarno, Setyawan AD, Suyatna I. 2012. Species diversity of critically endangered pristid sawfishes (Elasmobranchii: Pristidae) Elasmobranchii: Pristidae (Malay Archipelago). Biodiversitas 13: 161-171. The pristid sawfishes (Pristidae) are notable because of their sawlike rostrum and large body size (up to seven meters).
SUTARNO SUTARNO, AHMAD SETYAWAN, IWAN SUYATNA   +2 more
openaire   +1 more source

Beneath the surface: DNA barcoding of shark fins in Singapore

Royal Society Open Science
The global decline of shark populations, largely driven by overfishing to supply the shark fin trade, poses a significant threat to marine ecosystems. Southeast Asia, and particularly Singapore, is a key hub for the transit and trade of shark fins that ...
Manisha Saigal, Hannah Ng Shueh Yi, Nageen Ayesha Rameez, Siebe van Manen, Bui Tr Van Anh, Vidhi P. Arora, Kai Ding Max Han, Jenelle Qian Tong Lee, Adlan Syaddad, Claudia Kexin Tan, Elisa X. Y. Lim, Benjamin J. Wainwright   +11 more
doaj   +1 more source

The oldest shark face—anatomy of the Devonian elasmobranch Phoebodus

Acta Palaeontologica Polonica
Phoebodus was recognized as the earliest elasmobranch known from articulated remains, a group which constitutes most modern cartilaginous fish comprising sharks, skates and rays. Its elongate body, the presence of two dorsal fins with fin spines, and the
Christian Klug, Merle Greif, Alexander Pohle, Michał Ginter, Michael I. Coates, Wahiba Bel Haouz, Abdelouahed Lagnaoui, Jonathan Pople, Linda Frey   +8 more
doaj   +1 more source

Fish remains from Miocene beds of Višnja vas near Vojnik, Slovenia

Geologija, 2013
This paper discusses fossil teeth of sharks (Elasmobranchii, Neoselachii) and porgies (Teleostei, Sparidae) fromthe Miocene glauconite sandstones of Vi{nja vas near Vojnik.
Aleš Šoster, Vasja MIkuž
doaj   +1 more source

Review of the dental pattern in the squalomorph shark Protospinax annectans , and a description of two new Jurassic shark genera

Acta Palaeontologica Polonica
The extinct elasmobranch Protospinax is an intriguing shark known mostly from isolated teeth and rare complete skeletons. Most previous studies focused on differences in isolated teeth for taxonomic assignments, with little to no considerations of dental
Arnaud Begat, Eduardo Villalobos-Segura, Patrick L. Jambura, Manuel A. Staggl, Stefanie Klug, Jürgen Kriwet   +5 more
doaj   +1 more source

Morphological Variability and Function of Labial Cartilages in Sharks (Chondrichthyes, Elasmobranchii)

Biology, 2023
(1) Background: Labial cartilages (LCs), as their name suggests, lie in the folds of the connective tissue, the lips, framing the gape of elasmobranch chondrichthyans. As such, these cartilages lie laterally to the jaws and marginal teeth. They are considered to influence the ability of creating suction during the feeding process.
Klimpfinger, Claudia, Kriwet, Jürgen
openaire   +4 more sources

First record of Multicalyx cristata (Aspidocotylea) in Sphyrna lewini (Elasmobranchii) in the southern Gulf of Mexico

Revista Mexicana de Biodiversidad, 2017
Three individuals of Multicalyx cristata (Aspidocotylea) were identified in the gallbladder of a hammerhead shark, Sphyrna lewini (Elasmobranchii), in Playa Chachalacas, Veracruz, Mexico. This report makes a significant contribution to our understanding
Oscar Méndez, Víctor M. Vidal-Martínez   +1 more
doaj   +1 more source