Results 161 to 170 of about 8,625 (225)

On the relationships of the Petalodontiformes (Chondrichthyes)

Paleontological Journal, 2014
The Petalodontiformes are Upper Paleozoic marine euchondrocephalan chondrichthyans known primarily from isolated teeth. Few dentitions have been reported, among them that of the Permian Janassa bituminosa and “Janassa” korni and the Serpukhovian, Mississippian Belantsea montana, Obruchevodus griffithi, Netsepoye hawesi and Siksika ottae.
R. Lund, E. D. Grogan, M. Fath
openaire   +1 more source

The effect of bottom trawl fishery on biomass variations of demersal chondrichthyes in the eastern Mediterranean

, 2020
Chondrichthyan species are considered highly susceptible to fishing activities and as “indicator species” for overfishing and ecosystem stability.
P. Peristeraki, G. Tserpes, S. Kavadas, A. Kallianiotis, K. I. Stergiou   +4 more
semanticscholar   +1 more source

Mercury contamination in the recently described Brazilian white-tail dogfish Squalus albicaudus (Squalidae, Chondrichthyes).

Chemosphere, 2020
The recently described Squalus albicaudus is a mesopredator shark and, as such, exposed to mercury biomagnification processes. Therefore, this study aimed to assess total Hg (THg) concentrations in S.
R. Hauser‑Davis, Camila Ferreira Pereira, F. Pinto, J. Torres, O. Malm, M. Vianna   +5 more
semanticscholar   +1 more source

Evolution of the dentition in holocephalans (Chondrichthyes) through tissue disparity.

Integrative and Comparative Biology, 2020
The Holocephali is a major group of chondrichthyan fishes, the sister taxon to the sharks and rays (Elasmobranchii). However, the dentition of extant holocephalans is very different from that of the elasmobranchs, lacking individual tooth renewal, but ...
Z. Johanson, E. Manzanares, C. Underwood, B. Clark, V. Fernandez, Moya M. Smith   +5 more
semanticscholar   +1 more source

II CHONDRICHTHYES, Knorpelfische

2014
Die uber 1 200 Arten der Knorpelfische sind nur etwa 4 % aller heute lebenden Fischarten. Ihr knorpeliges Endoskelett kann zwar verkalken, wird aber nie zu Knochen umgebaut. Der Schadel besteht nur aus Neurocranium und Viscerocranium, ein Dermatocranium fehlt.
Wilfried Westheide, Gunde Rieger
openaire   +1 more source

Cartilaginous fishes (Chondrichthyes)

2009
Abstract Living members of the Subclasses Holocephali (chimaeras, including ratAshes, spookAshes, and rabbitAshes, 43 sp.) and Elasmobranchii (sharks, rays, skates, sawAshes, and guitarAshes, 1125 sp.) together comprise the extant representatives of the Class Chondrichthyes (cartilaginous Ashes) (1).
Matthew P Heinickea, Gavin J P Naylorb, S Blair Hedgesa   +2 more
openaire   +1 more source

The catshark genus Scyliorhinus (Chondrichthyes: Carcharhiniformes: Scyliorhinidae): taxonomy, morphology and distribution.

Zootaxa, 2019
The catshark genus Scyliorhinus belongs to the family Scyliorhinidae, the most diverse family of sharks, and currently presents 16 valid species according to most modern accounts.
Karla D. A. Soares, M. R. Carvalho
semanticscholar   +1 more source

The coracoid bar and its phylogenetic importance for elasmobranchs (Chondrichthyes)

, 2020
In a seminal study on elasmobranch systematics, Maisey proposed the monophyly of a large lineage of sharks based primarily on the sharing of an orbitostylic jaw suspension.
João Paulo Capretz Batista da Silva, A. Datovo   +1 more
semanticscholar   +1 more source

A review of the ecological role of the Neotropical freshwater stingrays (Chondrichthyes: Potamotrygoninae)

Food Webs, 2022
Akemi Shibuya
semanticscholar   +1 more source

Deep Chondrichthyes in Mauritanian Waters

2017
This study analyses the sampling of 22,118 individuals and 24 tons of demersal elasmobranches caught at 243 trawling stations during four Maurit surveys , which sampled Mauritanian waters, from 84 to 1835 m depth. We identified a total of 48 different species belonging to 17 families .
Pedro J. Pascual˗Alayón, Carlos Hernández, Manuel Hidalgo, Miguel Ángel Puerto   +3 more
openaire   +1 more source