Results 21 to 30 of about 8,625 (225)

Species diversity, taxonomy and distribution of Chondrichthyes in the Mediterranean and Black Sea

The European Zoological Journal, 2020
Species diversity assessments are an important step to evaluate the conservation status of a community, both in marine and terrestrial ecosystems. These assessments are pivotal if related to both, the constant increase of human pressure on ecosystems and
F. Serena, Á. Abella, F. Bargnesi, M. Barone, F. Colloca, F. Ferretti, F. Fiorentino, J. Jenrette, S. Moro   +8 more
semanticscholar   +1 more source

The Development of the Chimaeroid Pelvic Skeleton and the Evolution of Chondrichthyan Pelvic Fins

Journal of Developmental Biology, 2022
Pelvic girdles, fins and claspers are evolutionary novelties first recorded in jawed vertebrates. Over the course of the evolution of chondrichthyans (cartilaginous fish) two trends in the morphology of the pelvic skeleton have been suggested to have ...
Jacob B. Pears, Carley Tillett, Rui Tahara, Hans C. E. Larsson, Kate Trinajstic, Catherine A. Boisvert   +5 more
doaj   +1 more source

Drivers of diversification in sharks and rays (Chondrichthyes: Elasmobranchii). [PDF]

Front Ecol Evol
Elasmobranchs (sharks and rays) are a charismatic lineage of unquestionable ecological importance in past and present marine ecosystems. Represented by over 1200 species, elasmobranchs have undergone substantial shifts in taxonomic diversity since their ...
Gayford JH, Jambura PL.
europepmc   +2 more sources

A Comparison of the Innate and Adaptive Immune Systems in Cartilaginous Fish, Ray-Finned Fish, and Lobe-Finned Fish

Frontiers in Immunology, 2019
The immune system is composed of two subsystems—the innate immune system and the adaptive immune system. The innate immune system is the first to respond to pathogens and does not retain memory of previous responses.
Nicole C. Smith, Matthew L. Rise, Sherri L. Christian   +2 more
doaj   +1 more source

Two new species of freshwater stingrays of the genus Paratrygon (Chondrichthyes: Potamotrygonidae) from the Orinoco basin, with comments on the taxonomy of Paratrygon aiereba

, 2021
The genus Paratrygon, currently recognized as the sole monotypic genus of the family Potamotrygonidae, has a considerably greater diversity than previously indicated, including molecular studies, which supported P.
T. S. Loboda, C. Lasso, R. Rosa, M. R. Carvalho   +3 more
semanticscholar   +1 more source

Eugenol and Lippia alba essential oils as effective anesthetics for the Amazonian freshwater stingray Potamotrygon wallacei (Chondrichthyes, Potamotrygonidae)

Fish Physiology & Biochemistry, 2021
This study assessed the potential of eugenol and the essential oil of Lippia alba (EOLA) in providing suitable anesthetic induction and recovery times, and their consequent effects on the blood and respiratory physiology, as well as the gill architecture
C. L. de Lima, Ruben Dario Morales-Gamba, Thiago Santana Malcher Neto, J. M. Barcellos, B. Heinzmann, Denise Schmidt, B. Baldisserotto, J. Marcon   +7 more
semanticscholar   +1 more source

Size of catch, reproduction and feeding of the small-eye smooth-hound, Mustelus higmani (Carcharhiniformes: Triakidae), in Margarita Island, Venezuela

Scientia Marina, 2015
Mustelus higmani is categorized as “least concern” according to the red list of the International Union for Conservation of Nature, but gaps in population trends occur in most of its distribution range.
Alejandro Tagliafico, Iván Hernández-Ávila, Salomé Rangel, Néstor Rago   +3 more
doaj   +1 more source

New Late Cretaceous microvertebrate assemblage from the Campanian–Maastrichtian Williams Fork Formation, northwestern Colorado, USA, and its paleoenvironmental implications

Acta Palaeontologica Polonica, 2022
We describe a microvertebrate assemblage from the J&M site, of the Upper Cretaceous (Campanian–Maastrichtian) Williams Fork Formation. Breakdown of fossil bearing matrix was achieved with the use of heated dimethyl sulfoxide.
NICKOLAS A. BRAND, ANDREW B. HECKERT, ISRAEL SANCHEZ, JOHN R. FOSTER, REBECCA K. HUNT-FOSTER, JAELYN J. EBERLE   +5 more
doaj   +1 more source

Langhian rays (Chondrichthyes, Batomorphii) from Brielas, Lower Tagus Basin, Portugal

Geologica Acta, 2019
The Langhian Vc unit of Brielas section (Caparica road, Almada), in the marine Miocene of the Lower Tagus Basin (West Portugal), is rich in batoid species.
P. FIALHO, A. BALBINO, M.T. ANTUNES
doaj   +1 more source

The complete mitochondrial genome of the deep-water cartilaginous fish Hydrolagus affinis (de Brito Capello, 1868) (Holocephali: Chimaeridae)

Mitochondrial DNA. Part B. Resources, 2020
Cartilaginous fishes are a highly vulnerable vertebrate group but remain poorly studied, especially those occupying deep-water ecological niches. Here, we describe the complete mitogenome of the deep-water chimaeriform Hydrolagus affinis (de Brito ...
André Gomes-dos-Santos, Nair Vilas Arrondo, André M. Machado, Ana Veríssimo, Montse Pérez, Esther Román, L. Filipe C. Castro, Elsa Froufe   +7 more
doaj   +1 more source