Results 21 to 30 of about 5,320 (221)
Diversity, 2023 The Late Jurassic-Early Cretaceous (164–100 Ma) represents one of the main transitional periods in life history. Recent studies unveiled a complex scenario in which abiotic and biotic factors and drivers on regional and global scales due to the ...
Eduardo Villalobos-Segura +7 more
doaj +1 more source
A new chondrichthyan fauna from the Late Jurassic of the Swiss Jura (Kimmeridgian) dominated by hybodonts, chimaeroids and guitarfishes [PDF]
, 2017 The fossil record of chondrichthyans (sharks, rays and chimaeroids) principally consists of isolated teeth, spines and dermal denticles, their cartilaginous skeleton being rarely preserved.
Billon Bruyat, Jean Paul +3 more
core +3 more sources
Comparative genomics of chondrichthyan Hoxa clusters [PDF]
BMC Evolutionary Biology, 2009 Les poissons chondrichtyens ou cartilagineux (chimères, requins, raies et raies) occupent une position phylogénétique importante en tant que groupe sœur de tous les autres vertébrés à mâchoires et en tant que lignée précoce pour diverger de la lignée des vertébrés à la suite de deux événements de duplication du génome entier dans l'évolution des ...
John F. Mulley +2 more
openaire +4 more sources
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 +2 more
core +1 more source
Koedoe: African Protected Area Conservation and Science, 2000 This work summarises ichthyological research in the Tsitsikamma National Park (TNP) over the past 20 years, and an updated species check list of fishes has been compiled.
A.D. Wood +3 more
doaj +1 more source
Strengthening Angel Shark Conservation in the Northeastern Mediterranean Sea
Journal of Marine Science and Engineering, 2022 Angel sharks are among the most threatened species of sharks globally. Twenty-two species have been identified globally so far, with three species being present in the Mediterranean Sea: Squatina aculeata, Squatina oculata, and Squatina squatina.
Ioannis Giovos +16 more
doaj +1 more source
Diversity, 2023 Fishery impacts pose threats not only to target species, but also to bycatch species. Nevertheless, choosing priorities for conservation or research in fisheries is often driven by economic value and most retained bycatch species such as sharks and rays ...
Marcelo Reis, Will F. Figueira
doaj +1 more source
Características histológicas del útero de Sympterygia acuta (Garman, 1877) y Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes; Rajidae) [PDF]
, 2013 Los condrictios constituyen un clado sumamente conservado y vulnerable a la explotación, que ha cobrado una importancia creciente en los últimos años. Sin embargo, existe poca información sobre los aspectos morfológicos relacionados con la reproducción ...
Díaz Andrade, María Constanza +2 more
core +1 more source
Smart sharks: a review of chondrichthyan cognition
Animal Cognition, 2022 Abstract450 million years of evolution have given chondrichthyans (sharks, rays and allies) ample time to adapt perfectly to their respective everyday life challenges and cognitive abilities have played an important part in that process. The diversity of niches that sharks and rays occupy corresponds to matching diversity in brains and behaviour, but ...
Culum Brown, Vera Schluessel
openaire +2 more sources
The Dermal Skeleton of Stem-Actinopterygian Moythomasia durgaringa and Its Implications for the Nature of the Ancestral Osteichthyan. [PDF]
J MorpholThe figure presents a model of Moythomasia and a schematic histological model illustrating the internal structure and features of the cranial bones. These include bone (brown), osteocyte spaces (red), spheritic bone (light brown), osteon spaces (orange), dentine and canaliculi (green), pulp canal (yellow), ganoine (gray), arrested growth lines (dashed ...
Shan X +5 more
europepmc +2 more sources