Results 91 to 100 of about 2,860 (207)

Secondary Folds Contribute Significantly to the Total Surface Area in the Olfactory Organ of Chondrichthyes

Frontiers in Physiology, 2019
The olfactory organ of Chondrichthyes is characterized by a central support with several lamellae covered by a sensory olfactory epithelium. Although secondary folds are present on the lamellae in all the chondrichthyan species analyzed to date, their ...
Sara Ferrando, Andrea Amaroli, Andrea Amaroli, Lorenzo Gallus, Stefano Aicardi, Davide Di Blasi, Jørgen S. Christiansen, Jørgen S. Christiansen, Marino Vacchi, Laura Ghigliotti   +9 more
doaj   +1 more source

A complete protocol for the preparation of chondrichthyan skeletal specimens

, 2016
International audienceThe skeleton of cartilaginous fishes is notoriously difficult to prepare, and the literature dealing with the subject is extremely rare compared to other vertebrate groups.
Enault, S., Debiais-Thibaud, M., Auclair, C., C., Auclair, C.,, Adnet, Sylvain   +4 more
core   +1 more source

First shark from the Late Devonian (Frasnian) Gogo Formation, Western Australia sheds new light on the development of tessellated calcified cartilage.

PLoS ONE, 2015
BACKGROUND:Living gnathostomes (jawed vertebrates) comprise two divisions, Chondrichthyes (cartilaginous fishes, including euchondrichthyans with prismatic calcified cartilage, and extinct stem chondrichthyans) and Osteichthyes (bony fishes including ...
John A Long, Carole J Burrow, Michal Ginter, John G Maisey, Kate M Trinajstic, Michael I Coates, Gavin C Young, Tim J Senden   +7 more
doaj   +1 more source

Evolution of dental tissue mineralization: an analysis of the jawed vertebrate SPARC and SPARC-L families

BMC Evolutionary Biology, 2018
Background The molecular bases explaining the diversity of dental tissue mineralization across gnathostomes are still poorly understood. Odontodes, such as teeth and body denticles, are serial structures that develop through deployment of a gene ...
Sébastien Enault, David Muñoz, Paul Simion, Stéphanie Ventéo, Jean-Yves Sire, Sylvain Marcellini, Mélanie Debiais-Thibaud   +6 more
doaj   +1 more source

Sharks, Rays and a Chimaeroid from the Kimmeridgian (Late Jurassic) of Ringstead, Southern England [PDF]

, 2002
Sampling of a lenticular concentration of vertebrate debris and associated sediments from the lower Kimmeridgian of southern England has allowed the study of a diverse and abundant assemblage of chondrichthyan remains.
Underwood, Charlie J.
core   +1 more source

First elucidation of a blood fluke (Electrovermis zappum n. gen., n. sp.) life cycle including a chondrichthyan or bivalve

International Journal for Parasitology: Parasites and Wildlife, 2019
We describe a new fish blood fluke (Digenea: Aporocotylidae: Electrovermis zappum n. gen., n. sp.) and its life cycle in the intertidal zone adjacent to Mobile Bay (north-central Gulf of Mexico).
Micah B. Warren, Stephen A. Bullard
doaj   +1 more source

Rise and diversification of chondrichthyans in the Paleozoic

Paleobiology
Abstract The Paleozoic represents a key time interval in the origins and early diversification of chondrichthyans (cartilaginous fishes), but their diversity and macroevolution are largely obscured by heterogenous spatial and temporal sampling.
Lisa Schnetz, Emma M. Dunne, Iris Feichtinger, Richard J. Butler, Michael I. Coates, Ivan J. Sansom   +5 more
openaire   +1 more source

Oldest near-complete acanthodian: the first vertebrate from the Silurian Bertie Formation Konservat-Lagerstätte, Ontario.

PLoS ONE, 2014
BackgroundThe relationships between early jawed vertebrates have been much debated, with cladistic analyses yielding little consensus on the position (or positions) of acanthodians with respect to other groups.
Carole J Burrow, David Rudkin
doaj   +1 more source

Karksilepis parva gen. et sp. nov. (Chondrichthyes) from the Burtnieki Regional Stage, Middle Devonian of Estonia [PDF]

Estonian Journal of Earth Sciences, 2008
Dermal scales of a new chondrichthyan were discovered in four levels in sandstones of the Härma Beds (lower part of the Burtnieki Regional Stage, Middle Devonian) in the Karksi outcrop of South Estonia. The classification of Karksilepis parva gen. et sp.
Kleesment, Anne, Märs, Tiiu, Niit, Moonika   +2 more
doaj  

A Paleogene chondrichthyan assemblage from central Chile supports a latitudinal and temporal boundary of the Weddellian Province along the southeastern Pacific

Acta Palaeontologica Polonica
The locality of Algarrobo in central Chile, has yielded a rich Late Cretaceous fossil assemblage that enriched the knowledge of the vertebrate diversity in the context of the Weddellian Biogeographic Province, by providing midlatitude records comparable ...
Rodrigo A. Otero, Sergio Soto-Acuña, Raúl Ugalde P., Héctor Ortiz   +3 more
doaj   +1 more source