Results 71 to 80 of about 1,690 (206)

Evidence for Placoderms from the Mid-Palaeozoic Sandon Beds of North-western New South Wales, Australia [PDF]

, 2023
Armoured jawed fishes known as placoderms are a well-documented group with a fossil record spanning the Silurian to end-Devonian. They have a global distribution and a marked diversity within Devonian deposits of Australia. Despite their notable Gondwanan
Bicknell, Russell DC, Hart, Lachlan J , Long, John A, Smith, Patrick M, Trinajstic, Kate M   +4 more
core   +2 more sources

Discriminating signal from noise in the fossil record of early vertebrates reveals cryptic evolutionary history [PDF]

, 2014
The fossil record of early vertebrates has been influential in elucidating the evolutionary assembly of the gnathostome bodyplan. Understanding of the timing and tempo of vertebrate innovations remains, however, mired in a literal reading of the fossil ...
Donoghue, Philip C J, Randle, Emma, Sansom, Robert   +2 more
core   +2 more sources

The Dermal Skeleton of Stem‐Actinopterygian Moythomasia durgaringa and Its Implications for the Nature of the Ancestral Osteichthyan

Journal of Morphology, Volume 287, Issue 3, March 2026.
The 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 ...
Xianren Shan, Edine Pape, Joseph N. Keating, Martin Rücklin, Davide Pisani, Philip C. J. Donoghue   +5 more
wiley   +1 more source

Vascularization and odontode structure of a dorsal ridge spine of Romundina stellina Ørvig 1975. [PDF]

PLoS ONE, 2017
There are two types of dermal skeletons in jawed vertebrates: placoderms and osteichthyans carry large bony plates (macromery), whereas chondrichthyans and acanthodians are covered by small scales (micromery).
Anna Jerve, Qingming Qu, Sophie Sanchez, Per Erik Ahlberg, Tatjana Haitina   +4 more
doaj   +1 more source

The Synarcual of the Little Skate, Leucoraja erinacea: Novel Development Among the Vertebrates

Frontiers in Ecology and Evolution, 2019
Evolutionary variation in anteroposterior patterning of the axial skeleton is a major contributor to the evolution of the vertebrate body plan, with five canonical vertebral types in tetrapods (cervical, thoracic, lumbar, sacral, caudal).
Zerina Johanson, Kyle Martin, Gareth Fraser, Katherine James   +3 more
doaj   +1 more source

Ichthyofauna from the lower devonian (lochkovian) deposits of the southwestern part of Belarus [PDF]

, 2015
Приводятся результаты палеоихтиологического изучения керна скважины Томашовка 11, даны исторические сведения по изучению нижнедевонской ихтиофауны в пределах юго-западной части ...
Plax, D. P.
core  

The braincase and jaws of a Devonian 'acanthodian' and modern gnathostome origins.

, 2009
Modern gnathostomes (jawed vertebrates) emerged in the early Palaeozoic era, but this event remains unclear owing to a scant early fossil record. The exclusively Palaeozoic acanthodians are possibly the earliest gnathostome group and exhibit a mosaic of ...
AM Basden, AM Basden, B Schaeffer, B Schaeffer, BG Gardiner, CJ Burrow, D Goujet, E Jarvik, E Stensiö, GC Young, GC Young, GF Hanke, GF Hanke, GJ Nelson, H-P Schultze, JG Maisey, JG Maisey, JG Maisey, M Friedman, M Zhu, Martin D. Brazeau, MM Smith, MVH Wilson, P Janvier, P-Y Gagnier, RF Miller, RS Miles, RS Miles, T Ørvig, Z Johanson   +29 more
core   +1 more source

Lungfish‐like antero‐labial tooth addition and amphibian‐like enameloid‐enamel transition in the coronoid of a Devonian stem actinopterygian

Journal of Anatomy, Volume 247, Issue 3-4, Page 418-441, September/October 2025.
The tooth patterning logic, which cannot be inferred from surface morphology, is revealed by visualizing buried tooth remnants in 3D. The primary teeth are added labially, initially organized in radial rows, which transition into linear rows where the coronoid becomes slender.
Donglei Chen
wiley   +1 more source

Paleo‐evo‐devo implications of a revised conceptualization of enameloids and enamels

Biological Reviews, Volume 100, Issue 3, Page 1047-1066, June 2025.
ABSTRACT Understanding the origin and evolution of the mineralized skeleton is crucial for unravelling vertebrate history. However, several limitations hamper our progress. The first obstacle is the lack of uniformity and clarity in the literature for the definition of the tissues of concern, especially of enameloid(s) and enamel(s), resulting in ...
Guillaume Houée, Nicolas Goudemand, Damien Germain, Jérémie Bardin   +3 more
wiley   +1 more source

A three‐dimensional placoderm (stem‐group gnathostome) pharyngeal skeleton and its implications for primitive gnathostome pharyngeal architecture [PDF]

, 2017
The pharyngeal skeleton is a key vertebrate anatomical system in debates on the origin of jaws and gnathostome (jawed vertebrate) feeding. Furthermore, it offers considerable potential as a source of phylogenetic data.
Atwood, Robert C., Brazeau, Martin D., Friedman, Matt, Jerve, Anna   +3 more
core   +1 more source