Results 61 to 70 of about 643 (178)
The Anatomical Record, Volume 309, Issue 3, Page 550-602, March 2026.Abstract Actinopterygii is a major extant vertebrate group, but limited data are available for its earliest members. Here we investigate the morphology of Devonian actinopterygians, focusing on the lower jaw. We use X‐ray computed tomography (XCT) to provide comprehensive descriptions of the mandibles of 19 species, which span the whole of the Devonian
Ben Igielman +11 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 +4 more
doaj +1 more source
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 +5 more
wiley +1 more source
Romundina and the evolutionary origin of teeth [PDF]
, 2015 Theories on the origin of vertebrate teeth have long focused on chondrichthyans as reflecting a primitive condition-but this is better informed by the extinct placoderms, which constitute a sister clade or grade to the living gnathostomes.
Rucklin, Martin, Donoghue, Philip C J
core +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 +3 more
doaj +1 more source
Ecomorphological inferences in early vertebrates: reconstructing Dunkleosteus terrelli (Arthrodira, Placodermi) caudal fin from palaeoecological data [PDF]
PeerJ, 2017 Our knowledge about the body morphology of many extinct early vertebrates is very limited, especially in regard to their post-thoracic region. The prompt disarticulation of the dermo-skeletal elements due to taphonomic processes and the lack of a well ...
Humberto G. Ferrón +2 more
doaj +2 more sources
Loss in the making: absence of pelvic fins and presence of paedomorphic pelvic girdles in a Late Devonian antiarch placoderm (jawed stem-gnathostome). [PDF]
Biol Lett, 2018 Within jawed vertebrates, pelvic appendages have been modified or lost repeatedly, including in the most phylogenetically basal, extinct, antiarch placoderms.
Charest F, Johanson Z, Cloutier R.
europepmc +2 more sources
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
Placoderm interrelationships: a new interpretation, with a short review of placoderm classifications
, 1984 (Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire +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 +3 more
wiley +1 more source