Results 71 to 80 of about 696 (179)

The lower jaw of Devonian ray‐finned fishes (Actinopterygii): Anatomy, relationships, and functional morphology

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, Rodrigo Tinoco Figueroa, Robert R. Higgins, Stephanie E. Pierce, Michael I. Coates, Emily M. Troyer, Vincent Fernandez, Kathleen Dollman, Jing Lu, Min Zhu, Matt Friedman, Sam Giles   +11 more
wiley   +1 more source

Fig. 11 in Groenlandaspidid Placoderm Fishes from the Late Devonian of North America

, 2003
Fig. 11. Reconstructed headshield, lateral platesPublished as part of Daeschler, Edward B., Frumes, Anna C. & Mullison, C. Frederick, 2003, Groenlandaspidid Placoderm Fishes from the Late Devonian of North America, pp.
Daeschler, Edward B., Mullison, C. Frederick, Frumes, Anna C.   +2 more
core   +1 more source

Fossilized ontogenies: The contribution of placoderm ontogeny to our understanding of the evolution of early gnathostomes

, 2014
Placoderms, representing phylogenetically more inclusive jawed vertebrates and successive sister taxa to crown-group gnathostomes, are critical to our understanding of character evolution within the crown-group (chondrichthyans + osteichthyans ...
Johanson, Z., Trinajstic, Katherine
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

Investigating the Morphogenesis and Replacement of Lamprey Toothlets Using Synchrotron Imaging

Journal of Morphology, Volume 286, Issue 10, October 2025.
Toothlet replacement is a conserved feature in lampreys. We describe the mechanism at tissue level and quantify the determining factors, thus providing the basis for studies into a deep homology of cyclostome toothlets and gnathostome teeth. ABSTRACT Teeth are a key innovation that underpinned the adaptive radiation of jawed vertebrates; however, their
Madleen Grohganz, Jake Leyhr, Zerina Johanson, Tatjana Haitina, Sophie Sanchez, Kathleen Dollman, Jan Stundl, Marianne E. Bronner, Gareth J. Fraser, Philip C. J. Donoghue   +9 more
wiley   +1 more source

Fig. 12 in Groenlandaspidid Placoderm Fishes from the Late Devonian of North America

, 2003
Fig. 12. Methods for deriving measurements of isolated trunk elements and head shields presented in Appendix 1 and 2.Published as part of Daeschler, Edward B., Frumes, Anna C. & Mullison, C.
Daeschler, Edward B., Mullison, C. Frederick, Frumes, Anna C.   +2 more
core   +1 more source

Oligodendrogenesis in Evolution, Development and Adulthood

Glia, Volume 73, Issue 9, Page 1770-1783, September 2025.
Main Points Oligodendrocytes and myelin took shape in jawed vertebrates During development, OPCs are originated from NSCs and then undergo differentiation into mature oligodendrocytes that supply myelin. OPCs persist in the adult CNS and continue to produce oligodendrocytes and myelin.
Hao Hu, Tianhao Gao, Jingwei Zhao, Huiliang Li   +3 more
wiley   +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

Three-dimensional paleohistology of the scale and median fin spine of Lophosteus superbus (Pander 1856) [PDF]

PeerJ, 2016
Lophosteus superbus is one of only a handful of probable stem-group osteichthyans known from the fossil record. First collected and described in the late 19th century from the upper Silurian Saaremaa Cliff locality in Estonia, it is known from a wealth ...
Anna Jerve, Qingming Qu, Sophie Sanchez, Henning Blom, Per Erik Ahlberg   +4 more
doaj   +2 more sources

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