Results 11 to 20 of about 338 (111)

A Devonian Fish Tale: A New Method of Body Length Estimation Suggests Much Smaller Sizes for Dunkleosteus terrelli (Placodermi: Arthrodira)

open access: yesDiversity, 2023
Dunkleosteus terrelli, an arthrodire placoderm, is one of the most widely recognized fossil vertebrates due to its large size and status as one of the earliest vertebrate apex predators.
Russell K. Engelman
doaj   +4 more sources

An examination of the Devonian fishes of Michigan. [PDF]

open access: yesPeerJ, 2018
We surveyed the taxa, ecosystems, and localities of the Devonian fishes of Michigan to provide a framework for renewed study, to learn about the diversity and number of these fishes, and to investigate their connection to other North American faunas ...
Stack J, Sallan L.
europepmc   +3 more sources

New findings in a 400 million-year-old Devonian placoderm shed light on jaw structure and function in basal gnathostomes. [PDF]

open access: yesSci Rep, 2017
Arthodire placoderms have been proposed as the sister group of Chinese 'maxillate' placoderms plus all the more crownward gnathostomes. These basal groups provide key information for understanding the early evolution of jaws.
Hu Y, Lu J, Young GC.
europepmc   +3 more sources

The internal cranial anatomy of Romundina stellina Ørvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome. [PDF]

open access: yesPLoS One, 2017
Placoderms are considered as the first jawed vertebrates and constitute a paraphyletic group in the stem-gnathostome grade. The acanthothoracid placoderms are among the phylogenetically most basal and morphologically primitive gnathostomes, but their ...
Dupret V   +3 more
europepmc   +3 more sources

A new selenosteid placoderm from the Late Devonian of the eastern Anti-Atlas (Morocco) with preserved body outline and its ecomorphology [PDF]

open access: yes, 2022
Placoderms are an extinct group of early jawed vertebrates that play a key role in understanding the evolution of the gnathostome body plan, including the origin of novelties such as jaws, teeth, and pelvic fins.
Ferrón, Humberto G.   +3 more
core   +3 more sources

New finds of fishes in the lower uppermost Famennian (Upper Devonian) of Сentral Russia and habitats of the Khovanshchinian vertebrate assemblages [PDF]

open access: yesEstonian Journal of Earth Sciences, 2018
New vertebrate finds from the Khovanshchinian Regional Stage (lower uppermost Famennian, Upper Devonian) made an important contribution to our knowledge of the composition and distribution of vertebrate assemblages in Central Russia.
Oleg A. Lebedev   +3 more
doaj   +1 more source

Structure, Growth and Histology of Gnathal Elements in Dunkleosteus (Arthrodira, Placodermi), with a Description of a New Species from the Famennian (Upper Devonian) of the Tver Region (North-Western Russia)

open access: yesDiversity, 2023
A new species of Dunkleosteus, D. tuderensis sp. nov., is named based on an infragnathal from the Famennian of the Tver Region, Russia. CT scanning of the holotype revealed two high-density bony constituents comparable in position and interrelations to ...
Oleg A. Lebedev   +7 more
doaj   +1 more source

Extreme lower jaw elongation in a placoderm reflects high disparity and modularity in early vertebrate evolution. [PDF]

open access: yesR Soc Open Sci
Jaws are a key vertebrate feature that arose early in our evolution. Placoderms are among the first jawed vertebrates; their fossils yield essential knowledge about the early diversification of gnathostome feeding strategies, diets and modularity ...
Jobbins M   +6 more
europepmc   +3 more sources

First articulated phyllolepid placoderm from North America, with comments on phyllolepid systematics [PDF]

open access: yes, 2013
Copyright 2013 The Academy of Natural Sciences of Philadelphia. Published version of the paper reproduced here with permission from the publisher.The first articulated phyllolepid placoderm from North America (outside of Greenland) is described from the ...
Daeschler, EB, Long, John A
core   +1 more source

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

open access: yes, 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 D C   +4 more
core   +3 more sources

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