Results 101 to 110 of about 717 (179)

New morphological information on, and species of placoderm fish Africanaspis (Arthrodira, Placodermi) from the Late Devonian of South Africa.

PLoS ONE, 2017
Here we present a new species of placoderm fish, Africanaspis edmountaini sp. nov., and redescribe Africanaspis doryssa on the basis of new material collected from the type locality of Africanaspis.
Robert W Gess, Kate M Trinajstic
doaj   +1 more source

Fossil Musculature of the Most Primitive Jawed Vertebrates [PDF]

, 2013
The transition from jawless to jawed vertebrates (gnathostomes) resulted in the reconfiguration of the muscles and skeleton of the head, including the creation of a separate shoulder girdle with distinct neck muscles.
Ahlberg, Per, Long, John, Senden, T., Boisvert, Catherine, Power, N., Sanchez, Sophie, Young, G., Dupret, Vincent,, Ahlberg, Per Erik,, Sanchez, S., Dupret, V., Tafforeau, Paul, Senden, Tim, Sanchez, Sophie,, Dupret, Vincent, Power, Nicola, Young, Gavin, Boisvert, C., Ahlberg, P.E., Long, J., Tafforeau, P., Trinajstic, Kate, Ahlberg, Per Erik, Senden, Timothy   +23 more
core   +1 more source

Vertebrate Biostratigraphy of the Witteberg Group and the Devonian-Carboniferous boundary in South Africa

, 2016
Witteberg Group rocks are Late Devonian to Early Carboniferous in age. Comparison with Laurasian sea-level curves has correlated the earliest Carboniferous Tournasian transgression, with the argillaceous Kweekvlei Formation, overlying the arenaceous ...
Gess, Robert W, Robert W. Gess
core   +1 more source

Bioerosion in the Late Devonian placoderm remains from the Holy Cross Mountains, Poland

Acta Palaeontologica Polonica
We report the first occurrence of trace fossils in placoderm bones from the Upper Devonian of the Holy Cross Mountains. A taxonomic analysis of three ichnogenera revealed the earliest evidence of Sulculites (ie., Sulculites bellus), characterised by ...
Patrycja G. Dworczak, Piotr Szrek, Olga Wilk   +2 more
doaj   +1 more source

Copulation in antiarch placoderms and the origin of gnathostome internal fertilization

, 2015
Reproduction in jawed vertebrates (gnathostomes) involves either external or internal fertilization1. It is commonly argued that internal fertilization can evolve from external, but not the reverse.
J. Long (2926500), M. Newman (11961290), E. Mark-Kurik (23371873), M. Lee (6332354), R. Jones (3979994), B. Choo (23371879), Katherine Trinajstic (23319427), P. Ahlberg (23325220), J. den Blaauwen (23371876), G. Young (3523955), Z. Min (23362453), Z. Johanson (23307619)   +11 more
core  

An antiarch placoderm shows that pelvic girdles arose at the root of jawed vertebrates

, 2012
Almost all gnathostomes or jawed vertebrates (including osteichthyans, chondrichthyans, \u27acanthodians\u27 and most placoderms) possess paired pectoral and pelvic fins.
Liantao Jia, Min Zhu, Zhu, Min, Junqing Wang, Wang, Junqing, Yu, Xiaobo, Jia, Liantao, Brian Choo, Choo, Brian, Xiaobo Yu   +9 more
core   +1 more source

Development of teeth and jaws in the earliest jawed vertebrates

, 2012
Teeth and jaws constitute a model of the evolutionary developmental biology concept of modularity and they have been considered the key innovations underpinning a classic example of adaptive radiation. However, their evolutionary origins are much debated.
Zerina Johanson, Stampanoni, M., Stampanoni, Marco, Ruecklin, Martin, Kate Trinajstic, Johanson, Z., Rucklin, M., Federica Marone, Donoghue, P., Trinajstic, Katherine, Philip C. J. Donoghue, Marone, F., Marco Stampanoni, Martin Rücklin, Marone, Federica, Donoghue, Philip C J, Johanson, Zerina, Trinajstic, Kate, Rücklin, Martin, Donoghue, Philip C. J.   +19 more
core   +2 more sources

Fossil evidence for a pharyngeal origin of the vertebrate pectoral girdle. [PDF]

Nature, 2023
Brazeau MD, Castiello M, El Fassi El Fehri A, Hamilton L, Ivanov AO, Johanson Z, Friedman M.   +6 more
europepmc   +1 more source

Intra‐terrestrial aliens—Visualizing the bizarre cranial anatomy of the worm‐lizard!

The Anatomical Record, Volume 307, Issue 3, Page 533-534, March 2024.
Adam Hartstone‐Rose
wiley   +1 more source

A simplified phylogeny of jawed vertebrates modified from Brazeau [14].

, 2013
‘Placoderms’ and ‘Acanthodians’ are extinct, probably paraphyletic, groups. Representative scales of osteichthyans (Cheirolepis), acanthodians (Nostolepis), stem chondrichthyans (Cladoselache) and ‘placoderms’ (Ohiolepis) are modified from [52], [53 ...
Paul Tafforeau (118114), Henning Blom (443686), Sophie Sanchez (83642), Per Erik Ahlberg (443685), Qingming Qu (327698)   +4 more
core   +1 more source