Results 11 to 20 of about 696 (179)

The evolutionary origins of streptophyte multicellularity. [PDF]

New Phytol
The phylogeny of streptophytes and the deep origin of branching filamentous growth. Summary Over their more than 1 billion years of evolutionary history, streptophytes have repeatedly transitioned between unicellular, simple multicellular and complex multicellular forms.
Darienko T, Kunz CF, Goldbecker ES, Endriulaitytė E, Bierenbroodspot MJ, Lorenz M, Irisarri I, Pröschold T, Bürstenbinder K, Buschmann H, de Vries J.   +10 more
europepmc   +2 more sources

The Bothriolepis (Placodermi, Antiarcha) material from the Valentia Slate Formation of the Iveragh Peninsula (middle Givetian, Ireland): Morphology, evolutionary and systematic considerations, phylogenetic and palaeogeographic implications. [PDF]

PLoS ONE, 2023
Material of the antiarch placoderm Bothriolepis from the middle Givetian of the Valentia Slate Formation in Iveragh Peninsula, Ireland, is described and attributed to a new species, B. dairbhrensis sp. nov.
Vincent Dupret, Hannah M Byrne, Nélia Castro, Øyvind Hammer, Kenneth T Higgs, Johan A Long, Grzegorz Niedźwiedzki, Martin Qvarnström, Iwan Stössel, Per E Ahlberg   +9 more
doaj   +4 more sources

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

Royal Society Open Science
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 ...
Melina Jobbins, Martin Rücklin, Marcelo R. Sánchez Villagra, Hervé Lelièvre, Eileen Grogan, Piotr Szrek, Christian Klug   +6 more
doaj   +2 more sources

Re-make, re-model: evolution and development of vertebrate cranial lateral lines. [PDF]

Biol Rev Camb Philos Soc
ABSTRACT Lateral lines are placodally derived mechanosensory systems on the heads and trunks of many aquatic vertebrates. There is evidence of lateral lines in the earliest known vertebrate fossils, and they exist in organisms with widely different craniofacial morphologies – including the presence or absence of jaws, external or internal nostrils, and
Venkataraman V, Lopez M, Prince VE, Coates MI.   +3 more
europepmc   +2 more sources

A large Middle Devonian eubrachythoracid ‘placoderm’ (Arthrodira) jaw from northern Gondwana [PDF]

Swiss Journal of Palaeontology, 2021
For the understanding of the evolution of jawed vertebrates and jaws and teeth, ‘placoderms’ are crucial as they exhibit an impressive morphological disparity associated with the early stages of this process.
Melina Jobbins, Martin Rücklin, Thodoris Argyriou, Christian Klug   +3 more
doaj   +2 more sources

New information on Brindabellaspis stensioi Young, 1980, highlights morphological disparity in Early Devonian placoderms [PDF]

Royal Society Open Science, 2018
Acid-prepared specimens of the placoderm Brindabellaspis stensioi (Early Devonian of New South Wales, Australia) revealed placoderm endocranial anatomy in unprecedented detail.
Benedict King, Gavin C. Young, John A. Long   +2 more
doaj   +2 more sources

Unique dental arrangement in a new species, Groenlandaspis howittensis (Placodermi, Arthrodira) from the Middle Devonian of Mount Howitt, Victoria, Australia. [PDF]

PeerJ
Well-preserved specimens of a new species of arthrodiran placoderm, Groenlandaspis howittensis sp. nov. (Middle Devonian of Victoria, Australia), reveals previously unknown information on the dermal skeleton, body-shape and dentition of the wide-spread ...
Austin N. Fitzpatrick, Alice M. Clement, John A. Long   +2 more
doaj   +3 more sources

Endochondral bone in an Early Devonian ‘placoderm’ from Mongolia [PDF]

Nature Ecology & Evolution, 2020
Endochondral bone is the main internal skeletal tissue of nearly all osteichthyans—the group comprising more than 60,000 living species of bony fishes and tetrapods. Chondrichthyans (sharks and their kin) are the living sister group of osteichthyans and have cartilaginous endoskeletons, long considered the ancestral condition for all
Martin D. Brazeau, Sam Giles, Richard P. Dearden, Anna Jerve, Ya. Ariunchimeg, E. Zorig, Robert Sansom, Thomas Guillerme, Marco Castiello   +8 more
openaire   +9 more sources

Groenlandaspidid placoderm fishes from the Late Devonian of North America [PDF]

Records of the Australian Museum, 2003
Two new taxa of groenlandaspidid fish (Placodermi: Arthrodira) from non-marine deposits of the Catskill Formation (Upper Devonian) at Red Hill, Clinton County, Pennsylvania, USA, are the first to be described from North America outside of Greenland. Groenlandaspis pennsylvanica n.sp.
Daeschler, Edward B., Frumes, Anna C., Mullison, C. Frederick   +2 more
openaire   +2 more sources

Neurocranial anatomy of the petalichthyid placoderm <i>Shearsbyaspis oepiki</i> Young revealed by X-ray computed microtomography. [PDF]

Palaeontology, 2018
Stem‐group gnathostomes reveal the sequence of character acquisition in the origin of modern jawed vertebrates. The petalichthyids are placoderm‐grade stem‐group gnathostomes known from both isolated skeletal material and rarer articulated specimens of ...
Castiello M, Brazeau MD.
europepmc   +2 more sources