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Devonian rhizodontids and tristichopterids (Sarcopterygii; Tetrapodomorpha) from East Gondwana
- Z. Johanson, P. Ahlberg
- Biology, Environmental ScienceTransactions of the Royal Society of Edinburgh…
- 1 March 2001
It is argued that the Rhizodontida evolved on the Gondwanan landmass, and notorhizodon occupies a relatively derived position within the Tristichopteridae, but is contemporary with the earliest and phylogenetically most basal Laurussian members of the group.
A new tristichopterid (Osteolepiformes: Sarcopterygii) from the Mandagery Sandstone (Late Devonian, Famennian) near Canowindra, NSW, Australia
Abstract A new member of the Tristichopteridae (=Eusthenopteridae), Mandageria fairfaxi gen. et sp. nov., is described from the Late Devonian (Famennian) Mandagery Sandstone outcropping near…
Second tristichopterid (Sarcopterygii, Osteolepiformes) from the Upper Devonian of Canowindra, New South Wales, Australia, and phylogeny of the Tristichopteridae
ABSTRACT A new tristichopterid, Cabonnichthys burnsi gen. et sp. nov. from the Upper Devonian Mandagery Sandstone near Canowindra, New South Wales, Australia, is the second tristichopterid to be…
Osteolepiforms and the ancestry of tetrapods
The supposedly discredited idea of osteolepiforms as tetrapod ancestors is supported by the first detailed analysis of the lower part of the Tetrapodomorpha, based on 99 characters scored for 29 taxa.
Fish fingers: digit homologues in sarcopterygian fish fins.
- Z. Johanson, J. Joss, Catherine A. Boisvert, Rolf Ericsson, M. Sutija, P. Ahlberg
- BiologyJournal of Experimental Zoology Part B: Molecular…
- 15 December 2007
Evidence suggests that Neoceratodus fin radials and tetrapod digits may be patterned by shared mechanisms distinct from those patterning the proximal fin/limb elements, and in that sense are homologous.
Revision of the Late Cretaceous North American marsupial genus Alphadon
- Z. Johanson
- GeologyPalaeontographica Abteilung A
- 19 December 1996
Evolution and development of the vertebrate neck
If the cucullaris is a definitive lateral plate‐derived structure it may have evolved in conjunction with the shoulder/limb skeleton in vertebrates and thereby provided a greater degree of flexibility to the heads of predatory vertebrates.
Separate Evolutionary Origins of Teeth from Evidence in Fossil Jawed Vertebrates
It appears that these placoderm teeth develop and are regulated as in other jawed vertebrates, and it is suggested that teeth evolved at least twice, through a mechanism of convergent evolution.
Developmental plasticity and disparity in early dipnoan (lungfish) dentitions
A phylogenetic analysis of early lungfishes incorporating a novel approach to coding these process characters in preference to the resultant adult dental morphology shows that the widely discussed hypothesis of separate tooth‐plated, dentine‐ Plated, and denticulated lineages is unlikely to be true.
A complete primitive rhizodont from Australia
The new evidence shows that rhizodonts are more remote from tetrapods than are osteolepiform and elpistostegid lobe-fin fishes and the pectoral fin of Sauripteris should not be used as a model limb precursor.