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A morphogenetic approach to the origin and basic organization of the tetrapod limb
Two complementary approaches underlie the study of evolutionary morphology—one a direct result of the Darwinian revolution, the other with roots that can be traced back to pre-Darwinian times. The…
A Devonian tetrapod-like fish and the evolution of the tetrapod body plan
The discovery of a well-preserved species of fossil sarcopterygian fish from the Late Devonian of Arctic Canada that represents an intermediate between fish with fins and tetrapods with limbs, and provides unique insights into how and in what order important tetrapod characters arose is reported.
Fossils, genes and the evolution of animal limbs
The origin and diversification of fins, wings and other structures, long a focus of palaeontology, can now be approached through developmental genetics.
The pectoral fin of Tiktaalik roseae and the origin of the tetrapod limb
The pectoral appendage of a member of the sister group of tetrapods, Tiktaalik roseae, is described, which is morphologically and functionally transitional between a fin and a limb.
The African coelacanth genome provides insights into tetrapod evolution.
Through a phylogenomic analysis, it is concluded that the lungfish, and not the coelacanth, is the closest living relative of tetrapods.
Deep homology and the origins of evolutionary novelty
Advances in developmental genetics, palaeontology and evolutionary developmental biology have recently shed light on the origins of some of the structures that most intrigued Charles Darwin, including animal eyes, tetrapod limbs and giant beetle horns.
The spotted gar genome illuminates vertebrate evolution and facilitates human-to-teleost comparisons
To connect human biology to fish biomedical models, we sequenced the genome of spotted gar (Lepisosteus oculatus), whose lineage diverged from teleosts before teleost genome duplication (TGD). The…
Three-dimensional preservation of foot movements in Triassic theropod dinosaurs
Dinosaur footprints have been used extensively as biostratigraphic markers, environmental indicators, measures of faunal diversity and evidence of group behaviour,. Trackways have also been used to…
Earliest known crown-group salamanders
The discovery of well-preserved Middle Jurassic salamander from China constitutes the earliest known record of crown-group urodeles (living salamanders and their closest relatives) and provides evidence to support the hypothesis that the divergence of the Cryptobranchidae from the Hynobiidae had taken place in Asia before the Middle Jurassic period.
An autopodial-like pattern of Hox expression in the fins of a basal actinopterygian fish
Comparative analyses of Hox gene expression and regulation in teleost fish and tetrapods support the long-entrenched notion that the distal region of tetrapod limbs, containing the wrist, ankle and digits, is an evolutionary novelty and show that aspects of the development of the autopod are primitive to tetrapoids.