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A Silurian placoderm with osteichthyan-like marginal jaw bones
A three-dimensionally preserved 419-million-year-old placoderm fish from the Silurian of China is described that represents the first stem gnathostome with dermal marginal jaw bones (premaxilla, maxilla and dentary), features previously restricted to Osteichthyes. Expand
A new genus and species of basal actinopterygian fish from the Upper Devonian Gogo Formation of Western Australia
A new basal actinopterygian fish, Gogosardina coatesi gen. nov, is described from the Upper Devonian Gogo Formation of the Canning Basin, Western Australia and possesses a series of four small postrostrals, no surangular and a highly gracile body covered with over 140 vertical rows of very small scales. Expand
Revision of the actinopterygian genus Mimipiscis (=Mimia) from the Upper Devonian Gogo Formation of Western Australia and the interrelationships of the early Actinopterygii
  • Brian Choo
  • Biology
  • Earth and Environmental Science Transactions of…
  • 1 June 2011
Phylogenetic analyses recover Mimipiscis and Gogosardina as sister genera within a monophyletic Mimiidae, a clade restricted to the Late Devonian of Western Australia. Expand
Devonian macrovertebrate assemblages and biogeography of East Gondwana (Australasia, Antarctica)
Abstract The biogeographic significance of Devonian macrovertebrate assemblages from East Gondwana is reviewed, with updates incorporating recent discoveries including new placoderms (antiarchs,Expand
Copulation in antiarch placoderms and the origin of gnathostome internal fertilization
It is shown that certain antiarchs possessed dermal claspers in the males, while females bore paired dermal plates inferred to have facilitated copulation, suggesting that external fertilization and spawning, which characterize most extant aquatic gnathostomes, must be derived from internal fertilization, even though this transformation has been thought implausible. Expand
Nothosaur foraging tracks from the Middle Triassic of southwestern China.
The seas of the Mesozoic (266-66 Myr ago) were remarkable for predatory marine reptiles, but their modes of locomotion have been debated. One problem has been the absence of tracks, although there isExpand
Cretaceous ichthyosaurs from Western Australia
Outcrops of probable Birdrong Sandstone (late Hauterivian-mid Barremian) at Cardabia Station, Giralia Anticline, Carnarvon Basin, Western Australia, have yielded numerous ichthyosaurian remains inExpand
An antiarch placoderm shows that pelvic girdles arose at the root of jawed vertebrates
The finding shows that all jawed vertebrates (including antiarch placoderms) primitively possess both pectoral and pelvic fins and that the pelvic fins did not arise within gnathostomes at a point subsequent to the origin of jaws. Expand
Exceptional vertebrate biotas from the Triassic of China, and the expansion of marine ecosystems after the Permo-Triassic mass extinction
Abstract The Triassic was a time of turmoil, as life recovered from the most devastating of all mass extinctions, the Permo-Triassic event 252 million years ago. The Triassic marine rock successionExpand
A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica
Abstract A new basal actinopterygian fish, Donnrosenia schaefferi gen. et sp. nov., is described from the Middle Devonian (Givetian) Aztec Siltstone of southern Victoria Land, Antarctica. DonnroseniaExpand