The most primitive osteichthyan braincase?

Article Abstract:

It is possible that AMF101607, an actinopterygian-like osteichthyan braincase from the Early Devonian Taemas Limestone at Wee Jasper, New South Wales, Australia, branches from the tree between placoderms and chondrichthyans. It is suggested that AMF101607 is not just a primitive actinopterygian, but a stem-group osteichthyan. If this is the case, then it shows primitive cranial conditions for the lineage ancestral to ray-finned fish and for the lineage leading to lobe-finned fishes and humans. The characteristic osteichthyan pattern of paired frontals and parietal flanked by a series of temporal bones can be clearly seen.

Research, Osteichthyes

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A possible late cambrian vertebrate from Australia

Article Abstract:

Fossil skeletons found in western Queensland exhibit some vertebrate characters and suggests alternative model for early vertebrate dermal armour. It has a three-layered structure which lack dentine tissue and the tubercles are formed from elevations of the superficial enamel-like layer. It supports the macromeric condition of the early vertebrate exoskeleton. Its sheet like phosphatic skeleton lacking odontode contradicts the odontode model. The combination of pore-canal system and enamel like hard cover show that it evolved earlier than the bone and dentine formation.

Observations, Natural history, Paleontology, Cambrian period, Vertebrates, Fossil, Fossil vertebrates

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An exceptional Devonian fish from Australia sheds light on tetrapod origins

Article Abstract:

The observations from the most complete, acid-prepared Devonian tetrapodomorph fish from Australia, Gogonasus, are presented. The new phylogenetic analysis has placed Gogonasus crownward of Eusthenopteron as the sister taxon to the Elpistostegalia, where the basic tetrapod limb skeleton and middle ear architecture can be traced further back within the tetrapodomorph radiation.

Australia, Discovery and exploration, Cladistic analysis, Chemical properties, Fishes, Fossil, Fossil fishes

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