Fossilized ontogenies: The contribution of placoderm ontogeny to our understanding of the evolution of early gnathostomes
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Placoderms, representing phylogenetically more inclusive jawed vertebrates and successive sister taxa to crown-group gnathostomes, are critical to our understanding of character evolution within the crown-group (chondrichthyans + osteichthyans), including developmental characters. Early ontogenetic stages of placoderms are generally poorly known, although some exceptional faunas preserve both embryonic (e.g. from the Gogo Formation, Western Australia) and post-embryonic individuals (the Miguasha Formation, Canada; Lode Formation, Latvia; Merriganowry Formation, Gogo Formation, Australia). Information provided by these ontogenies is relevant to questions of placoderm taxonomy and phylogeny, but also to broader questions pertinent to vertebrate evolution as a whole, for example, evolution of bone development, evolution of the axial skeleton and evolution of reproduction.
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Johanson, Z.; Trinajstic, Kate; Carr, R.; Ritchie, A. (2012)The synarcual is a structure incorporating the anterior vertebrae of the axial skeleton and occurs in vertebrate taxa such as the fossil group Placodermi and the Chondrichthyes (Holocephali, Batoidea). Although the synarcual ...
3D microstructural architecture of muscle attachments in extant and fossil vertebrates revealed by synchrotron microtomographySanchez, S.; Dupret, V.; Tafforeau, P.; Trinajstic, Kate; Ryll, B.; Gouttenoire, P.; Wretman, L.; Zylberberg, L.; Peyrin, F.; Ahlberg, P. (2013)Background: Firm attachments binding muscles to skeleton are crucial mechanical components of the vertebrate body. These attachments (entheses) are complex three-dimensional structures, containing distinctive arrangements ...
New morphological information on the ptyctodontid fishes (Placodermi, Ptyctodontida) from Western AustraliaTrinajstic, Kate; Long, J.; Johanson, Z.; Young, G.; Senden, T. (2012)A full description of a complete and articulated, three-dimensionally preserved, placoderm fish, Materpiscis attenboroughi (Ptyctodontida), from the Late Devonian Gogo Formation is presented. The jaw articulation is unique ...