ammonites
Obdurodon Woodburne and Tedford 1975 (platypus)

Mammalia - Monotremata - Ornithorhynchidae

Full reference: M. O. Woodburne and R. H. Tedford. 1975. The first Tertiary monotreme from Australia. American Museum of Novitates 2588:1-11

Parent taxon: Ornithorhynchidae according to T. Rowe et al. 2008

Sister taxa: Monotrematum, Ornithorhynchus, Steropodon, Teinolophos

Subtaxa: Obdurodon dicksoni, Obdurodon insignis

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Ecology: scansorial insectivore-herbivore