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Temporal range: Early Paleocene to Present, 61–0 Ma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Monotremata
Suborder: Platypoda
Family: Ornithorhynchidae
Gray, 1825


The Ornithorhynchidae are one of the two extant families in the order Monotremata, and contains the platypus and its extinct relatives. The other family is the Tachyglossidae, or echidnas. Within Ornithorhynchidae are two genera, Obdurodon and Ornithorhynchus:

Another two genera, Steropodon and Teinolophos, were originally thought to belong to Ornithorhynchidae. However, they were both placed into a new family, Steropodontidae.[1] This decision was made based on differences in the dentary recovered from the Griman Creek Formation, Lightning Ridge, New South Wales, Australia. This dentary is the holotype for the Steropodon genus, and thus the lack of information is what led to the original misclassification.

The extinct Ornithorhynchus maximus was once included in Ornithorhynchus, but has now been determined to be from the echidna family as Zaglossus robustus.[2]


  1. ^ Flannery, Timothy F.; Archer, Michael; Rich, Thomas H.; Jones, Robert (5 October 1995). "A new family of monotremes from the Creataceous of Australia". Nature 377: 418–420. doi:10.1038/377418a0. 
  2. ^ Musser, A. M. (2003). "Review of the monotreme fossil record and comparison of palaeontological and molecular data". Comparative Biochemistry and Physiology A 136 (4): 927–42. doi:10.1016/s1095-6433(03)00275-7. PMID 14667856. 

Media related to Ornithorhynchidae at Wikimedia Commons