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Pengana Temporal range:
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Accipitriformes
Family:	Accipitridae
Genus:	†Pengana
Species:	†P. robertbolesi
Binomial name
†Pengana robertbolesi Boles, 1993

History and naming

In 1993, ornithologist Walter E. Boles described material belonging to an accipitrid that was collected from the late Oligocene (to early Miocene) aged Sticky Beak Site in the Riversleigh World Heritage Area, Queensland, Australia. This material was referred to a new genus and species, Pengana roberbolesi. The holotype, and only known specimen, (QMF16865) is a distal portion of the left tibiotarsus that is housed at the Queensland Museum.

The genus name is derived from a First Nation Australian word (no language was specified) for ‘hawk’, while the species name is in honour of the author's late father, Richard Boles.

Description

Pengana is said to have been twice the size of the harrier and crnae hawks, and larger than any living Australian acciptirid, with the exception of wedge tailed eagle and white breasted sea eagle.

The tibiotarsus has a distal width of 16.4 mm, with an external condyle depth of 13.i mm and an internal condyle depth of 13.2 mm. It has an overall flat and rectangular appearance. It differs from most acciptirids by having a combination of a horizontal supratendinal bridge, mediolaterally (middle and sides) flattened distal condyles, parallel sides to distal end of shaft, and anterioposteriorly compressed shaft. Is similar to Geranospiza and Polyboroides but differs by its greater size, proportional width of supratendinal canal, orientation of supratendinal canal, more medially placed distal opening to the supratendinal canal, and proportionally wider anterior intercondylar fossa.