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2016 ; 3
(2
): 150635
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
The unexpected survival of an ancient lineage of anseriform birds into the
Neogene of Australia: the youngest record of Presbyornithidae
#MMPMID26998335
De Pietri VL
; Scofield RP
; Zelenkov N
; Boles WE
; Worthy TH
R Soc Open Sci
2016[Feb]; 3
(2
): 150635
PMID26998335
show ga
Presbyornithids were the dominant birds in Palaeogene lacustrine assemblages,
especially in the Northern Hemisphere, but are thought to have disappeared
worldwide by the mid-Eocene. Now classified within Anseriformes (screamers,
ducks, swans and geese), their relationships have long been obscured by their
strange wader-like skeletal morphology. Reassessment of the late Oligocene South
Australian material attributed to Wilaru tedfordi, long considered to be of a
stone-curlew (Burhinidae, Charadriiformes), reveals that this taxon represents
the first record of a presbyornithid in Australia. We also describe the larger
Wilaru prideauxi sp. nov. from the early Miocene of South Australia, showing that
presbyornithids survived in Australia at least until ca 22?Ma. Unlike on other
continents, where presbyornithids were replaced by aquatic crown-group anatids
(ducks, swans and geese), species of Wilaru lived alongside these waterfowl in
Australia. The morphology of the tarsometatarsus of these species indicates that,
contrary to other presbyornithids, they were predominantly terrestrial birds,
which probably contributed to their long-term survival in Australia. The
morphological similarity between species of Wilaru and the Eocene South American
presbyornithid Telmabates antiquus supports our hypothesis of a Gondwanan
radiation during the evolutionary history of the Presbyornithidae. Teviornis
gobiensis from the Late Cretaceous of Mongolia is here also reassessed and
confirmed as a presbyornithid. These findings underscore the temporal continuance
of Australia's vertebrates and provide a new context in which the phylogeny and
evolutionary history of presbyornithids can be examined.