A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna
Abstract The recovery of material of a small theropod from the Early Maastrichtian, Cape Lamb Member of the Snow Hill Island Formation is an unusual occurrence from primarily marine sediments. The pedal morphology of the specimen that includes a Metatarsal II with a lateral expansion caudal to Metat...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.546.3890 2023-05-15T13:42:36+02:00 A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna James E. Martin Marcelo Reguero The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.3890 http://pubs.usgs.gov/of/2007/1047/srp/srp083/of2007-1047srp083.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.3890 http://pubs.usgs.gov/of/2007/1047/srp/srp083/of2007-1047srp083.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.usgs.gov/of/2007/1047/srp/srp083/of2007-1047srp083.pdf text ftciteseerx 2016-01-08T11:18:26Z Abstract The recovery of material of a small theropod from the Early Maastrichtian, Cape Lamb Member of the Snow Hill Island Formation is an unusual occurrence from primarily marine sediments. The pedal morphology of the specimen that includes a Metatarsal II with a lateral expansion caudal to Metatarsal III, a third metatarsal that is proximally narrow and distally wide, a Metatarsal III with a distal end that is incipiently ginglymoidal and a second pedal digit with sickle-like ungual are all diagnostic of a theropod that belongs to the family of predatory dinosaurs, the Dromaeosauridae. Yet this Antarctic dromaeosaur retains plesiomorphic features in its ankle and foot morphology. As new dromaeosaur species are being recovered from the mid-Cretaceous of South America and the retention of primitive characters in the Antarctic dromaeosaur, a new biogeographic hypothesis on dromaeosaur distribution has been generated. Gondwanan dromaeosaurs are not North America immigrants into South America and Antarctica; rather they are the relicts of a cosmopolitan dromaeosaur distribution, which has been separated by the vicariant break up of Pangea and created an endemic clade of dromaeosaurs in Gondwana. Text Antarc* Antarctic Antarctica James Ross Island Ross Island Snow Hill Island Unknown Antarctic Cape Lamb ENVELOPE(-57.621,-57.621,-63.909,-63.909) Hill Island ENVELOPE(76.070,76.070,-69.395,-69.395) Ross Island Sickle ENVELOPE(-66.783,-66.783,-68.867,-68.867) Snow Hill ENVELOPE(-57.183,-57.183,-64.466,-64.466) Snow Hill Island ENVELOPE(-57.183,-57.183,-64.466,-64.466) The Antarctic |
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Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Abstract The recovery of material of a small theropod from the Early Maastrichtian, Cape Lamb Member of the Snow Hill Island Formation is an unusual occurrence from primarily marine sediments. The pedal morphology of the specimen that includes a Metatarsal II with a lateral expansion caudal to Metatarsal III, a third metatarsal that is proximally narrow and distally wide, a Metatarsal III with a distal end that is incipiently ginglymoidal and a second pedal digit with sickle-like ungual are all diagnostic of a theropod that belongs to the family of predatory dinosaurs, the Dromaeosauridae. Yet this Antarctic dromaeosaur retains plesiomorphic features in its ankle and foot morphology. As new dromaeosaur species are being recovered from the mid-Cretaceous of South America and the retention of primitive characters in the Antarctic dromaeosaur, a new biogeographic hypothesis on dromaeosaur distribution has been generated. Gondwanan dromaeosaurs are not North America immigrants into South America and Antarctica; rather they are the relicts of a cosmopolitan dromaeosaur distribution, which has been separated by the vicariant break up of Pangea and created an endemic clade of dromaeosaurs in Gondwana. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
James E. Martin Marcelo Reguero |
spellingShingle |
James E. Martin Marcelo Reguero A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna |
author_facet |
James E. Martin Marcelo Reguero |
author_sort |
James E. Martin |
title |
A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna |
title_short |
A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna |
title_full |
A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna |
title_fullStr |
A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna |
title_full_unstemmed |
A dromaeosaur from the Maastrichtian of James Ross Island and the Late Cretaceous Antarctic dinosaur fauna |
title_sort |
dromaeosaur from the maastrichtian of james ross island and the late cretaceous antarctic dinosaur fauna |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.3890 http://pubs.usgs.gov/of/2007/1047/srp/srp083/of2007-1047srp083.pdf |
long_lat |
ENVELOPE(-57.621,-57.621,-63.909,-63.909) ENVELOPE(76.070,76.070,-69.395,-69.395) ENVELOPE(-66.783,-66.783,-68.867,-68.867) ENVELOPE(-57.183,-57.183,-64.466,-64.466) ENVELOPE(-57.183,-57.183,-64.466,-64.466) |
geographic |
Antarctic Cape Lamb Hill Island Ross Island Sickle Snow Hill Snow Hill Island The Antarctic |
geographic_facet |
Antarctic Cape Lamb Hill Island Ross Island Sickle Snow Hill Snow Hill Island The Antarctic |
genre |
Antarc* Antarctic Antarctica James Ross Island Ross Island Snow Hill Island |
genre_facet |
Antarc* Antarctic Antarctica James Ross Island Ross Island Snow Hill Island |
op_source |
http://pubs.usgs.gov/of/2007/1047/srp/srp083/of2007-1047srp083.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.3890 http://pubs.usgs.gov/of/2007/1047/srp/srp083/of2007-1047srp083.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766169987668508672 |