New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999
The Flat Rocks locality in theWonthaggi Formation (Strzelecki Group) of the Gippsland Basin, southeastern Australia, hosts fossils of a late Barremian vertebrate fauna that inhabited the ancient rift between Australia and Antarctica. Known from its dentary, Qantassaurus intrepidusRich and Vickers-Ri...
Published in: | Journal of Paleontology |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
The Paleontological Society
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1017/jpa.2018.95 |
id |
ftbioone:10.1017/jpa.2018.95 |
---|---|
record_format |
openpolar |
spelling |
ftbioone:10.1017/jpa.2018.95 2024-06-02T07:57:29+00:00 New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 Matthew C. Herne Jay P. Nair Alistair R. Evans Alan M. Tait Matthew C. Herne Jay P. Nair Alistair R. Evans Alan M. Tait world 2019-04-26 text/HTML https://doi.org/10.1017/jpa.2018.95 en eng The Paleontological Society doi:10.1017/jpa.2018.95 All rights reserved. https://doi.org/10.1017/jpa.2018.95 Text 2019 ftbioone https://doi.org/10.1017/jpa.2018.95 2024-05-07T00:47:45Z The Flat Rocks locality in theWonthaggi Formation (Strzelecki Group) of the Gippsland Basin, southeastern Australia, hosts fossils of a late Barremian vertebrate fauna that inhabited the ancient rift between Australia and Antarctica. Known from its dentary, Qantassaurus intrepidusRich and Vickers-Rich, 1999 has been the only dinosaur named from this locality. However, the plethora of vertebrate fossils collected from Flat Rocks suggests that further dinosaurs await discovery. From this locality, we name a new small-bodied ornithopod, Galleonosaurus dorisae n. gen. n. sp. from craniodental remains. Five ornithopodan genera are now named from Victoria. Galleonosaurus dorisae n. gen. n. sp. is known from five maxillae, from which the first description of jaw growth in an Australian dinosaur is provided. The holotype of Galleonosaurus dorisae n. gen. n. sp. is the most complete dinosaur maxilla known from Victoria. Micro-CT imagery of the holotype reveals the complex internal anatomy of the neurovascular tract and antorbital fossa.We confirm that Q. intrepidus is uniquely characterized by a deep foreshortened dentary. Two dentaries originally referred to Q. intrepidus are reassigned to Q. ?intrepidus and a further maxilla is referred to cf. Atlascopcosaurus loadsiRich and Rich, 1989. A further ornithopod dentary morphotype is identified, more elongate than those of Q. intrepidus and Q. ?intrepidus and with three more tooth positions. This dentary might pertain to Galleonosaurus dorisae n. gen. n. sp. Phylogenetic analysis recovered Cretaceous Victorian and Argentinian nonstyracosternan ornithopods within the exclusively Gondwanan clade Elasmaria. However, the large-bodied taxon Muttaburrasaurus langdoniBartholomai and Molnar, 1981 is hypothesised as a basal iguanodontian with closer affinities to dryomorphans than to rhabdodontids. Text Antarc* Antarctic Antarctica BioOne Online Journals Antarctic Flat Rocks ENVELOPE(-55.715,-55.715,53.217,53.217) Molnar ENVELOPE(-66.982,-66.982,-66.177,-66.177) Journal of Paleontology 93 3 543 584 |
institution |
Open Polar |
collection |
BioOne Online Journals |
op_collection_id |
ftbioone |
language |
English |
description |
The Flat Rocks locality in theWonthaggi Formation (Strzelecki Group) of the Gippsland Basin, southeastern Australia, hosts fossils of a late Barremian vertebrate fauna that inhabited the ancient rift between Australia and Antarctica. Known from its dentary, Qantassaurus intrepidusRich and Vickers-Rich, 1999 has been the only dinosaur named from this locality. However, the plethora of vertebrate fossils collected from Flat Rocks suggests that further dinosaurs await discovery. From this locality, we name a new small-bodied ornithopod, Galleonosaurus dorisae n. gen. n. sp. from craniodental remains. Five ornithopodan genera are now named from Victoria. Galleonosaurus dorisae n. gen. n. sp. is known from five maxillae, from which the first description of jaw growth in an Australian dinosaur is provided. The holotype of Galleonosaurus dorisae n. gen. n. sp. is the most complete dinosaur maxilla known from Victoria. Micro-CT imagery of the holotype reveals the complex internal anatomy of the neurovascular tract and antorbital fossa.We confirm that Q. intrepidus is uniquely characterized by a deep foreshortened dentary. Two dentaries originally referred to Q. intrepidus are reassigned to Q. ?intrepidus and a further maxilla is referred to cf. Atlascopcosaurus loadsiRich and Rich, 1989. A further ornithopod dentary morphotype is identified, more elongate than those of Q. intrepidus and Q. ?intrepidus and with three more tooth positions. This dentary might pertain to Galleonosaurus dorisae n. gen. n. sp. Phylogenetic analysis recovered Cretaceous Victorian and Argentinian nonstyracosternan ornithopods within the exclusively Gondwanan clade Elasmaria. However, the large-bodied taxon Muttaburrasaurus langdoniBartholomai and Molnar, 1981 is hypothesised as a basal iguanodontian with closer affinities to dryomorphans than to rhabdodontids. |
author2 |
Matthew C. Herne Jay P. Nair Alistair R. Evans Alan M. Tait |
format |
Text |
author |
Matthew C. Herne Jay P. Nair Alistair R. Evans Alan M. Tait |
spellingShingle |
Matthew C. Herne Jay P. Nair Alistair R. Evans Alan M. Tait New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 |
author_facet |
Matthew C. Herne Jay P. Nair Alistair R. Evans Alan M. Tait |
author_sort |
Matthew C. Herne |
title |
New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 |
title_short |
New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 |
title_full |
New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 |
title_fullStr |
New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 |
title_full_unstemmed |
New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 |
title_sort |
new small-bodied ornithopods (dinosauria, neornithischia) from the early cretaceous wonthaggi formation (strzelecki group) of the australian-antarctic rift system, with revision of qantassaurus intrepidus rich and vickers-rich, 1999 |
publisher |
The Paleontological Society |
publishDate |
2019 |
url |
https://doi.org/10.1017/jpa.2018.95 |
op_coverage |
world |
long_lat |
ENVELOPE(-55.715,-55.715,53.217,53.217) ENVELOPE(-66.982,-66.982,-66.177,-66.177) |
geographic |
Antarctic Flat Rocks Molnar |
geographic_facet |
Antarctic Flat Rocks Molnar |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
https://doi.org/10.1017/jpa.2018.95 |
op_relation |
doi:10.1017/jpa.2018.95 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1017/jpa.2018.95 |
container_title |
Journal of Paleontology |
container_volume |
93 |
container_issue |
3 |
container_start_page |
543 |
op_container_end_page |
584 |
_version_ |
1800740641558233088 |