Regarding the nomenclature, please, see the suppl. info (Appendix_I) of our paper. It includes comments on (and modifications to) some phylogenetic definitions:Âhttps://www.tandfonline.com/doi/suppl/10.1080/14772019.2017.1371258?scroll=top
Best wishes,
Daniel
st, 5. pro 2018 7:54 odesÃlatel Tim Williams <tijawi@gmail.com> napsal:
It's great to see new Australian dinosaurs coming to light (there are more on the way). According to the phylogeny in this study (Fig. 9), Ornithopoda has lost a lot of 'traditional' members (including almost all the taxa that used to be called 'hypsilophodontids'), as also found by other recent studies (e.g., Madzia et al., 2017). Oddly, under some definitions (e.g. Boyd, 2015), both Clypeodonta and Iguanodontia would be more inclusive than Ornithopoda! One alternative is to redefine Ornithopoda so it can include marginocephalians; that way, _Hypsilophodon_ and parksosaurids would return to Ornithopoda rather than just being neornithischians. However, my preference would be to abolish Ornithopoda (and Euornithopoda) altogether.
Bell &c also find no evidence of a uniquely Australian clade of ornithopods. For example, _Leaellynasaura_ is called a basal neornithischian, whereas many of the other small-bodied ornithischians appear to be true ornithopods. Note that Herne et al. (2016) previously argued that _Leaellynasaura_ should be limited to the holotype partial skull fragment (NMV P185991) and any future discoveries that have characters which match this holotype; so referred _Leaellynasaura_ material should be excluded, including the skull roof (P185991) and various postcranial remains (P185992/P185993, P186047, etc) that can't currently be demonstrated to belong to _Leaellynasaura_. (Bell &c also mention a maxilla NMV P229196 as "_Leaellynasaura_ sp.", but this is destined not to remain in this genus.) _Leaellynasaura_ remains a highly contentious taxon.On Wed, Dec 5, 2018 at 3:29 AM Ben Creisler <bcreisler@gmail.com> wrote:Ben CreislerA new paper in open access:Weewarrasaurus pobeni gen. et sp. nov.Phil R. Bell, Matthew C. Herne, Tom Brougham & Elizabeth T. Smith (2018)Ornithopod diversity in the Griman Creek Formation (Cenomanian), New South Wales, Australia.ÂPeerJ 6:e6008Free pdf:ÂDuring the Early Cretaceous, dinosaur communities of the Australian-Antarctic rift system (Eumeralla and Wonthaggi formations) cropping out in Victoria were apparently dominated by a diverse small-bodied 'basal ornithopod' fauna. Further north, in Queensland (Winton and Mackunda formations), poorly-represented small-bodied ornithopods coexisted with large-bodied iguanodontians. Our understanding of the ornithopod diversity from the region between the Australian-Antarctic rift and Queensland, represented by Lightning Ridge in central-northern New South Wales (Griman Creek Formation), has been superficial. Here, we re-investigate the ornithopod diversity at Lightning Ridge based on new craniodental remains. Our findings indicate a diverse ornithopod fauna consisting of two-to-three small-bodied non-iguanodontian ornithopods (including Weewarrasaurus pobeni gen. et sp. nov.), at least one indeterminate iguanodontian, and a possible ankylopollexian. These results support those of previous studies that favour a general abundance of small-bodied basal ornithopods in Early to mid-Cretaceous high-latitude localities of southeastern Australia. Although these localities are not necessarily time-equivalent, increasing evidence indicates that Lightning Ridge formed a 'meeting point' between the basal ornithopod-dominated localities in Victoria and the sauropod-iguanodontian faunas in Queensland to the north.News: