[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Aquilops, new ceratopsian from Lower Cretaceous of Montana, oldest in North America
New Palaeocast podcast interview with Andy Farke about Aquilops.
On Wed, Dec 10, 2014 at 11:35 AM, Ben Creisler <firstname.lastname@example.org> wrote:
> And about the artistic reconstruction:
> On Wed, Dec 10, 2014 at 11:26 AM, Ben Creisler <email@example.com> wrote:
>> Ben Creisler
>> New in PLoS ONE:
>> Andrew A. Farke, W. Desmond Maxwell, Richard L. Cifelli & Mathew J.
>> Wedel (2014)
>> A Ceratopsian Dinosaur from the Lower Cretaceous of Western North
>> America, and the Biogeography of Neoceratopsia.
>> PLoS ONE 9(12): e112055.
>> The fossil record for neoceratopsian (horned) dinosaurs in the Lower
>> Cretaceous of North America primarily comprises isolated teeth and
>> postcrania of limited taxonomic resolution, hampering previous efforts
>> to reconstruct the early evolution of this group in North America. An
>> associated cranium and lower jaw from the Cloverly Formation
>> (?middle–late Albian, between 104 and 109 million years old) of
>> southern Montana is designated as the holotype for Aquilops americanus
>> gen. et sp. nov. Aquilops americanus is distinguished by several
>> autapomorphies, including a strongly hooked rostral bone with a
>> midline boss and an elongate and sharply pointed antorbital fossa. The
>> skull in the only known specimen is comparatively small, measuring 84
>> mm between the tips of the rostral and jugal. The taxon is interpreted
>> as a basal neoceratopsian closely related to Early Cretaceous Asian
>> taxa, such as Liaoceratops and Auroraceratops. Biogeographically, A.
>> americanus probably originated via a dispersal from Asia into North
>> America; the exact route of this dispersal is ambiguous, although a
>> Beringian rather than European route seems more likely in light of the
>> absence of ceratopsians in the Early Cretaceous of Europe. Other
>> amniote clades show similar biogeographic patterns, supporting an
>> intercontinental migratory event between Asia and North America during
>> the late Early Cretaceous. The temporal and geographic distribution of
>> Upper Cretaceous neoceratopsians (leptoceratopsids and ceratopsoids)
>> suggests at least intermittent connections between North America and
>> Asia through the early Late Cretaceous, likely followed by an interval
>> of isolation and finally reconnection during the latest Cretaceous.
>> News and blogs: