The First Hatchling Dinosaur Reported from the Eastern United States: Propanoplosaurus marylandicus (Dinosauria: Ankylosauria) from the Early Cretaceous of Maryland, U.S.A.

Stanford, Ray; Weishampel, David B.; DeLeon, Valerie B.

doi:10.1666/10-113.1

Cited by 16 publications

(14 citation statements)

References 18 publications

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“…All previous workers have considered Priconodon to represent a nodosaurid ankylosaur. More recently, an impression of a small ankylosaur from the early Aptian Patuxent Formation of Maryland was named Propanoplosaurus marylandicus Standford, Weishampel & Deleon, 2011, and was considered a nodosaurid ankylosaur. Several ankylosaurs have been recovered from the Paw Paw Formation of Tarrant County, Texas, including Pawpawsaurus, Texasetes and a juvenile 'scuteling' (Jacobs et al 1994;Coombs 1995;Lee 1996).…”

Section: The Mid Cretaceous North American 'Ankylosaurid Gap' and Latmentioning

confidence: 99%

Systematics, phylogeny and palaeobiogeography of the ankylosaurid dinosaurs

Arbour

Currie

2015

Journal of Systematic Palaeontology

135

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Section: The Mid Cretaceous North American 'Ankylosaurid Gap' and Latmentioning

confidence: 99%

Systematics, phylogeny and palaeobiogeography of the ankylosaurid dinosaurs

Arbour

Currie

2015

Journal of Systematic Palaeontology

135

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“…Collectively, however, the scattered discoveries across the Gulf and Atlantic Coastal Plain reveal an eastern North American Cretaceous dinosaur bestiary that included six major dinosaur clades. To date, these include hadrosauroids (e.g., Langston, Jr., 1960;Prieto-Márquez, Weishampel & Horner, 2006;Prieto-Márquez, Erickson & Ebersole, 2016a), ankylosaurians (Langston, Jr., 1960;Weishampel & Young, 1996;Stanford, Weishampel & Deleon, 2011), tyrannosauroids (Baird & Horner, 1979;Schwimmer et al, 1993;Carpenter et al, 1997;Carr, Williamson & Schwimmer, 2005), dromaeosaurids (Kiernan & Schwimmer, 2004), ornithomimids (Baird & Horner, 1979;Carpenter, 1982;Schwimmer et al, 1993), and ceratopsians (Chinnery et al, 1998;Longrich, 2016; this paper).…”

Section: Methodsmentioning

confidence: 99%

Peer Review #1 of "The first reported ceratopsid dinosaur from eastern North America (Owl Creek Formation, Upper Cretaceous, Mississippi, USA) (v0.1)"

Averianov¹

2017

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Ceratopsids ("horned dinosaurs") are known from western North America and Asia, a distribution reflecting an inferred subaerial link between the two landmasses during the Late Cretaceous. However, this clade was previously unknown from eastern North America, presumably due to limited outcrop of the appropriate age and depositional environment as well as the separation of eastern and western North America by the Western Interior Seaway during much of the Late Cretaceous. A dentary tooth from the Owl Creek Formation (late Maastrichtian) of Union County, Mississippi, represents the first reported occurrence of Ceratopsidae from eastern North America. This tooth shows a combination of features typical of Ceratopsidae, including a double root and a prominent, blade-like carina. Based on the age of the fossil, we hypothesize that it is consistent with a dispersal of ceratopsids into eastern North America during the very latest Cretaceous, presumably after the two halves of North America were reunited following the retreat of the Western Interior Seaway.

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“…The nodosaur genus Propanoplosaurus marylandicus ( Figure 5.8) is known from a specimen constituting of both molds and casts of the skeleton of a neonate individual which was recovered alongside the ichnofossils of dinosaurs (Stanford et al, 2011). The specimen included the posterior cranium, the ribcage vertebrae, the right femur and portions of the pes, and the partial right forelimb.…”

Section: Aptianmentioning

confidence: 99%

“…The specimen included the posterior cranium, the ribcage vertebrae, the right femur and portions of the pes, and the partial right forelimb. The holotype of Propanoplosaurus is important for being the first nodosaur skeleton from the eastern seaboard (Stanford et al, 2011) and along with Priconodon is the only valid nodosaur taxon named from the Aptian of the east coast of North America. Arkansas Trinity Group.…”

Section: Aptianmentioning

confidence: 99%

The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia

Brownstein¹

2018

Palaeontol Electron

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The Cenomanian to Maastrichtian of the Late Cretaceous saw the flooding of the interior of North America by the Western Interior Seaway, which created the eastern landmass of Appalachia and the western landmass of Laramidia. Though Appalachian dinosaur faunas are poorly known, they are nevertheless important for understanding Cretaceous dinosaur paleobiogeography and ecology. In order to better track the vicariance of eastern and western North American dinosaur faunas over the duration of the Cretaceous, the former were compared with the latter from the Aptian to Maastrichtian Stages of the Late Cretaceous using several similarity indices. The data gathered from biogeographic similarity indices suggest that an almost completely homogenous North American dinosaur fauna found in the Early Cretaceous experienced significant vicariance, splitting into a Laramidian fauna differentiated by the presence of ceratopsids, pachycephalosaurids, saurolophids, lambeosaurines, ankylosaurids, therizinosaurids, and troodontids and an Appalachian fauna characterized by the lack of the aforementioned groups and the presence of non-hadrosaurid hadrosauroids, massive hadrosauroids, basal hadrosaurids, leptoceratopsians, "intermediate"-grade tyrannosauroids, and nodosaurids between the Cenomanian and Campanian, with these two faunas later experiencing limited dispersal after the disappearance of the Western Interior Seaway from the American Interior during the Maastrichtian. Dinosaur provincialism and ecology on Appalachia are also investigated and discussed.

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The First Hatchling Dinosaur Reported from the Eastern United States: Propanoplosaurus marylandicus (Dinosauria: Ankylosauria) from the Early Cretaceous of Maryland, U.S.A.

Cited by 16 publications

References 18 publications

Systematics, phylogeny and palaeobiogeography of the ankylosaurid dinosaurs

Systematics, phylogeny and palaeobiogeography of the ankylosaurid dinosaurs

Peer Review #1 of "The first reported ceratopsid dinosaur from eastern North America (Owl Creek Formation, Upper Cretaceous, Mississippi, USA) (v0.1)"

The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia

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