Skeletal Morphology of Palaeocastor peninsulatus (Rodentia, Castoridae) from the Fort Logan Formation of Montana (early Arikareean): Ontogenetic and Paleoecological Interpretations

Calede, Jonathan J.

doi:10.1007/s10914-013-9231-8

Cited by 10 publications

(18 citation statements)

References 28 publications

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“…The robust cranium and broad, flat incisors of the John Day specimens are consistent with specialization for chisel-tooth digging behavior (Samuels and Van Valkenburgh 2009), which is supported for P. fossor by artifactual evidence within burrows (Martin and Bennett 1977). Palaeocastor peninsulatus has been inferred to be a primarily scratch digging species (Samuels and Van Valkenburgh 2009;Calede 2014). Flynn and Jacobs (2008) indicated the occurrence of P. fossor from the lower Turtle Cove Member of the John Day Formation, but from an uncertain locality.…”

Section: Methodsmentioning

confidence: 63%

“…The skull and cheek-tooth row lengths of the P. fossor specimens described here overlap with those of P. peninsulatus specimens known from John Day (Tables 3-4). It is important to note that recent work by Stefen (2010) and Calede (2014) found neither skull size nor dental morphology may be useful in differentiating palaeocastorine beavers. Both size and crown morphology change dramatically as the teeth wear (Stefen 2010;Calede 2014), meaning the identification of fossil beavers by dental material alone is difficult.…”

Section: Methodsmentioning

confidence: 95%

“…It is important to note that recent work by Stefen (2010) and Calede (2014) found neither skull size nor dental morphology may be useful in differentiating palaeocastorine beavers. Both size and crown morphology change dramatically as the teeth wear (Stefen 2010;Calede 2014), meaning the identification of fossil beavers by dental material alone is difficult. Similarly, the cranial morphology and overall dimensions of Palaeocastor change substantially through ontogeny (Calede 2014).…”

Section: Methodsmentioning

confidence: 95%

“…In the cladistic analyses of Rybczynski (2007) and Calede (2014), P. peninsulatus was found to be the sister group to the highly fossorial clade of palaeocastorines that includes P. fossor and the likely subterranean Euhapsis Martin, 1987, and Fossorcastor. While P. peninsulatus is known and relatively abundant in the lower and upper Turtle Cove Member strata (Ar1 -Ar2), all of the P. fossor specimens described here come from above the Tin Roof Tuff, higher in the John Day Formation section (Ar3).…”

Section: Methodsmentioning

confidence: 98%

“…Both size and crown morphology change dramatically as the teeth wear (Stefen 2010;Calede 2014), meaning the identification of fossil beavers by dental material alone is difficult. Similarly, the cranial morphology and overall dimensions of Palaeocastor change substantially through ontogeny (Calede 2014).…”

Section: Methodsmentioning

confidence: 99%

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New Rodent Material from the John Day Formation (Arikareean, Middle Oligocene to Early Miocene) of Oregon

Korth¹,

Samuels²

2015

Annals of Carnegie Museum

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The John Day Formation of Oregon is one of the richest and best studied assemblages in North America. Including seven members and spanning about 20 million years, there are over 150 vertebrate species known from the John Day Formation. The rodent faunas of John Day have not been as well studied as larger mammals, with many families having received little attention in the last hundred years. Here, twenty one species of rodents are described, based on new discoveries and previously unpublished specimens from the John Day Formation. The new material includes four new genera and species; the eutypomyid Allotypomys pictus, the anchitheriomyine castorid Microtheriomys brevirhinus, the eomyid Proapeomys condoni, the heteromyid Bursagnathus aterosseus; and six new species: the sciurine sciurid Miosciurus covensis, the eomyids Apeomys whistleri and Neoadjidaumo arctozophus, the heteromyids Proheteromys latidens and Trogomys oregonensis, and the sicistine dipodid Plesiosminthus fremdi. The problematical eomyid species, "Florentiamys" lulli Wood, 1936a, is referred questionably as a new combination, ?Proapeomys lulli (Wood, 1936a). Emended diagnoses of Miosciurus ballovianus (Cope, 1881) and Proheteromys thorpei Wood, 1935b, are offered based upon substantially more complete material than was previously known for either. Biostratigraphic ranges of the newly described rodents allow more direct comparison with other contemporaneous faunas from North America. These new rodents also allow better reconstruction of past ecosystems and are vital for understanding how faunas have changed through time in the region.

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Section: Methodsmentioning

confidence: 63%

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

New Rodent Material from the John Day Formation (Arikareean, Middle Oligocene to Early Miocene) of Oregon

Korth¹,

Samuels²

2015

Annals of Carnegie Museum

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Locomotory adaptations in entoptychine gophers (Rodentia: Geomyidae) and the mosaic evolution of fossoriality

Calede

Samuels

Chen

2019

Journal of Morphology

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Pocket gophers (family Geomyidae) are the dominant burrowing rodents in North America today. Their fossil record is also incredibly rich; in particular, entoptychine gophers, a diverse extinct subfamily of the Geomyidae, are known from countless teeth and jaws from Oligocene and Miocene-aged deposits of the western United States and Mexico. Their postcranial remains, however, are much rarer and little studied. Yet, they offer the opportunity to investigate the locomotion of fossil gophers, shed light on the evolution of fossoriality, and enable ecomorphological comparisons with contemporaneous rodents. We present herein a quantitative study of the cranial and postcranial remains of eight different species of entoptychine gophers as well as many contemporary rodent species. We find a range of burrowing capabilities within Entoptychinae, including semifossorial scratch-digging animals and fossorial taxa with cranial adaptations to burrowing. Our results suggest the repeated evolution of chisel-tooth digging across genera. Comparisons between entoptychine gophers and contemporaneous rodent taxa show little ecomorphological overlap and suggest that the succession of burrowing rodent taxa on the landscape may have had more to do with habitat partitioning than competition. K E Y W O R D S burrowing, Castoridae, ecomorphology, functional morphology, Heteromyidae, resource partitioning

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Evolution of woodcutting behaviour in Early Pliocene beaver driven by consumption of woody plants

Plint

Longstaffe

Ballantyne

et al. 2020

Sci Rep

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Here, we present stable carbon and nitrogen isotope data for Pliocene-age (i) plant macrofossils and (ii) bone collagen from High Arctic Dipoides sp. subfossil remains. The specimens originate from a peat deposit at the Beaver Pond fossil site, located on Ellesmere Island (locally known as Umingmak Nuna, meaning "land of muskoxen"), situated within the Canadian Arctic Archipelago (78° 33′ N, 82° 25′ W) (Fig. 1). We reconstruct High Arctic Dipoides sp. palaeodiet within the context of coeval terrestrial and freshwater plant macrofossil remains excavated from the same ~ 4 Ma old peat layer. The Beaver Pond site provides a very rare opportunity for such a palaeodiet reconstruction using coeval herbivore and plant remains.

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Skeletal Morphology of Palaeocastor peninsulatus (Rodentia, Castoridae) from the Fort Logan Formation of Montana (early Arikareean): Ontogenetic and Paleoecological Interpretations

Cited by 10 publications

References 28 publications

New Rodent Material from the John Day Formation (Arikareean, Middle Oligocene to Early Miocene) of Oregon

New Rodent Material from the John Day Formation (Arikareean, Middle Oligocene to Early Miocene) of Oregon

Locomotory adaptations in entoptychine gophers (Rodentia: Geomyidae) and the mosaic evolution of fossoriality

Evolution of woodcutting behaviour in Early Pliocene beaver driven by consumption of woody plants

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