Second triconodont dentary from the Early Cretaceous of Maryland

Rose, Kenneth D.; Cifelli, Richard L.; Lipka, Thomas R.

doi:10.1671/0272-4634(2001)021[0628:stdfte]2.0.co;2

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…2006) and from the anomalously large Repenomamus . Almost no postcranial material can be confirmed for the less inclusive Triconodontidae, except the fragmentary elements of Priacodon fruitaensis (Rasmussen & Callison 1981; Engelmann & Callison 1998; but see Jäger et al . 2020 and the Discussion, below) and an undescribed specimen, AMNH FM 144196.…”

Section: Methodsmentioning

confidence: 99%

High‐precision body mass predictors for small mammals: a case study in the Mesozoic

Huang,

Wilson,

Bhullar

et al. 2024

Palaeontology

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Body mass is a pivotal quantity in palaeobiology but must be inferred from an imperfect fossil record. We analyse the performance of regression models derived from various dentoskeletal predictors in mammals to inform fossils from the early, Mesozoic history of this radiation. Our focus is on the critical small end of the size spectrum; critical because the earliest mammals were small, because small size persisted onto the stems of the major extant radiations, and because small mammals compose a large proportion of crown diversity. The sampling strategy is diverse in terms of both phylogeny and skeletal predictors: the former allows a general application, while the latter enables comparison of various models. Linear regressions based on extant small mammals indicate a universal correlation of body mass with observed measurements, but with clear differences in precision. Postcranial predictors outperform jaw and dental metrics, with certain femoral joint dimensions providing surprisingly precise predictions. Our results indicate complex patterns of size evolution within the small‐bodied category, including the possibility that multiple Mesozoic species approached the theoretical lower limit of mammalian body size. The ability to study such dynamics only becomes possible when predicting body mass within a strict, highly focused phylogenetic context. The heuristic value of the models we provide here is not limited to the Mesozoic but is applicable to small‐bodied mammals of any geologic age.

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Section: Methodsmentioning

confidence: 99%

High‐precision body mass predictors for small mammals: a case study in the Mesozoic

Huang,

Wilson,

Bhullar

et al. 2024

Palaeontology

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show abstract

“…and m1-3, described by Cifelli et al (1999). An edentulous right dentary described by Rose et al (2001), USNM 497730, is also likely referable to the species. Description and remarks.…”

Section: Solemydidae Lapparent De Broin Andmentioning

confidence: 97%

“…USNM locality 41614 has yielded a diverse vertebrate fauna (e.g., Lipka, 1998;Kranz, 1998a). To date, a lungfish (Frederickson et al, 2016), a turtle (Lipka et al, 2006), two mammals (Cifelli et al, 1999;Rose et al, 2001;Cifelli et al, 2013), and multiple dinosaurs (Gilmore, 1921;Kranz, 1998a;Brownstein, 2017) have been formally described.…”

Section: Geologic Settingmentioning

confidence: 99%

“…The dentary differs from other Alticonodontinae in the presence of Meckel's groove on its lingual side. The dental formula is unknown, although a premolar count of four seems likely (Rose et al, 2001). The last two premolars resemble those, where known, for other triconodontids: they bear four cusps and are asymmetrical in lateral view, with a basally-placed cusp b, a tall, posteriorly-inclined cusp a, cusp c on the distal flank of cusp a about halfway down, and a small, basally placed and posteriorly projecting d cusp (cusp terminology follows Crompton and Jenkins, 1968).…”

Section: Solemydidae Lapparent De Broin Andmentioning

confidence: 99%

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Faunal composition and paleoenvironment of the Arundel Clay (Potomac Formation; Early Cretaceous), Maryland, USA

Frederickson¹,

Lipka²,

Cifelli³

2018

Palaeontol Electron

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The Arundel Clay facies of the Potomac Group represents one of the few Lower Cretaceous vertebrate-bearing deposits in the Atlantic coastal plain. Vertebrate fossils from this unit have been known for more than 150 years, but thus far formal descriptions have mainly concentrated on its dinosaurs and mammals. Herein, we eport on a moderately diverse faunal assemblage (USNM 41614) from Dinosaur Park in Prince Georges County, Maryland. This assemblage is represented by 306 disarticulated macro-and microfossils that largely consist of teeth and scales (89%). This vertebrate fauna includes two species of hybodont sharks, multiple semionotid fishes, one species of lungfish, three species of turtle, three families of neosuchian crocodilians, six species of dinosaurs, and two species of mammals. Combined with other historical collections from this unit, these new additions to the fauna show that the Arundel was a far more robust and diverse ecosystem than previously envisaged, broadly similar in composition to contemporaneous units of western North America. The Arundel assemblage differs, however, from those in many other Lower Cretaceous sites in that it is dominated numerically by Hybodus and goniopholidid crocodylomorphs, which together comprise 58% of catalogued specimens. Similarly, this sample entirely lacks lissamphibians and lepidosaurs. Traditionally, the Arundel has been interpreted as being of fluvial origin, deposited in a freshwater system of stranded channels or oxbows. Based on faunal composition, together with published geological and sedimentological evidence, we propose that at least some of the Arundel facies was deposited in close proximity to the Atlantic Ocean.

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Squamates from the Jurassic and Cretaceous of North America

Nydam

2013

Palaeobio Palaeoenv

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Second triconodont dentary from the Early Cretaceous of Maryland

Cited by 8 publications

References 22 publications

High‐precision body mass predictors for small mammals: a case study in the Mesozoic

High‐precision body mass predictors for small mammals: a case study in the Mesozoic

Faunal composition and paleoenvironment of the Arundel Clay (Potomac Formation; Early Cretaceous), Maryland, USA

Squamates from the Jurassic and Cretaceous of North America

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