A new species of the lungfish <i>Ceratodus</i> (Dipnoi) from the Early Cretaceous of the eastern U.S.A.

Frederickson, Joseph; Lipka, Thomas R.; Cifelli, Richard L.

doi:10.1080/02724634.2016.1136316

Cited by 4 publications

(18 citation statements)

References 21 publications

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“…Kranz (1998a) observed that the fossiliferous parts of the Arundel are comprised almost entirely of silt and clays that are often found within U-or V-shaped profiles with varying depths and lengths. This infilled-channel interpretation has since been repeated, in multiple publications, as the leading explanation for the preservation of the Arundel fauna (e.g., Lipka et al, 2006;Stanford et al, 2011;Frederickson et al, 2016). In light of our additions to and re-study of the vertebrate fauna, we hypothesize a slightly different depositional setting: that the Arundel represents a near-coastal environment, probably within a paludal or swamp system that may have been ephemerally brackish.…”

Section: Depositional Environmentmentioning

confidence: 59%

“…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%

“…Class SARCOPTERYGII Romer, 1955 Subclass DIPNOI Müller, 1846Order CERATODONTIDAE Gill, 1872 Genus CERATODUS Agassiz, 1838 Ceratodus kranzi Frederickson et al, 2016 Material. The holotype, USNM 508543, a partial pterygopalatine tooth plate, described by Frederickson et al (2016). Description and remarks.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…* indicates species not observed here, but published elsewhere. Species data from Marsh (1888), Gilmore (1921), Chinnery et al (1998), Harris (1998), Kranz (1998a,b), Lipka (1998), , Lipka et al (2006), Cifelli et al (2013), Frederickson et al (2016), and Brownstein (2017). contradictory changes to explain the Potomac sequence, including simultaneous elevation of deposits-to account for the shift from nearshore marine deposition in the Patuxent, to terrigenous in the Arundel-coupled with "landward depression of the continental border" to explain the character of Arundel sediments.)…”

Section: Depositional Environmentmentioning

confidence: 99%

“…However, the literature is strongly biased toward the dinosaurs recovered from the unit (e.g., Lull, 1911;Gilmore, 1921;Kranz, 1989;Weishampel and Young, 1998;Lipka, 1998;Brownstein, 2017). Only a few papers describe other vertebrates in any level of detail, with Kranz (1998b), Lipka et al (2006), and Frederickson et al (2016) being three recent exceptions. Here we attempt to rectify this, at least in part, by describing a diverse and ecologically informative assemblage from the Arundel Clay facies.…”

Section: Introductionmentioning

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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Section: Depositional Environmentmentioning

confidence: 59%

Section: Geologic Settingmentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

Section: Depositional Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Frederickson¹,

Lipka²,

Cifelli³

2018

Palaeontol Electron

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A stem lepidosireniform lungfish (Sarcopterygia: Dipnoi) from the Upper Eocene of Libya, North Africa and implications for Cenozoic lungfish evolution

Longrich

2017

Gondwana Research

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New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America

Frederickson

Cifelli

2016

J. Paleontol.

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Ceratodontid lungfishes are generally rare, poorly represented elements of North America’s Mesozoic ecosystems, with previously known maximum diversity in the Late Jurassic. Herein we describe four new species of the form genusCeratodus, from the Cretaceous of the Western Interior, considerably expanding fossil representation of post-Triassic dipnoans in North America. To model taxonomic and morphologic diversity, we adopt a four-fold system of phenetically based species groups, named for exemplars from the Morrison Formation.Ceratodus kirklandin. sp. (Potamoceratodus guentherigroup) andC.kempaen. sp. (C.frazierigroup) represent a hitherto unsampled time interval, the Valanginian.Ceratodus nirumbeen. sp. andC.molossusn. sp. extend the temporal ranges of theC.fossanovumandC.robustusgroups upward to the Albian and Cenomanian, respectively. These new occurrences show that ceratodontids maintained their highest diversity from the Late Jurassic through the mid-Cretaceous (Albian–Cenomanian), an interval of ~60 Myr. The existing record suggests that some of the later (mid-Cretaceous) ceratodontids may have been tolerant of salt water; to date, there is no evidence that they aestivated. Only a few occurrences are known from horizons younger than Cenomanian. Demise of ceratodontids appears to be part of a broader pattern of turnover that occurred at the Cenomanian-Turonian boundary in North America.

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A new species of the lungfish Ceratodus (Dipnoi) from the Early Cretaceous of the eastern U.S.A.

Cited by 4 publications

References 21 publications

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

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

A stem lepidosireniform lungfish (Sarcopterygia: Dipnoi) from the Upper Eocene of Libya, North Africa and implications for Cenozoic lungfish evolution

New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America

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