A new turtle from the Arundel Clay facies (Potomac Formation, Early Cretaceous) of Maryland, U.S.A.

Lipka, Thomas R.; Therrien, François; Weishampel, David B.; Jamniczky, Heather A.; Joyce, Walter G.; Colbert, Matthew W.; Brinkman, Donald B.

doi:10.1671/0272-4634(2006)26[300:antfta]2.0.co;2

Cited by 56 publications

(106 citation statements)

References 17 publications

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“…This would be in contradiction with their usual interpretation as basal pancryptodires more or less closely related to xinjiangchelyids (e.g., Young & Chow 1953;Ye 1994;Danilov & Parham 2008), but further investigation is needed on this point. In the present analysis, Arundelemys dardeni is nested within pleurosternids rather than being more basal than the pleurosternid-baenid dichotomy as previously suggested (Lipka et al 2006). This is more in agreement with available data: e.g., presence of a maxillapostorbital contact.…”

Section: Discussionsupporting

confidence: 90%

“…9) and that the data set strictly supports a topology where P. bullockii and G. plicatulus are more closely related to each other than either is to A. dardeni. This study differs from Lipka et al (2006) in finding A. dardeni within pleurosternids, whereas it was considered a paracryptodire more basal than the clade Pleurosternidae + Baenidae by the latter authors. The node Pleurosternon bullockii + Glyptops plicatulus is u n a m b i g u o u s l y s u p p o r t e d b y t h e f o l l o w i n g synapomorphies in the Adams consensus: contact between basisphenoid and vomer (ch.…”

Section: Pleurosternidae Cope 1868contrasting

confidence: 83%

“…The anterior process of the frontal in that species is similar in development to that of Arundelemys dardeni (Evans & Kemp 1976: fig. 1A; Lipka et al 2006: fig. 2A, F).…”

Section: Charactersmentioning

confidence: 99%

“…Arundelemys dardeni, from the Early Cretaceous of Maryland, USA, was described by Lipka et al (2006) as a basal paracryptodire. The meiolaniids Ninjemys oweni from the Pleistocene of Australia and Niolamia argentina from the ?Eocene of Argentina (Gaffney 1996) are included in order to partly bridge the temporal and morphological gap between Meiolania platyceps and other turtles.…”

Section: Taxon Samplingmentioning

confidence: 99%

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Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata)

Anquetin¹

2017

Preprint

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Recent discoveries from the Late Triassic and Middle Jurassic have significantly improved the fossil record of early turtles. These new forms offer a unique opportunity to test the interrelationships of basal turtles. Nineteen fossil species are added to the taxon sample of the most comprehensive morphological phylogenetic analysis of the turtle clade. Among these additional species are recently discovered forms (e.g., Odontochelys semitestacea, Eileanchelys waldmani, Condorchelys antiqua), taxa generally omitted from previous analyses (e.g., chengyuchelyids, Sichuanchelys chowi) and species included in a phylogenetic analysis for the first time (Naomichelys speciosa and Siamochelys peninsularis). The coding of several characters is reassessed in light of recent observations, but also in order to reduce unwarranted assumptions on character and character state homologies. Additional characters from previous analyses, as well as five new ones, are also included, resulting in a data matrix of 178 characters scored for 86 turtle species and 7 fossil outgroups.The data set resolves the relationships of most newly included taxa, with the exception of Sichuanchelys chowi and 'Chengyuchelys' dashanpuensis. The phylogenetic placement of Heckerochelys romani, Condorchelys antiqua and Eileanchelys waldmani as stem turtles more derived than Kayentachelys aprix but more basal than Meiolania platyceps and Mongolochelys efremovi is corroborated. The relationships of chengyuchelyids remain unclear and more investigation is needed regarding these forms, yet interestingly they are unstable with respect to stem turtles. In contrast to previous analyses, Arundelemys dardeni is placed within pleurosternids. Siamochelys peninsularis falls within xinjiangchelyids. Perhaps the most salient conclusion of the present study is the placement of Naomichelys speciosa as a basal member of a clade uniting meiolaniids, Mongolochelys efremovi and Otwayemys cunicularius. This clade of rather large stem turtles was spread worldwide during the Mesozoic at least and persisted up until the Pleistocene with meiolaniids.This work is licensed under the Creative Commons Attribution 4.0 International License.CC-BY 4.0

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Section: Discussionsupporting

confidence: 90%

Section: Pleurosternidae Cope 1868contrasting

confidence: 83%

“…The anterior process of the frontal in that species is similar in development to that of Arundelemys dardeni (Evans & Kemp 1976: fig. 1A; Lipka et al 2006: fig. 2A, F).…”

Section: Charactersmentioning

confidence: 99%

Section: Taxon Samplingmentioning

confidence: 99%

See 2 more Smart Citations

Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata)

Anquetin¹

2017

Preprint

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“…This clade is diagnosed by the presence of the internal carotid foramen located halfway between the contact of the basisphenoid and the pterygoid, as well as a small fenestra perilymphatica (Gaffney, 1979;Lipka et al, 2006;Joyce, 2007). Baenidae is the more speciose clade and is largely composed of the subclade Baenodda (sensu Brinkman, 2003), which includes Plesiobaena spp., Palatobaena spp., Boremys spp., Eubaena cephalica (Hay, 1904), Stygiochelys estesi Gaffney and Hiatt, 1971, Baena arenosa Leidy, 1870, andChisternon undatum (Leidy, 1872).…”

Section: Introductionmentioning

confidence: 99%

A new baenid turtle from the Upper Cretaceous (Maastrichtian) Hell Creek Formation of North Dakota and a preliminary taxonomic review of Cretaceous Baenidae

Lyson

Joyce

2010

Journal of Vertebrate Paleontology

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ABSTRACT-A fragmentary skull from the Hell Creek Formation (Maastrichtian) of southwestern North Dakota represents a new taxon of baenid turtle named herein Gamerabaena sonsalla. The length of the frontals, jugal contribution to the labial ridge, and convex contact between the vomer and the pterygoids indicate its affinities with the clade Palatobaena, but the new taxon clearly lacks the great posterior expansion of the triturating surface, complete absence of a lingual ridge, subrectangular skull, and wide angle between the maxillae that diagnose Palatobaena spp. A maximum parsimony analysis provides strong support for G. sonsalla as sister taxon to Palatobaena spp. Gamerabaena sonsalla has several morphological features that are intermediate between Plesiobaena antiqua and the morphologically disparate Palatobaena spp., including orbits that are oriented slightly dorsally and moderately expanded posterior triturating surfaces. Our phylogenetic analysis, combined with stratigraphic arguments, indicates that our skull-based taxon G. sonsalla could belong to the shell-based taxon "Baena" hayi. Similarly, the skull taxa Hayemys latifrons and Eubaena cephalica may be synonymous with the shell taxa Thescelus insiliens and "Baena" hatcheri, respectively.

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A well‐preserved cranium from the Judith River Formation (Montana, USA) reveals the inner ear and neuroanatomy of a Campanian baenid turtle

Smith

Berg

Adrian

2023

The Anatomical Record

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A cranium belonging to a baenid turtle was recently recovered from the lower half of the Judith River Formation, Montana. Badlands Dinosaur Museum (BDM) 004 is a well‐preserved partial cranium that includes the posterior cranial vault, cranial base, and otic capsules. Based on diagnostic characters, the skull can be attributed to Plesiobaena antiqua, which has been previously reported from the Judith River Formation. It also shares with palatobaenines projecting posterior processes of the tubercula basioccipitale and a prominent condylus occipitalis with a deep central pit, demonstrating variation within the Pl. antiqua hypodigm. In a phylogenetic analysis, an operational taxonomic unit of BDM 004 was positioned within Baenodda in an unresolved polytomy with Pl. antiqua, Edowa zuniensis, Palatobaeninae, and Eubaeninae. Microcomputed tomographic (μCT) scans revealed morphology of the middle and inner ear and endocast that are largely unknown in baenids. Semicircular canals of BDM 004 are virtually identical to those of Eubaena cephalica and consistent in dimensions to those of other turtle taxa, including anterior and posterior semicircular canals that are robust and taller than the common crus and diverge from each other at an angle of approximately 90°. The digital endocast reveals a moderately flexed brain with rounded cerebral hemispheres and minimal separation between the metencephalon and myelencephalon. Its well‐preserved columella auris (stapes) is gracile with a posterodorsally flared basis columella. It arcs across the middle ear and flattens near its terminus. This study adds to the understanding of baenid middle and inner ear and neuroanatomical morphology and expands the morphological understanding of Pl. antiqua.

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A new turtle from the Arundel Clay facies (Potomac Formation, Early Cretaceous) of Maryland, U.S.A.

Cited by 56 publications

References 17 publications

Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata)

Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata)

A new baenid turtle from the Upper Cretaceous (Maastrichtian) Hell Creek Formation of North Dakota and a preliminary taxonomic review of Cretaceous Baenidae

A well‐preserved cranium from the Judith River Formation (Montana, USA) reveals the inner ear and neuroanatomy of a Campanian baenid turtle

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