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Palatobaena cohen

Reptilia - Baenidae

Taxonomy
Palatobaena cohen was named by Lyson and Joyce (2009). Its type specimen is YPM 57498, a skeleton (a complete uncrushed skull, mandible, and shell), and it is a 3D body fossil. Its type locality is Turtle Graveyard locality, which is in a Maastrichtian lacustrine - small sandstone/mudstone in the Hell Creek Formation of North Dakota.

Synonymy list
YearName and author
2009Palatobaena cohen Lyson and Joyce pp. 460-465 figs. 3, 5, 6
2015Palatobaena cohen Joyce and Lyson

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
RankNameAuthor
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
Paracryptodira
familyBaenidaeCope 1882
BaenoddaGaffney and Meylan 1988
Palatobaeninae()
genusPalatobaena
speciescohen

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Palatobaena cohen Lyson and Joyce 2009
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Diagnosis
ReferenceDiagnosis
T. R. Lyson and W. G. Joyce 2009Member of Baenidae based on location of the foramen posterius canalis carotici interni between the pterygoid and halfway along basisphenoid; posteriorly expanded triturating surfaces with lingual ridge reduced posteriorly; small or absent dorsal lappet of prefrontal; and well developed pterygoid and basioccipital contact. Member of Palatobaena based on oval skull shape, dorsally oriented orbits, rounded snout, processus pterygoideus externus nearly absent, lack of lingual ridge on triturating surface, lack of nasal midline contact, and obtuse angle formed between swollen maxillae. The following characters distinguish it from Palatobaena bairdi and Palatobaena gaffneyi: bone thins near the upper temporal emargination; slender crista supraoccipitalis that comes to a point posteriorly and has little to no exposure on the skull roof. The following characters distinguishes Pa. cohen from Pa. bairdi: larger contribution of frontal to orbital margin; frontals extend posteriorly beyond posterior margin of orbit; upper temporal emargination extending anterior to the processus trochlearis oticum; smooth reflected rim on the dorsal margin of the cheek emargination; labial ridge deflected ventrally by about 20degrees maximum skull width greater than maximum skull length (Table 1); vomer about 60degrees from the plane of the basicranium.
The following characters distinguishes Pa. cohen from Pa. gaffneyi: orbit larger than maxillary shelf below orbit; well developed pterygoid contact; nasals excavated; processus inferior parietalis forming two distinct crista anteriorly; narial sulcus extending across anterior margin of frontals; tubercula basioccipitale divergent and extending posteriorly nearly as far as occipital condyle articulation.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialuc
Locomotion: actively mobilec
Created: 2017-04-17 15:15:35
Modified: 2017-04-17 15:15:35
Source: c = class, subp = subphylum, uc = unranked clade
References: Carroll 1988, Hendy et al. 2009

Age range: base of the Late/Upper Maastrichtian to the top of the Puercan or 70.60000 to 63.30000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Maastrichtian70.6 - 66.0USA (Montana) Palatobaena cohen (189003)
Late/Upper Maastrichtian70.6 - 66.0USA (North Dakota) Palatobaena cohen (type locality: 122903)
Puercan66.0 - 63.3USA (Colorado) Palatobaena bairdi (118484)