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Spheroolithus choteauensis

Reptilia - Spheroolithidae

Taxonomy
Spheroolithus choteauensis was named by Jackson and Varricchio (2010). It is considered to be a form taxon. Its type specimen is ES 113, an egg, and it is a 3D body fossil. Its type locality is Dave and Joel Quarry (E-2), which is in a Campanian terrestrial horizon in the Two Medicine Formation of Montana.

Synonymy list
YearName and author
2010Spheroolithus choteauensis Jackson and Varricchio p. 1144 fig. 2
2014Spheroolithus choteauensis Moreno-Azanza et al. p. 79
2014Spheroolithus choteauensis Sellés et al. p. 725

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
RankNameAuthor
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Ornithopoda()
—Clypeodonta
—Iguanodontia()
—Dryomorpha
—Styracosterna
—Hadrosauriformes
—Hadrosauroidea()
familySpheroolithidae
genusSpheroolithus
specieschoteauensis

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.

†Spheroolithus choteauensis Jackson and Varricchio 2010
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Diagnosis
ReferenceDiagnosis
F. D. Jackson and D. J. Varricchio 2010Although no unambiguous autapomorphies can be recognized, the oospecies can be differentiated from Spheroolithus albertensis and other Spheroolithus ootaxa by the following unique combination of characters: shell thickness from 660 to 940 μm; relatively smooth to ramotuberculate surface consisting of nodes and undulating ridges, some coalescing; pore opening singular, circular, some slit-like; irregular boundary between radiating spherulites and overlying region of tabular structure, with spherulic/tabular region ratio of approximately 1:3.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yeso
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: gregariouso
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: herbivoresubo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2009-01-03 20:40:05
Modified: 2009-01-03 22:40:05
Source: subo = suborder, o = order
References: Benton 1983, Marsh 1875

Age range: Early/Lower Campanian or 83.50000 to 70.60000 Ma

Collections (4 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Campanian83.5 - 70.6USA (Montana) Hadrosauridae indet. (94368) Spheroolithus choteauensis (type locality: 102177 102178 102179)