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Triprismatoolithus stephensi

Reptilia

Taxonomy
Triprismatoolithus stephensi was named by Jackson and Varricchio (2010). It is considered to be a form taxon. Its type specimen is ES 101, 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
2010Triprismatoolithus stephensi Jackson and Varricchio p. 1146 figs. 3-4
2012Triprismatoolithus stephensi Agnolin et al. p. 36
2014Triprismatoolithus stephensi Moreno-Azanza et al. p. 848
2014Triprismatoolithus stephensi Sellés et al. p. 49
2016Triprismatoolithus stephensi Fernández p. 95

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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
RankNameAuthor
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Theropoda()
genusTriprismatoolithus
speciesstephensi

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.

†Triprismatoolithus stephensi Jackson and Varricchio 2010
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Diagnosis
ReferenceDiagnosis
F. D. Jackson and D. J. Varricchio 2010Although no unambiguous autapomorphies are recognized, the oospecies can be differentiated by the following unique combination of characters: three structural layers of calcite in eggs 30 mm × 75 mm; laminated external layer, surface ornamentation consisting of low round, evenly distributed tuber- cles; shell thickness 525–850 μm. Differs from Elongatoolithus oospecies and Continuoolithus canadensis (Incertae sedis) in having three structural layers, visible prismatic columns throughout layer two, and smaller egg size. Differs from eggs in the Prismatoolithidae (including fossil and extant avian eggs) in having surface ornamentation and abrupt contact between the prismatic and external layers.
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: solitaryo
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: carnivoreo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2004-12-14 12:50:08
Modified: 2004-12-14 14:50:08
Source: o = order
Reference: Marsh 1875

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

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Campanian83.5 - 70.6USA (Montana) Triprismatoolithus stephensi (94368 type locality: 102177)