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Laiyangoolithus lixiangensis

Reptilia - Prismatoolithidae

Taxonomy
Laiyangoolithus lixiangensis was named by Wang et al. (2018). It is considered to be a form taxon. Its type specimen is IVPP V 25232, an egg, and it is a 3D body fossil. Its type locality is Jiangjunding, Laiyang, which is in a Coniacian/Santonian terrestrial horizon in the Jiangjunding Formation of China. It is the type species of Laiyangoolithus.

Synonymy list
YearName and author
2018Laiyangoolithus lixiangensis Wang et al. p. 265 fig. 1

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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()
familyPrismatoolithidae
genusLaiyangoolithus
specieslixiangensis

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.

Laiyangoolithus lixiangensis Wang et al. 2018
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Diagnosis
ReferenceDiagnosis
Q. Wang et al. 2018Long-oval egg, the outer surface of eggshell smooth and no ornamentation. Thinner eggshell with average thickness is 0.43 mm. The eggshell units are prismatic and tightly arranged. The boundary between the cone layer and the columnar layer is not clear. Thickness of the cone layer is 0.14 mm, about 1/3 of the eggshell thickness. Cones are sturdy. Apertures between cones are clear. Growth lines are obvious in the cone layer. The edge of the eggshell units is composed of dense calcite. The number of pore is very small, and can be seen as round or irregular shapes in tangential section of eggshell.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Created: 2017-04-17 15:16:03
Modified: 2017-04-17 15:16:03
Source: subc = subclass, c = class, subp = subphylum
References: Hendy et al. 2009, Carroll 1988

Age range: base of the Coniacian to the top of the Santonian or 89.80000 to 83.60000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Coniacian - Santonian89.8 - 83.6China (Shandong) Laiyangoolithus lixiangensis (type locality: 204760)