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Undulatoolithus pengi
Taxonomy
Undulatoolithus pengi was named by Wang et al. (2013). It is considered to be a form taxon. Its type specimen is egg clutch, an egg, and it is a 3D body fossil. Its type locality is Changxi, Pingxiang, which is in a Cretaceous terrestrial horizon in the Zhoutian Formation of China. It is the type species of Undulatoolithus.
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Undulatoolithus pengi Wang et al. p. 196 fig. 2 |
| 2025 | Undulatoolithus pengi Hedge et al. p. 9 |
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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.
†Undulatoolithus pengi Wang et al. 2013
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Q. Wang et al. 2013 | Elongated egg type with a polar axis length of about 19.36 cm and equatorial diameter of 8.35 cm, giving a shape index is 43.1. The outer surface of the eggshell is sculptured with nodes and longitudinally aligned ridges, and the ridges is 0.67 mm in height, about half of the entire eggshell thickness. The eggshell thickness is 0.78mm (excluding ornamentation) or 1.46 mm (including ornamentation). Cone layer is thin, 1/8 or 1/4 of eggshell thickness. There is gradational boundary between cone layer and columnar layer. | |
| J. Hedge et al. 2025 | TST ranges from 0.78–2.16 mm (including ornamentation). The outer
surface of the eggshell is ornamented with nodes and longitudinally aligned ridges, and the ridges are ca. 1/2 of the TST. CL:ML ratio ranges from 4:1–8:1, with a gradational boundary between layers. |
Measurements
No measurements are available
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| Source: o = order | |||||
| References: Kiessling 2004, Marsh 1875 | |||||
Age range: Early/Lower Cenomanian or 100.50000 to 93.90000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Cenomanian | USA (Utah) | Undulatoolithus pengi (239610) | |
| Late/Upper Cretaceous | China (Jiangxi) | Undulatoolithus pengi (type locality: 153398) |