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Placoolithus taohensis
Taxonomy
Placoolithus taohensis was named by Zhao and Zhao (1998). It is considered to be a form taxon. Its type specimen is IVPP V11569.1 (field no. 7530), an egg (nest with 9 eggs), and it is a 3D body fossil. Its type locality is Majiacun, Taohe (IVPP Loc. 7530), which is in a Coniacian/Santonian terrestrial horizon in the Majiacun Formation of China. It is the type species of Placoolithus.
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Placoolithus taohensis Mikhailov p. 79 |
| 1998 | Placoolithus taohensis Zhao and Zhao pp. 284, 291 figs. Pl. I, fig. 1–4 |
| 2002 | Placoolithus taohensis Cousin p. 47 |
| 2002 | Placoolithus taohensis Zhou and Feng p. 69 |
| 2009 | Placoolithus taohensis Liang et al. p. 1591 |
| 2018 | Placoolithus taohensis Zhang et al. p. 677 |
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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.
†Placoolithus taohensis Zhao and Zhao 1998
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Zhao and Z. Zhao 1998 | Eggs nearly spherical and disposed at random in the nest. Eggshells
consisting of incomplete basic structure units. No obvious mark between cone layer and columnar layer. Columns branching asymmetrically. Outer parts of the columns connecting or interlocking, forming a continuous layer taking up 1/2 eggshell thickness or 2/3 columnar height. Few pores on their outer surface. Pore canals very developed, causing a big complex pore system. |