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Youngoolithus xiaguanensis
Taxonomy
Youngoolithus xiaguanensis was named by Zhao (1979). It is considered to be a form taxon. Its type specimen is IVPP V5783, an egg, and it is not a trace fossil. Its type locality is Houzhuang village, Xiaguan Basin (IVPP), which is in a Turonian/Campanian terrestrial mudstone/conglomerate in the Majiacun Formation of China.
Synonymy list
Year | Name and author |
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1979 | Youngoolithus xiaguanensis Zhao pp. 304-305 |
1994 | Youngoolithus xiaguanensis Mikhailov et al. p. 92 |
2002 | Youngoolithus xiaguanensis Cousin p. 46 |
2002 | Youngoolithus xiaguanensis Zhou and Feng p. 69 |
2006 | Youngoolithus xiaguanensis Simón p. 518 |
2009 | Youngoolithus xiaguanensis Liang et al. p. 1591 |
2010 | Youngoolithus xiaguanensis Zhang p. 218 figs. 8-9 |
2013 | Youngoolithus xiaguanensis Fernández p. 94 |
2013 | Youngoolithus xiaguanensis Zou et al. p. 105 |
2018 | Youngoolithus xiaguanensis Zheng et al. p. 900 |
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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.
†Youngoolithus xiaguanensis Zhao 1979
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Diagnosis
Reference | Diagnosis | |
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S.-K. Zhang 2010 | Eggs olive-shaped, arranged in rows. Eggshell typically composed of 2 - 4 superimposed prismatic shell units. Growth lines undeveloped. Most pore canals curved and branched. Pore walls separated into small blocks near inner surface of eggshell. |
Measurements
No measurements are available
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Source: subc = subclass, c = class, subp = subphylum | |||||
References: Carroll 1988, Hendy et al. 2009 |
Age range: base of the Early/Lower Turonian to the top of the Middle Campanian or 93.50000 to 70.60000 Ma
Collections: one only
Time interval | Ma | Country or state | Original ID and collection number |
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Early/Lower Turonian - Middle Campanian | China (Henan) | Youngoolithus xiaguanensis (type locality: 55688) |