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Spheroolithus
Taxonomy
Spheroolithus was named by Zhao (1979). It is considered to be a form taxon.
It was assigned to Spheroolithidae by Zhao (1979), Mikhailov et al. (1994), Zelenitsky and Hills (1997), Mikhailov (2000), Mohabey (2001), Cousin (2002), Fang et al. (2003), Liang et al. (2009), Jackson and Varricchio (2010), Liu et al. (2013), Zhao et al. (2013), Sellés et al. (2014), Moreno-Azanza et al. (2014), Moreno-Azanza et al. (2016), Zhang et al. (2017) and Zhang (2022).
It was assigned to Spheroolithidae by Zhao (1979), Mikhailov et al. (1994), Zelenitsky and Hills (1997), Mikhailov (2000), Mohabey (2001), Cousin (2002), Fang et al. (2003), Liang et al. (2009), Jackson and Varricchio (2010), Liu et al. (2013), Zhao et al. (2013), Sellés et al. (2014), Moreno-Azanza et al. (2014), Moreno-Azanza et al. (2016), Zhang et al. (2017) and Zhang (2022).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1979 | Paraspheroolithus Zhao p. 332 |
| 1979 | Spheroolithus Zhao p. 332 |
| 1994 | Spheroolithus Mikhailov et al. p. 93 |
| 1994 | Paraspheroolithus Zhao p. 188 |
| 1997 | Spheroolithus Zelenitsky and Hills p. 167 |
| 2000 | Spheroolithus Mikhailov p. 562 |
| 2001 | Spheroolithus Mohabey p. 496 |
| 2002 | Paraspheroolithus Cousin p. 45 |
| 2002 | Spheroolithus Cousin p. 45 |
| 2003 | Paraspheroolithus Fang et al. p. 517 |
| 2003 | Spheroolithus Fang et al. p. 517 |
| 2009 | Paraspheroolithus Liang et al. p. 1590 |
| 2009 | Sphereoolithus Liang et al. p. 1590 |
| 2010 | Spheroolithus Jackson and Varricchio p. 1144 |
| 2013 | Spheroolithus Liu et al. p. 280 |
| 2013 | Paraspheroolithus Zhao et al. p. 4665 |
| 2013 | Spheroolithus Zhao et al. p. 4665 |
| 2014 | Paraspheroolithus Moreno-Azanza et al. p. 79 |
| 2014 | Spheroolithus Moreno-Azanza et al. p. 79 |
| 2014 | Spheroolithus Sellés et al. p. 725 |
| 2016 | Spheroolithus Moreno-Azanza et al. p. 309 |
| 2017 | Paraspheroolithus Zhang et al. p. 191 |
| 2017 | Spheroolithus Zhang et al. p. 191 |
| 2022 | Spheroolithus Zhang p. 62 |
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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.
G. †Spheroolithus Zhao 1979
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†Spheroolithus albertensis Zelenitsky and Hills 1997
†Spheroolithus choteauensis Jackson and Varricchio 2010
†Spheroolithus europaeus Sellés et al. 2014
†Spheroolithus irenensis Chao and Chiang 1974
†Spheroolithus jincunensis Fang et al. 2003
†Spheroolithus maiasauroides Mikhaillov 1994
†Spheroolithus quantouensis Zhang 2022
†Spheroolithus spheroides Young 1954
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Invalid names: Oolithes chiangchiungtingensis Young 1954 [synonym]
†Spheroolithus tenuicorticus Mikhaillov 1994
Invalid names: Paraspheroolithus Zhao 1979 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. D. Jackson and D. J. Varricchio 2010 | Egg shape sub-spherical (elongation ratio = 1.0–1.2), spherulitic eggshell structure and protocanaliculate pore system (Mikhailov, 1994:151, fig. 1f, g). | |
| A. G. Sellés et al. 2014 | Egg shape subspherical to ovate (elongation index, EL = 1.0–1.2), spherulitic eggshell structure with sagenotuberculate ornamentation and protocanaliculate pore system. | |
| S.-K. Zhang 2022 | Spherical to subspherical eggs with 74–99 mm in length, eggshell 2.2–5.5 mm in thickness, cone-shaped eggshell unit assemblages separated by large cavities in the inner portion of eggshell, fusing extensively in the outer portion of eggshell, irregular cavities between eggshell units in the outer portion of eggshell, slender or branched eggshell units separated from each other near the outer surface of eggshell. |