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Macroelongatoolithus
Taxonomy
Macroelongatoolithus was named by Li et al. (1995). It is considered to be a form taxon. Its type is Oolithes carlylensis.
It was assigned to Oviraptoridae by Zelenitsky and Currie (2004); and to Elongatoolithidae by Zelenitsky et al. (2000), Cousin (2002), Fang et al. (2003), Jin et al. (2007), Kim et al. (2011), Tanaka et al. (2011), Huh et al. (2014), Simon et al. (2019) and Jin et al. (2020).
It was assigned to Oviraptoridae by Zelenitsky and Currie (2004); and to Elongatoolithidae by Zelenitsky et al. (2000), Cousin (2002), Fang et al. (2003), Jin et al. (2007), Kim et al. (2011), Tanaka et al. (2011), Huh et al. (2014), Simon et al. (2019) and Jin et al. (2020).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1995 | Macroelongatoolithus Li et al. |
| 1995 | Longiteresoolithus Wang and Zhou p. 262 |
| 1998 | Boletuoolithus Bray p. 221 |
| 2000 | Macroelongatoolithus Zelenitsky et al. p. 131 |
| 2002 | Macroelongatoolithus Cousin p. 44 |
| 2003 | Macroelongatoolithus Fang et al. p. 517 |
| 2004 | Macroelongatoolithus Zelenitsky and Currie p. 134A |
| 2007 | Macroelongatoolithus Jin et al. p. 82 |
| 2009 | Longiteresoolithus Liang et al. p. 1591 |
| 2010 | Megafusoolithus Wang et al. |
| 2011 | Macroelongatoolithus Kim et al. p. 18 |
| 2011 | Macroelongatoolithus Tanaka et al. p. 45 |
| 2014 | Macroelongatoolithus Huh et al. p. 220 |
| 2019 | Macroelongatoolithus Simon et al. p. 7 |
| 2020 | Macroelongatoolithus Jin 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.
G. †Macroelongatoolithus Li et al. 1995
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†Macroelongatoolithus carlylei Jensen 1970
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Invalid names: Longiteresoolithus xixiaensis Wang and Zhou 1995 [synonym]
†Macroelongatoolithus goseongensis Kim et al. 2011
†Macroelongatoolithus zhangi Fang et al. 2000
Invalid names: Boletuoolithus Bray 1998 [synonym], Longiteresoolithus Wang and Zhou 1995 [synonym], Megafusoolithus Wang et al. 2010 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. K. Zelenitsky et al. 2000 | Eggs are large, exceeding 380 mm in length; largest reported is 600 mm. Elongation index is 2.6– 3.1. Eggshell thickness averages 2 mm, primarily ranges from 1.8–2.2 mm, total range from 1.38–3.2 mm. Thickness ratio of continuous layer to mammillary layer ranges from 2:1 to 4:1. Ornamentation is variable with typical elongatoolithid pattern in some eggs and very well-developed ornamentation in others. | |
| J. Y. Kim et al. 2011 | Large, elongate eggs, 24-52 cm in length, possibly as long as 60 cm. Elongation index 1.6-3.4. Total range of shell thickness 1.38-3.2 mm. Continous to mammillary layer thickness ratio 1.5:1 to 6.5:1. Angusticanaliculate to oblequicanaliculate pore system. Typical elongatoolithid ornamentation with variable pattern over egg surface. | |
| D. J. Simon et al. 2019 | Large, elongate eggs exceeding 34cm and potentially reaching 61 cm long, with an elongation index of 2.6–3.9. Eggshell thickness, including ornamentation, is 1.38–4.75 mm. Abrupt, undulating boundary separates the CL and ML, and CL:ML ratio widely ranging from 2:1 to 8:1. Crystal splaying across the ML-CL boundary occurs at random intervals. Ornamentation is variable both in type and relief and may grade from dispersituberculate at the poles to lineartuberculate along the middle portion of the length of the egg; smooth patches may occur near poles. Clutches consist of paired eggs in a ring-shaped configuration with an external clutch diameter of ca. 2–3 m. |