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Megasteges
Taxonomy
Megasteges was named by Waterhouse (1975) [Sepkoski's age data: P Dora Sepkoski's reference number: 1066].
It was assigned to Aulosteginae by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Aulostegidae by Shen et al. (2003).
It was assigned to Aulosteginae by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Aulostegidae by Shen et al. (2003).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Megasteges Waterhouse p. 6 |
| 2000 | Megasteges Williams et al. p. 587 |
| 2002 | Megasteges Sepkoski |
| 2003 | Megasteges Shen et al. p. 71 |
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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. †Megasteges Waterhouse 1975
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†Megasteges geniculatus Shen et al. 2003
†Megasteges nepalensis Waterhouse 1975
†Megasteges randsi Hill 1950
†Megasteges septentrionalis Etheridge Jr. 1907
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 2 | 25.9 | 24.0 | 28.0 | 26.0 | 2.83 |
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| Source: subo = suborder, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004, Williams et al. 2000 | |||||
Age range: base of the Artinskian to the top of the Changhsingian or 290.10000 to 252.17000 Ma
Collections (55 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Artinskian | Australia (Queensland) | M. randsi (66269 66271 66272 85855 85864 103221 103222 103223 103894 103975 103977 103978 104737) | |
| Wuchiapingian | Australia (Western Australia) | M. septentrionalis (101405) | |
| Wuchiapingian | China (Xizang) | M. nepalensis (60579 60580 121159) M. nepalensis, M. geniculatus (60582) M. sp., M. geniculatus (60587) | |
| Wuchiapingian | Nepal | M. sp. (43118) | |
| Wuchiapingian | Australia (Northern Territory) | Aulosteges septentrionalis (88408) M. septentrionalis (74749) Strophalosia sp. (88409) | |
| Changhsingian | Nepal | M. nepalensis (43166 43167 43170 43172 43177 43178 43185 43187 43189 43190 43191 43192 43194 43198 43199 43216 43217 43218 43220 43230 43231 43235 43237 43242 43254 43256 43257 43277 43278 43279 120490) M. sp. (62447) |