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Megadesmus
Taxonomy
Megadesmus was named by Sowerby (1838) [Sepkoski's age data: P Asse P u]. It is the type genus of Megadesmidae.
It was assigned to Pholadomyoida by Sepkoski (2002); and to Megadesmidae by Morris et al. (1991) and Cairncross et al. (2005).
It was assigned to Pholadomyoida by Sepkoski (2002); and to Megadesmidae by Morris et al. (1991) and Cairncross et al. (2005).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1838 | Megadesmus Sowerby p. 14 |
| 1847 | Cleobis Dana |
| 1988 | Megadesmus (Cleobis) Waterhouse p. 184 |
| 1991 | Megadesmus Morris et al. p. 93 |
| 2002 | Megadesmus Sepkoski |
| 2005 | Megadesmus Cairncross et al. p. 552 |
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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. †Megadesmus Sowerby 1838
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Subg. †Megadesmus (Megadesmus) Sowerby 1838
†Megadesmus borealis Muromtseva 1984
†Megadesmus deflatus Waterhouse 1983
†Megadesmus dembskajae Guskov 1984
†Megadesmus globlosus Sowerby 1838
†Megadesmus globosus Sowerby 1838
†Megadesmus gryphoides de Koninck 1876
†Megadesmus nobilissimus de Koninck 1876
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Invalid names: Edmondia intermedia de Koninck 1876 [synonym]
†Megadesmus ovalis Sowerby 1847
†Megadesmus pristinus Runnegar 1972
†Megadesmus robusta Laseron 1910
†Megadesmus trigonalis Johnston 1887
Invalid names: Cleobis Dana 1847 [synonym]
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 2 | 63.2 | 57.0 | 70.0 | 63.5 | 9.19 | |
| valve height | 22 | 68.4 | 35.9 | 140.0 | 63.1 | 26.8 |
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| Source: o = order, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: base of the Pennsylvanian to the top of the Spathian or 323.20000 to 247.20000 Ma
Collections (76 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Namurian - Westphalian | Australia (New South Wales) | M. sp. (58077) | |
| Pennsylvanian | Argentina (Chubut) | M. sp. (43626) | |
| Asselian | Australia (Tasmania) | M. pristinus (105477) | |
| Asselian | Pakistan | Maeonia gracilis (116446) | |
| Asselian | Afghanistan | M. globosus (88265) | |
| Sakmarian | Australia (Western Australia) | M. sp. (85954) | |
| Sakmarian | Australia (New South Wales) | M. globlosus (133744 152058) M. globosus (120458 152057 214494) M. sp. (120930) | |
| Sakmarian | Australia (Tasmania) | Cardiomorpha gryphoides (144865) M. pristinus (105478 105484 105499) | |
| Sakmarian | China (Xizang) | M. sp. (97289) M. sp. 2 (97290) | |
| Sakmarian | India | M. sp. (89374 89376) | |
| Artinskian | Australia (Queensland) | M. gryphoides (83200 85037 85038 85046 85047 85855 116739) | |
| Artinskian | Australia (Western Australia) | Pachydomus globosus (131600) | |
| Kungurian | Australia (Tasmania) | Notomya trigonalis (144870) | |
| Kungurian | Venezuela (Merida) | M. gryphoides (41505) | |
| Kungurian | Russian Federation | M. borealis (114424) M. dembskajae (114423) | |
| Kungurian | Australia (Queensland) | M. gryphoides (116740) M. sp. (116240) | |
| Roadian | Australia (Tasmania) | M. sp. (105423) | |
| Roadian | Australia (Queensland) | M. deflatus (105126 105129 105138) M. gryphoides (116741) | |
| Roadian | Australia (New South Wales) | Cleobis grandis (161845) Cleobis grandis, Cleobis robusta, Maeonia recta (161842) Cleobis robusta (161850) | |
| Roadian | Russian Federation | M. omolonicus (114210) | |
| Roadian - Wordian | Australia (Tasmania) | Pachydomus globosus (134050) | |
| Wordian | Australia (Queensland) | M. grandis (116743 116744 116745 116746) | |
| Wordian | Australia (New South Wales) | Cleobis grandis, Cleobis gracilis, Cleobis recta (133336) Maeonia gigas (133337) Pachydomus gigas, Pachydomus globosus (133342) Pachydomus globosus (134048) | |
| Wordian | Russian Federation | M. omolonicus (102217) | |
| Wordian - Capitanian | Australia (Queensland) | M. grandis (85041 105131) | |
| Wordian - Wuchiapingian | Australia (Queensland) | Notomya recta (123246) | |
| Capitanian | New Zealand (Southland) | M. robusta (41777) | |
| Wuchiapingian | South Africa (Kwazulu-Natal) | M. sp. (206767) | |
| Wuchiapingian | Australia (Queensland) | M. grandis (83194 104740 116742) Pachydomus globosus (123256 123257) | |
| Wuchiapingian | Australia (Tasmania) | M. grandis (83176 105429 105430 105431) M. grandis, M. gryphoides (51314) | |
| Wuchiapingian | Russian Federation | M. borealis (97378) | |
| Changhsingian | Nepal | M. sp. (43146) | |
| Spathian | Russian Federation | M. gromovi (99908 99909 99917 99918 99919) M. sp. (99911) |