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Pachymyonia morrisi
Taxonomy
Maeonia morrisii was named by Etheridge (1919). It is a 3D body fossil. Its type locality is Harper's Hill, near Allandale, West Maitland (Dun coll), which is in a Sakmarian coastal sandstone in the Allandale Formation of Australia. It is the type species of Pachymyonia.
It was recombined as Pachymyonia morrisii by Dun (1932); it was recombined as Myonia morrisi by Runnegar (1967); it was recombined as Myonia (Pachymyonia) morrisi by Clarke (1992); it was recombined as Pachymyonia morrisi by Clapham (2015).
It was recombined as Pachymyonia morrisii by Dun (1932); it was recombined as Myonia morrisi by Runnegar (1967); it was recombined as Myonia (Pachymyonia) morrisi by Clarke (1992); it was recombined as Pachymyonia morrisi by Clapham (2015).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1919 | Maeonia morrisii Etheridge Jr. p. 186 figs. Pl 28, figs 7, 8 |
| 1932 | Pachymyonia morrisii Dun p. 412 figs. Pl 51, fig 1 |
| 1932 | Myonia davidis Dun p. 413 figs. Pl 51, fig 4; pl 52, fig 4 |
| 1932 | Myonia farleyensis Dun p. 413 figs. Pl 51, figs 5,6; pl 52, fig 5 |
| 1967 | Myonia morrisi Runnegar p. 53 figs. Pl 4, figs 3-5; pl 5, figs 1-11, 16-17; pl 12, fig 4 |
| 1992 | Myonia (Pachymyonia) morrisi Clarke p. 30 figs. 16A-D |
| 2015 | Pachymyonia morrisi Clapham |
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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.
†Pachymyonia morrisi Etheridge Jr. 1919
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Invalid names: Myonia davidis Dun 1932 [synonym], Myonia farleyensis Dun 1932 [synonym]
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 5 | 38.4 | 32.0 | 44.0 | 41.0 | 5.89 | |
| valve height | 5 | 38.7 | 25.1 | 74.7 | 36.7 | 19.2 |
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| Source: g = genus, c = class | |||||
| References: Aberhan et al. 2004, Clapham 2015 | |||||
Age range: base of the Sakmarian to the top of the Artinskian or 293.52000 to 279.30000 Ma
Collections (17 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Sakmarian | Australia (Tasmania) | Myonia morrisi (105481 105484 105490 105493 131773) | |
| Sakmarian | Australia (New South Wales) | Maeonia morrisii (type locality: 133333) Pachymyonia morrisii (134517) | |
| Artinskian | Australia (New South Wales) | Myonia davidis (132321 136669) Myonia farleyensis (101324) | |
| Artinskian | Australia (Queensland) | Myonia morrisi (85046 85047 85855 135928 135929 135931 135932) |