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Hexalasma
Taxonomy
Hexalasma was named by Soshkina (1928) [Sepkoski's age data: P Leon-m P Dora Sepkoski's reference number: 1240]. It is not extant.
It was synonymized subjectively with Pseudocryptophyllum by Hill (1956).
It was assigned to Polycoeliinae by Hill (1981); to Rugosa by Sepkoski (2002); and to Pentaphyllidae by Fedorowski (2009).
It was synonymized subjectively with Pseudocryptophyllum by Hill (1956).
It was assigned to Polycoeliinae by Hill (1981); to Rugosa by Sepkoski (2002); and to Pentaphyllidae by Fedorowski (2009).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Hexalasma Soshkina |
| 1981 | Hexalasma Hill |
| 2002 | Hexalasma Sepkoski |
| 2009 | Hexalasma Fedorowski p. 576 |
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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.
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Artinskian to the top of the Changhsingian or 290.10000 to 251.90200 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Artinskian | Russian Federation (Respublika Komi) | H. hexaseptatum, H. primitivum (79493) | |
| Artinskian | Russian Federation (Komi) | H. primitivum (79425) | |
| Wordian - Capitanian | Tunisia (Madanin) | H. sp. (42092) | |
| Changhsingian | Russian Federation | H. protoseptatum (131245) |