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Helmolepis
Taxonomy
Helmolepis was named by Stensiö (1932) [Sepkoski's age data: Tr l]. It is not extant. Its type is Helmolepis manis.
It was assigned to Perleididae by Nybelin (1977); to Perleidiformes by Sepkoski (2002); and to Platysiagidae by Neuman and Mutter (2005), Neuman (2015).
It was assigned to Perleididae by Nybelin (1977); to Perleidiformes by Sepkoski (2002); and to Platysiagidae by Neuman and Mutter (2005), Neuman (2015).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1932 | Helmolepis Stensiö |
| 1977 | Helmolepis Nybelin p. 1 |
| 2002 | Helmolepis Sepkoski |
| 2005 | Helmolepis Neuman and Mutter p. 27 |
| 2015 | Helmolepis Neuman p. 567 |
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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. †Helmolepis Stensiö 1932
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†Helmolepis cyphognathus Neuman and Mutter 2005
†Helmolepis gracilis Stensiö 1932
†Helmolepis manis Mutter 2005
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| Reference: Carroll 1988 | |||||
Age range: base of the Griesbachian to the top of the Smithian or 251.90200 to 248.10000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Griesbachian | Greenland | H. gracilis (120896 130539 130540 130541 130543) | |
| Dienerian | Madagascar | H. manis (130542) | |
| Smithian | Canada (British Columbia) | H. cyphognathus (90301 105083 119093 119094) |