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Holcacephalus
Taxonomy
Holcacephalus was named by Resser (1938) [Sepkoski's age data: Cm uMid-u Cm Dres-l]. It is not extant.
It was assigned to Norwoodiidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
It was assigned to Norwoodiidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1938 | Holcacephalus Resser |
| 2002 | Holcacephalus Jell and Adrain p. 384 |
| 2002 | Holcacephalus Sepkoski |
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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. †Holcacephalus Resser 1938
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Aberhan et al. 2004, Whittington et al. 1997 | |||||
Age range: base of the Ayusokkanian to the top of the Dresbachian or 499.50000 to 486.85000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Marjumian | USA (Georgia) | H. sp. (64486) | |
| Marjumian | Canada (Quebec) | H. tener (235509) | |
| Ayusokkanian | Kazakhstan | H. bellus (118235 118238 118239) | |
| Dresbachian | USA (Wyoming) | H. sp. (224 227) |