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Taxonomy
Hemiarges aquilonius was named by Whittington (1961). Its type specimen is GSC 15242, a cephalon/head (cranidium), and it is a cast. Its type locality is Locality 21, which is in a Ludlow marine reef rocks in the Read Bay Formation of Canada.
It was recombined as Richterarges aquilonius by Adrain (1994).
It was recombined as Richterarges aquilonius by Adrain (1994).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1961 | Hemiarges aquilonius Whittington |
| 1994 | Richterarges aquilonius Adrain p. 1084 |
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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.
†Richterarges aquilonius Whittington 1961
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Whittington et al. 1997, Aberhan et al. 2004 | |||||
Age range: Ludfordian or 425.00000 to 422.70000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ludlow | Canada (Northwest Territories) | Hemiarges aquilonius (type locality: 188900) | |
| Ludfordian | Canada (Nunavut) | Hemiarges aquilonius (229371) |