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Ariaspis
Taxonomy
Ariaspis was named by Denison (1963) [Sepkoski's age data: "S (Wenl-u) - D (Sieg)?"]. Its type is Ariaspis ornata.
It was assigned to Cyathaspidae by Denison (1963); to Pteraspidomorphes by Sepkoski (2002); and to Ariaspididae by Elliott and Swift (2010) and Van Der Laan (2019).
It was assigned to Cyathaspidae by Denison (1963); to Pteraspidomorphes by Sepkoski (2002); and to Ariaspididae by Elliott and Swift (2010) and Van Der Laan (2019).
Species
A. arctata, A. ornata (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1963 | Ariaspis Denison p. 120 |
| 2002 | Ariaspis Sepkoski |
| 2010 | Ariaspis Elliott and Swift p. 1876 |
| 2019 | Ariaspis Van Der Laan p. 16 |
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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. †Ariaspis Denison 1963
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†Ariaspis arctata Elliott and Swift 2010
†Ariaspis ornata Denison 1963
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. H. Denison 1963 | The dorsal shield is relatively broad and weakly vaulted. There is no median process on the rostral margin, but the preorbital processes are strongly developed. Narrow lateral laminae extend from the orbits to the branchial openings and are separated fromtherestoftheshieldbysharpdownwardangulations. There are no postbranchial lobes, and the postero-lateral corners of the shield are small points. The posterior edge of the dorsal shield is nearly transverse except for the incorporation of a small, median, projecting scale. No separate epitega are distinguishable. |
Measurements
No measurements are available
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| Source: subp = subphylum, p = phylum | |||||
| Reference: Kiessling 2004 | |||||
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Silurian | Canada (Yukon) | A. ornata (185831) | |
| Homerian | Canada (Northwest Territories) | A. n. sp., A. ornata (497) | |
| Ludlow - Pridoli | Canada (Nunavut) | A. sp. (237773) | |
| Pridoli | Canada (Nunavut) | A. arctata (185830) |