Aglaspidida is an extinct order of aquatic arthropods that were once regarded as primitive chelicerates. However, anatomical comparisons demonstrate that the aglaspidids cannot be accommodated within the chelicerates,[2] and that they lie instead within the Artiopoda, thus placing them closer to the trilobites.[3] Aglaspidida contains the subgroups Aglaspididae and Tremaglaspididae, which are distinguished by the presence of acute/spinose genal angles and a long spiniform tailspine in the Aglaspididae.[1]
| Aglaspidida Temporal range: | |
|---|---|
 | |
| Aglaspis spinifer | |
 | |
| Fossil of Beckwithia typa | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| (unranked): | †Artiopoda |
| (unranked): | †Vicissicaudata |
| Order: | †Aglaspidida Walcott, 1911 |
| Subtaxa[1] | |
| |
Aglaspidid fossils are found in North America (upper Mississippi valley, Missouri and Utah), Europe, Australia, and China. Certain other artiopods are believed to be closely related to the aglaspidids, including the order Strabopida, which includes the genera Strabops, Paleomerus, Parapaleomerus, and possibly Khankaspis.
List of genera
- Aglaspella
- Aglaspis
- Aglaspoides
- Australaglaspis
- Beckwithia
- Chlupacaris
- Chraspedops
- Cyclopites
- Flobertia
- Girardevia
- Glypharthrus
- Quasimodaspis
- Setaspis
- Tremaglaspis
- Tuboculops
- Uarthrus
- Zonoscutum
- Zonozoe
References
External links
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