Aglaspis spinifer
| Aglaspis spinifer | ||||||||||||
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Aglaspis spinifer |
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| Temporal occurrence | ||||||||||||
| upper Cambrian | ||||||||||||
| 497 to 485.4 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Aglaspis spinifer | ||||||||||||
| Raasch , 1939 | ||||||||||||
Aglaspis spinifer is an extinct species of the arthropods (Arthropoda) from the Upper Cambrian .
features
The head plate was semicircular and ended laterally in spikes reaching up to the second tergite . The dorsal eyes were smooth and centered. The trunk consisted of 11 tergites that became narrower towards the tail spine, which ended laterally in pleural spines that were initially short, then became longer and more strongly curved backwards. The tail spine ( telson ) was oval to circular in cross section at the base and then became pointed and long. The first pair of antenna-like extremities stood facing forward at eye level. The other extremities were similar and protruded sideways.
Locations
Aglaspis spinifer was found only in the St. Lowrence Formation, three miles east of Gotham, Richland County , Wisconsin .
Systematics
The species was first described by Gilbert Oscar Raasch in 1939 and served as the name-bearing type of the family Aglaspididae and the order Aglaspidida .
swell
literature
- DEG Briggs, DL Bruton, HB Whittington: Appendages of the arthropod Aglaspis spinifer (Upper Cambrian, Wisconsin) and their significance . Palaeontology 22, 1979: 167-180. (PDF; 2.08 MB)
Individual evidence
- ^ GO Raasch: Cambrian Merostomata . Special Papers of the Geological Society of America 19, 1939: 1-146.
- ^ P. van Roy: An aglaspidid arthropod from the Upper Ordovician of Morocco with remarks on the affinities and limitations of Aglaspidida . Transactions of the Royal Society of Edinburgh: Earth Sciences 96, 2006: 327-350. PDF