Fallotaspis
| Fallotaspis | ||||||||||||
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Fallotaspis longa |
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| Temporal occurrence | ||||||||||||
| Lower Cambrian (Second Series, Third Stage) | ||||||||||||
| 521 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Fallotaspis | ||||||||||||
| Hupé , 1953 a |
Fallotaspis is a genus of the trilobite family Fallotaspididae . It occurs for the first time in the fossil record during the third stage (second series) of the Cambrian (Lower Cambrian) about 521 million years ago BP .
etymology
The genus Fallotaspis was named in honor of the French paleontologist Paul Fallot (1889-1960). Aspis is derived from the Greek άσπίς for "shield".
description
The first scientific description and naming of the taxon was made by Pierre Hupé in 1953.
Cephalon : Large and rounded in a semicircle with long cheek spines that reach back to the first half of the thorax. Facial seams are missing. The glabella is slightly conical and narrowing towards the front. The eye ridges connect to the glabella on the outside of the glabellar lobe LA. In contrast to the rest of the Fallotaspiden, the hypostome is not natant .
Thorax : Up to 21 segments. The third segment ends in an elongated pleural spine that extends to the fourteenth segment.
Pygidium : tiny
Distribution and occurrence
Distribution areas of the genus Fallotaspis can be found on Laurentia (Southwestern United States - Campito Formation ) and in Morocco ( Amouslek Formation and Igoudine Formation ).
stratigraphy
The genus Fallotaspis represents important key fossils in the Lower Cambrian.
Fallotaspis zone
After fallotaspis was fallotaspis zone named - in the oldest Laurentia and Siberia the second oldest Trilobitenleithorizont. It should be noted that the Fallotaspis zone of Siberia does not contain the genus Fallotaspis, but the fallotaspidid genus Repinaella and is consequently also referred to as the Repinaella zone .
Accompanying trilobites in the Fallotaspis zone of Laurentia are:
Trilobites in the Fallotaspis zone or Repinaella zone of Siberia:
- Repinaella
- Bigotina or Bigotinella - to the family of Bigotinidae duly
Systematics
The following types are shown:
- Fallotaspis bondoni NELTNER & POCTEY 1950 (also Fallotaspis cf.bondoni or Olenellus bondoni ) - Laurentia (Campito formation)
- Fallotaspis inexspectatus G. GEYER 1996
- Fallotaspis ljugneri KAUTSKY
- Fallotaspis longa HUPÉ 1953 - Laurentia (Campito formation)
- Fallotaspis longispina HUPÉ 1953 - Morocco, near Taroudannt
- Fallotaspis plana HUPÉ 1953 - Morocco
- Fallotaspis planospinosa HUPÉ 1953 - Morocco
- Fallotaspis tazemmourtensis HUPÉ 1953 - Laurentia (Campito formation) and Morocco (Igoudine formation)
- Fallotaspis typica HUPÉ 1953 - Morocco
Individual evidence
- ^ Lane, PD, Siveter, DJ & Fortey, BA: Trilobites and Their Relatives. Special Papers in Paleontology, 70, pp. 45-57. Paleontological Association