Fallotaspididae

Fallotaspididae
Slightly deformed Eofallotaspis from the Campito Formation , United States
Temporal occurrence
Lower Cambrian (Second Series)
524 to 517 million years
Locations
Baltica , Laurentia , Morocco , Siberia
Systematics
Trunk : Arthropoda Class : Trilobites (Trilobita) Order : Redlichiida Subordination : Olenellina Superfamily : Fallotaspidoidea Family : Fallotaspididae
Scientific name
Fallotaspididae
Hupé , 1953

The Fallotaspididae , sometimes also Fallotaspidae , are one of the five families within the trilobite superfamily of the Fallotaspidoidea . They first appeared in the fossil record in the Lower Cambrian and, with Profallotaspis jakutensis, represent one of the four oldest known trilobite species.

etymology

The Fallotaspididae were named after the taxon Fallotaspis , with which the French paleontologist Paul Fallot (1889-1960) was honored. Aspis is derived from the Greek άσπίς for "shield". The fallotaspidids were scientifically described for the first time by Pierre Hupé in 1953.

Distribution and occurrence

The appearance of Profallotaspis jakutensis defines the beginning of the second stage (third series) of the Cambrian in Siberia, the taxon was found in the Pestrotsvet formation on the southeastern Siberian table .

The Fallotaspididae died out before the onset of the fourth series. The last fallotaspidid was Parafallotaspis grata from the Sekwi Formation in northwestern Canada.

The Fallotaspididae are found in Baltica ( Poland , Sweden ), Laurentia (northwestern Canada , southwestern United States ), Morocco, and Siberia .

stratigraphy

The following biostratigraphic trilobite zones were named after Fallotaspididae:

In Laurentia:

• Fallotaspis zone

In Siberia (sorted from young to old):

• Fallotaspis zone or Repinaella zone
• Profallotaspis zone

Development history

As one of the most original trilobite families, the Fallotaspididae play a central role in the phylogenetic development of the trilobites. According to Jell (2003), four side branches split off from them, giving rise to the following trilobite groups:

• Corynexochidae , family of the Corynexochida
• Ellipsocephaloidea , a superfamily of the Ptychopariida . From them yet then split later Agnostina from.
• Redlichiidae , family of the Redlichiida
• Yunnanocephalus , taxon of the Yunnanocephalidae , a family of the Ptychopariida.

As a result, representatives of all the trilobite orders occurring in the Cambrian developed directly or indirectly from the Fallotaspidids: Agnostina, Corynexochida, Ptychopariida and Redlichiida.

Systematics

Fallotaspis longa

The Fallotaspididae family includes the following genera :

• Choubertella
• Daguinaspis
• Eofallotaspis
• Fallotaspis
• Lenallina
• Parafallotaspis
• Pelmanaspis
• Profallotaspis
• Repinaella
• Wolynaspis

Web links

Commons : Fallotaspididae  - collection of images, videos, and audio files

• Sam Gon III: order Redlichiida - family Fallotaspididae

swell

• MJ Benton: The Fossil Record 2 . Chapman & Hall, London 1993, ISBN 0-412-39380-8 .
• F. Gradstein, J. Ogg, A. Smith: A Geologic Time Scale 2004 . Cambridge University Press, 2004, ISBN 0-521-78142-6 .
• Peter A. Jell: Phylogeny of Early Cambrian Trilobites. In: PD Lane, DJ Siveter, BA Fortey: Trilobites and Their Relatives. (= Special Papers in Paleontology. 70). Paleontological Association, 2003, ISBN 0-901702-81-1 , pp. 45-57.