Gerastos

Gerastos
Temporal range: Upper Pragian
Gerastos tuberculatus
Scientific classification
Kingdom:Animalia
Phylum:Arthropoda
Class:†Trilobita
Order:†Proetida
Family:†Proetidae
Genus:†Gerastos
Goldfuss, 1843
Species
  • G. granulosus Goldfuss, 1843
  • G. tuberculatus marocensis Chatterton et al., 2006

Gerastos is a genus of trilobite in the order Proetida that lived between the Pragian and Eifelian of the Lower-Middle Devonian, spanning approximately 21 million years.[1]

It was described by Goldfuss in 1843.[1]

Distribution

Gerastos has been found in the Devonian of Belgium, the Czech Republic and Morocco.[1]

Description

Gerastos has holochroal eyes situated to the side of its enlarged glabella region of the cephalon. The surface of the cephalon can be smooth or covered with pustules.[2][3]

Length rarely exceeds 3 cm.

References

  1. 1 2 3 "Fossilworks: Hollardops". fossilworks.org. Retrieved 2018-04-12.
  2. ↑ Van Viersen, Allart; Prescher, Harald (2008-10-31). "Devonian Proetidae (Trilobita) from the Ardennes Massif (Belgium, N France) and the Eifel Hills (W Germany)". Bulletin de l'Institut Royal des Sciences Naturelles de Belqique, Sciences de la Terre. 78: 9–29.
  3. ↑ Gibb, Stacey; Chatterton, Brian (2010-01-01). "Gerastos (Order Proetida; Class Trilobita) from the Lower to Middle Devonian of the southern Moroccan Anti-Atlas region". Palaeontographica Canadiana. 29: 1–89.
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