| Gerastos Temporal range:
| |
|---|---|
| |
| Gerastos tuberculatus from Morocco | |
| |
| Gerastos sp. from Morocco | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | †Artiopoda |
| Class: | †Trilobita |
| Order: | †Proetida |
| Family: | †Proetidae |
| Genus: | †Gerastos Goldfuss, 1843 |
| Species | |
Gerastos is a genus of proetid trilobite in the family Proetidae that lived between the Pragian and Eifelian of the Lower-Middle Devonian, spanning approximately 21 million years.3
It was described by Goldfuss in 1843.3
Distribution
Gerastos has been found in the Devonian of Belgium, Germany, the Czech Republic and Morocco.3
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.45
Length rarely exceeds 3 cm.
References
References
- van Viersen, A. P. (2021). "Type and other species of Gerastos and allied genera (Trilobita, Proetinae) from the Siluro-Devonian". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 299 (2): 185–217. doi:10.1127/njgpa/2021/0964. ISSN 0077-7749. S2CID 233910967.
- Allart P. van Viersen; Peter Taghon; Benedikt Magrean (2019). "Early Middle Devonian trilobites and events in the Nismes – Vireux-Molhain area, southern border of the Dinant Synclinorium (Belgium, northern France)". Geologica Belgica. 22 (1–2): 7–33. doi:10.20341/gb.2019.001.
- "Fossilworks: Hollardops". fossilworks.org. Retrieved 17 December 2021.
- 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 Belgique, Sciences de la Terre. 78: 9–29.
- 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.