Gerastos

Gerastos; Temporal range: Upper Pragian PreꞒ Ꞓ O S D C P T J K Pg N
	Gerastos tuberculatus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Proetida
Family:	†Proetidae
Genus:	†Gerastos; Goldfuss, 1843
Species
	G. granulosus Goldfuss, 1843 ; G. kesselaeri Van Viersen, Taghon & Magrean, 2019[1] ; G. silvicultrix Van Viersen, Taghon & Magrean, 2019[1] ; G. tuberculatus marocensis Chatterton et al., 2006 ;

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.[2]

It was described by Goldfuss in 1843.[2]

Distribution

Gerastos has been found in the Devonian of Belgium, Germany, the Czech Republic and Morocco.[2]

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.[3][4]

Length rarely exceeds 3 cm.

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References

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 2018-04-12.
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.
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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[GB2212trilobites-1] 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.

[:0-2] "Fossilworks: Hollardops". fossilworks.org. Retrieved 2018-04-12.

[3] 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.

[4] 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.