Gerastos

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]

Gerastos Temporal range: Early-Middle Devonian PreꞒ Ꞓ O S D C P T J K Pg N
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
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

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.^{[citation needed]}