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Gerastos of Morocco

Order Proetida
Family Proetidae
Genus Gerastos

These rather inconspicuous trilobites are locally so common that diggers refer to them as 'izzi' (flies). Their common occurrence however, makes these trilobites invaluable for scientific research. For an introduction to common Gerastos of Morocco, see Gibb & Chatterton (2010).

Name: Gerastos tuberculatus marocensis Chatterton et al, 2006
Stratigraphy: Timrhanrhart formation, Emsian
Locality: Foum Zguid

The glabella on this Gerastos shows a much coarser tuberculation as compared to the segments. There is a distinct tuberculated subocular ridge and the librigane end in a short but distinct spine. The overview of different specimens in Gibb & Chatterton (2010) seems to indicate a fair amount of morphological variation in this subspecies.
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Name: Gerastos cuvieri malisus Gibb & Chatterton, 2010
Stratigraphy: El Otfal formation, Eifelian
Locality: Jebel Ofaten

The glabella on this Gerastos shows weak tuberculation and genal spines are absent.
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Name: Gerastos hammii Gibb & Chatterton, 2010
Stratigraphy: El Otfal formation, Eifelian
Locality: Saredrar

Slender Gerastos with fine glabellar tuberculation and genal spines.
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​Name: Gerastos lisanrasus Gibb & Chatterton, 2010 
Stratigraphy: Ceratarges couche, Eifelian
Locality: Jebel Zireg

Gerastos with a distinct glabellar prosopon reminiscent of a tongue.
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Name: Gerastos sp. (aff. tuberculatus marocensis)
Stratigraphy: Otarionella couche, El Otfal formation, Eifelian
Locality: Jebel Issoumour
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References
Chatterton B., Fortey R., Brett K., Gibb S., McKellar R. 2006. Trilobites from the upper Lower to Middle Devonian Timrhanrhart Formation, Jbel Gara el Zguilma, southern Morocco.
Paleontographica Canadiana 25, 182pp.
Gibb S. & Chatterton B., 2010, Gerastos (Order Proetida; Class Trilobita) from the Lower to Middle Devonian of the southern Moroccan Anti-Atlas region. Paleontographica Canadiana 30, 89pp.
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    • Scientific papers
    • Other articles
    • Resources for educators
  • Contact