Gerastos of Morocco
Order Proetida
Family Proetidae
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).
Family Proetidae
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.
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.
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.
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
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.
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.