Erbenochile issoumourensis Moroccan Trilobite

Erbenochile issoumourensis

Trilobites Order Phacopida, Suborder Phacopina, Superfamily Acastoidea, Family Acastidae

Geological Time: Early to Middle Devonian (Late Emsian to Early Eifelian Stage)

Size (25.4 mm = 1 inch): Trilobite is 32 mm long by 22 mm wide on a 95 by105 mm matrix

Fossil Site: Mount Issimour Alnif , Morocco

Code: MT307

Price: $995.00

Erbenochile issoumourensis Moroccan TrilobiteDescription: Elegant example of a member of the Order Phacopida, Superfamily Acastoidea with many fine details present. While most frequently known in the trade as “Big Eye”, this one is actually Erbenochile, and has just become commercially available in limited quantities. The most diagnostic features of this taxon are the high “eye-towers”. Fortey and Chatterton described the related Erbenochile erbeni in September 2003 from a single commercially-prepared specimen, and it created a stampede among collectors. The “wrap around” eyes gave a good panoramic view of the trilobite’s environment, allowing it to keep alert for predator and prey alike. Since fish had recently evolved true jaws, any advantage a prey species could derive would place it at an advantage. This species comes from Mount Issoumour and was described by Chatterton and Gibb less than 5 years ago, with the species name coming from the locality of discovery. Like E. erbeni, it possesses the high “eye tower” but has fewer lenses per vertical file and lacks the distinctive “sunshade” thought to indicate the this one comes from a lower light environment. This one has been prepared with the genal and axial spines all freestanding, quite an achievement from such hard matrix. TThgis species is still offered far less frequently than the more flambuoyant Erbenochile erbeni.

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