Walliserops trifurcatus Trilobite

Walliserops trifurcatus

Trilobites Order Phacopida, Family Acastidae

Geological Time: Middle Devonian

Size: Walliserops trilobite is 65 mm long

Fossil Site: Foum Ziguid, Morocco

WalliseropsDescription: This trilobite is a member of the Order Phacopida, Family Acastidae from the Devonian deposits of Jebel Issoumour, Morocco known commercially as the Trident Comura. The trilobite was named Walliserops trifurcatus by Pierre Morzadec. Chatterton and Brett had erected the genus Parabolops, with the long-forked trident being Parabolops neptunis and the short-forked Parabolops hammi (see my other examples for a fine short-forked example). Some think the differences may be the result of sexual dimorphism. Radical differences between the sexes are common in Arthropods (see some of the scarab beetles, for example). Howevwer, with some half dozen trident variants that particular theory is not viable. Whatever you call it, this is a spectacular example. The occipital, cephalic, and axial spines have been prepared freestanding. The diagnostic trident has been prepared freestanding as well. With the advent of a reliable source of electricity in Morocco, the quality of preparation has improved dramatically over the past few years. I apologize for the less-than-esthetic photography while still in the shipping container, but discretion was the better part of valor with all the spines. See my other offerings for a Walliserops prepared with the pleural and pygidial spines also prepared freestanding for an even more dramatic specimen.

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