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2019: "The nileid trilobite Symphysurus from upper Tremadocian strata of the Moroccan Anti-Atlas: taxonomic reappraisal and palaeoenvironmental implications" Fossils and Strata
It preserves its very well developed lateral serrations
which were agile and seasoned hunters
has small glued fracture
20379 - Nice Pink Erythrite Crystals on Matrix - Bou Azzer Mine (South Morocco) Crinoids 2019: "The nileid trilobite SymphysurusErythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula (Co3(AsO4)28H2O). Erythrite and annabergite (Ni3(AsO4)28H2O) (nickel arsenate) form a complete series with the general formula (Co,Ni)3(AsO4)28H2O. Erythrite crystallizes in the monoclinic system and forms prismatic crystals. The color is crimson to pink and occurs as a secondary coating known as cobalt bloom on cobalt arsenide minerals. Well formed crystals are