meraspid
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Trilobite — ] Highly complex compound eyes are another obvious feature of the cephalon (see below). Figure 3 shows gross morphology of the cephalon. The cheeks (genae) are the pleural lobes on each side of the axial feature, the glabella. When trilobites… … Wikipedia
Parvancorina — Taxobox fossil range = Ediacaran mdash; around 555 Ma regnum = incertae sedis phylum = incertae sedis : Arthropoda? genus = Parvancorina genus authority = Glaessner 1958 type species = Parvancorina minchami type species authority = Glaessner 1958 … Wikipedia
Agnostida — Agnostida Rango fósil: Cámbrico Inferior Ordovícico Superior … Wikipedia Español
