Paradoxides n. : A genus of large trilobites characteristic of the primordial formations.

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Taxonomy
Paradoxides, spines, free encyclopedia, Paradoxides gracilis, trilobite, genus, Paradoxides davidis, Avalonian, search, Kingdom, Phylum, Suborder, Family, semicircular, cheeks, large eyes, trunk, segments.

Defination from the web:
Paradoxides gracilis. Paradoxides was a genus of relatively large trilobites found throughout the world during the Mid Cambrian period (540 million years ago) ... Paradoxides is a characteristic Middle Cambrian trilobite of the 'Atlantic' (Avalonian) fauna. ...