Bradoriids (Arthropoda) and the Cambrian Diversification

Bradoriids (Arthropoda) and the Cambrian Diversification

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Bradoriids, among the earliest arthropods to appear in the full body batman silhouette fossil record, are extinct, ostracod-like bivalved forms that ranged from the early Cambrian to the Middle Ordovician.Bradoriids are notable for having appeared in the Cambrian fossil record before the earliest trilobites, and considering their rapid ascent to high genus-level diversity, provide key data for our understanding of the evolutionary dynamics of the Cambrian Explosion.This asi178mc paper presents a broad review of bradoriid paleobiology.

It is hypothesized here that an allele of Antennapedia determines whether bradoriid shields are preplete, amplete, or postplete.The preplete configuration of the shields of Cambroarchilocus tigris gen.nov.

sp.nov.suggests that shield rowing motion may have propelled the animal backwards.

Arcuate scars attributed here to a microdurophagous predator (Arcuoichnus pierci nov.ichnogen.nov.

ichnosp.) occur on the paratype of Cambroarchilocus tigris gen.nov.

sp.nov.