by diversification within the established body plans, a pattern similar to that observed in other evolutionary events.

Fauna

The Avalon explosion was a time of early evolution and low diversity in species. There were over 270 species defined, with 50 different morphological characteristics categories, many of whose anatomical structures had to be inferred with fossils and casts. These species were placed into 20 different genera.

During this time, animals became bilateral and increasingly

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