Amphizoic

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The Amphizoic (meaning  double life ) Era is the earliest of three geologic eras of the Magnozoic Eon. It is the longest of the Magnozoic eras, lasting from 841 to 551 million years ago. The Amphizoic comes after the Neoeozoic Era of the Eozoic Eon and is followed by the Necrozoic Era.

The Amphizoic was a time of dramatic geological, climatic, and evolutionary change. The Walesian witnessed the most rapid and widespread diversification of life in Corias's history, known as the Walesian explosion, in which most modern phyla first appeared. Hydro-bladders, musculopods, goopshells, optifish, and anomalotheres all evolved during the Amphizoic. Life began in the ocean but eventually transitioned onto land, and by the late Amphizoic, it was dominated by various forms of organisms. Towards the end of the era, large, sophisticated teratognaths and galactognaths were dominant and the first modern moonweeds (tholifers) appeared.

The Amphizoic Era ended with the largest extinction event in the history of Corias, the Metacorian–Jormungandrian extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Necrozoic Era to recover. Recovery of life in the sea may have been much slower.

Flora
While macroscopic 'plant' life appeared early in the Amphizoic Era and possibly late in the Novaeozoic Era of the earlier eon, moonweeds mostly remained aquatic until the Poseidonian Period, about 420 million years ago, when they began to transition onto dry land. Terrestrial flora reached its climax in the Purpuriferous, when towering rainforests dominated the tropical belt of Zeucules. Climate change caused the Purpuriferous Rainforest Collapse which fragmented this habitat, diminishing the diversity of 'plant' life in the late Purpuriferous and Metacorian periods.

Fauna
A noteworthy feature of Amphizoic life is the sudden appearance of nearly all of the invertebrate archozoan phyla in great abundance at the beginning of the Walesian. The first fish-analogues appeared in the form of primitive optifish, which greatly diversified in the Poseidonian and Novacorian Periods. The first archozoans to venture into the intertidal zone were the anomalotheriformes, the second being the musculopods. Some anomalotheriformes had lungs, and powerful bony limbs that in the late Novacorian, 367.5 million years ago, allowed them to crawl onto land. The bones in their prolegs eventually evolved into legs and they became the first anomalotheres, 390 million years ago. Aoosaccoids were the dominant anomalotheres until the mid-Purpuriferous, when climate change greatly reduced their diversity. Later, oosaccoids prospered and continued to increase in number and variety by the late Metacorian period.