Though Laurussia was essentially tropical or subtropical, its climatic zones changed somewhat through the course of the Devonian as this landmass migrated northward during Late Devonian and Early Carboniferous times. Mucrospirifer prolificus,three specimens photographed from different views showing aspects of shell structure: Paraspirifer bownockeriis more compact, but deeply grooved on one valve, with a corresponding ridge on the other. While the diversification of fishes is exciting, the Devonian vascular plant explosion is even more spectacular. Most of these plants had true roots and leaves, and many were quite tall. The Devonian period - at times simply referred to as Devonian, was a geological period which is believed to have existed somewhere between 416 to 359.2 million years ago (Mya). Microbial reefs dominated under the warmer conditions of the early and late Devonian, while coral-stromatoporoid reefs dominated during the cooler middle Devonian. The conditions favored the production of some of the largest reef complexes in the world in the equatorial seas. Devonian extinctions, a series of several global extinction events primarily affecting the marine communities of the Devonian Period (419.2 million to 359 million years ago). Fish (ToL: Vertebrata Ruger P94 9mm Drum Magazine,
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