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- 866fbfc3-7395-4a77-bc1e-29272e8b795c definition "The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago (Mya), to the beginning of the Carboniferous, 358.9 Mya. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. Various terrestrial arthropods also became well-established. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating almost every known aquatic environment. The ancestors of all four-limbed vertebrates (tetrapods) began adapting to walking on land, as their strong pectoral and pelvic fins gradually evolved into legs. In the oceans, primitive sharks became more numerous than in the Silurian and Late Ordovician. The first ammonites, species of molluscs, appeared. Trilobites, the mollusc-like brachiopods and the great coral reefs, were still common. The Late Devonian extinction which started about 375 million years ago severely affected marine life, killing off all placodermi, and all trilobites, save for a few species of the order Proetida." @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c id "1648592" @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c path_id 0e098a6e-2123-4566-9069-6a3401775ca3 @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c path_id a9f88ca9-5d19-45fa-8fbb-3c6ff5f1f190 @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c path_id af145656-986a-4969-bb77-6e5b2cff1ede @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c path_label "Chronostratigraphic Units" @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c path_label "PALEOZOIC" @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c path_label "PHANEROZOIC" @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c prefLabel "DEVONIAN" @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c reference "International Commission on Stratigraphy (http://www.stratigraphy.org/)" @default.
- 866fbfc3-7395-4a77-bc1e-29272e8b795c tag "Chronostratigraphic Units" @default.