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Unformatted text preview: foraminiferans went completely extinct, as did the trilobites. Brachiopod genera declined from 60 to 10. The majority of extinctions seem to have occurred at low paleolatitudes, possibly suggesting some event involving the ocean. . Plants seem to have missed the great extinction. What floral changes occurred during the Permian occurred earlier in the period, when the gradual drying out of the continent led to the evolution and spread of better adapted "dry forms" such as gymnosperms and seed ferns to replace the swamp trees of the Carboniferous such as arborescent lycopods and sphenopsids. One major plant group disappeared, the swamp gymnosperm Cordaites . Table 1. Victims of the Permian extinction. fusulinid foraminifera trilobites rugose and tabulate corals blastoids acanthodians placoderms pelycosaurs...
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- Fall '10
- Biology, Extinction event, Carboniferous, Permian, permian extinction, great Permian extinction