Search Results for: Echinoderms unworked
± moscovian ± bashkirian ± * mississippian serpukhovian large primitive trees , first land vertebrates , and amphibious sea-scorpions live amid coal -forming coastal swamps . lobe-finned rhizodonts are dominant big fresh-water predators. in the oceans, early sharks are common and quite diverse; echinoderms
telychian ± * aeronian ± * rhuddanian ± * ordovician late hirnantian invertebrates diversify into many new types (e.g., long straight-shelled cephalopods ). early corals , articulate brachiopods (orthida, strophomenida, etc.), bivalves , nautiloids , trilobites , ostracods , bryozoa , many types of echinoderms...
https://en.wikipedia.org/wiki/Geologic_time_scale