“Paleocoma is an extinct genus of brittle star that lived in the Jurassic. Its fossils have been...Paleocoma
“Fossils of Spriggina are known from the Ediacaran period, around 550 million years ago. The...Spriggina
“Opabinia regalis is an extinct stem-arthropod found in the Middle Cambrian Burgess Shale...Opabinia
“Hemicidaris is an extinct genus of echinoid that lived from the Middle Jurassic to the Early...Hemicidaris
“Uintacrinus ("crinoid from the Uinta Mountains") is an extinct genus of crinoid from the...Uintacrinus
This category has the following 2 subcategories, out of 2 total.