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closely related gomphothere genus
is the largest and best-known genus of an extinct Permian order of seed ferns
About 260 million years ago
other scientists took issue with the study's methods
Pentacrinus subangularis, crinoids Styracosaurus closely related gomphothere genusCrinoids are assigned to the phylum Echinodermata, a group of radially symmetrical marine animals, such as the starfish, sea urchins, and brittle stars. Crinoids are commonly referred to as "sea lilies". These flower like marine invertebrate animals are beautifully colored and live as solitary individuals. This species is characterized by a globular body enclosed by a small calyx, from which freely moving arms extended upward to gather food. At the
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