p-zone
p-zone A biostratigraphic zone distinguished by pelagic fossils, e.g. ammonites (Ammonoidea) and graptolites (Graptolithina). The term was proposed in 1965 by T. G. Miller. Compare B-ZONE.
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radial symmetry
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hepa… bradytely , bradytely An exceedingly slow rate of evolution, manifest by slowly evolving lineages which survive much longer than would normally be expected. Livi…
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p-zone