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Spirifer

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Spi´ri`fer
n.1.(Paleon.) Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side.
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106): Spirifer tscheffkini Verneuil (1845), Porambonites dentatus Pander (1830), Porambonites costatus Pander (1830), and Spirifer terebratuliformis M'Coy (1846).
Platystrophia (Orthida) and new related Ordovician and early Silurian ... by Zuykov, Michael A.; Harper, David A.T. / Estonian Journal of Earth Sciences
A number of the Athyris specimens were compressed dorso-ventrally, the Spirifer specimens were fragmentary, and the rynchonellids were compressed and appeared to be rolled into a ball.
A case study in paleoecology from the Mississippian of Missouri, with ... by Brandenburg, J.P. / Transactions of the Missouri Academy of Science
 
 
 
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