Spiriferida is an order of extinct articulate brachiopod fossils which are known for their long hinge-line, which is often the widest part of the shell. In some genera (e.g. Mucrospirifer) it is greatly elongated, giving them a wing-like appearance. They often have a deep fold down the center of the shell. The feature that gives the spiriferids th...
Found on
http://en.wikipedia.org/wiki/Spiriferida
(from the article `lamp shells`) ...lophophore (of Recent genera) dorsally spiral and attached to crura (supporting structures); spondylia rare; nearly 300 genera; Ordovician to ...
Found on
http://www.britannica.com/eb/a-z/s/142
No exact match found.
