Hederellids are extinct colonial animals with calcitic tubular branching exoskeletons. They range from the Silurian to the Permian and were most common in the Devonian period. They are more properly known as `hederelloids` because they were originally defined as a suborder by Bassler (1939), who described about 130 species. Although they have tr.....
Found on http://en.wikipedia.org/wiki/Hederellid
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