Tetragraptus definitions

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Tetragraptus

Tetragraptus logo #21000 Tetragraptus is an extinct genus of graptolite from the Ordovician. ...
Found on http://en.wikipedia.org/wiki/Tetragraptus

Tetragraptus

Tetragraptus logo #21003genus of extinct graptolites (colonial animals related to the chordates) that occur as fossils in marine rocks of the Early Ordovician Epoch (505 to ...
Found on http://www.britannica.com/eb/a-z/t/30
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