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Tetragraptus

TETRAGRAPTUS This graptolite had four stipes of variable form - they may have been reclined, or outstreached horizontally. Some species had a weblike structure connecting the four stipes. The thecae are usually of simple tubular form and may be inclined at high or low angles. Stipes vary in width from 1/25 to 2/5 inch (1 to 10 mm)
Habitat: Tetragraptus floated widely in Early Ordovician seas.
© 1992 Cyril Walker, David Ward .