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Didymograptus

DIDYMOGRAPTUS
These graptolites formed a shape similar to a tuning fork. The colonies were often robust, ranging in size from 3/8 to 4 in (1 cm to 10 cm). The thecae are long with simple tubes. The stipes expand in width from the proximal end.
Habitat: This genus floated in northern oceans.
© 1992 Cyril Walker, David Ward .

Extinct