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MONOGAPTUS

MONOGAPTUS Graptolites of this genus had a single stipe and a highly variable form; they could be completely straight, gently curved, or completely spiral. The form of the Thecae is vital to identification. In this genus there was a tendency for thecae to become isolated from one another. Some evolved very rapidly, so species of this genus are easily recognizable and stratigraphically useful. Habitat: It floated in open seas. © 1992 Cyril Walker, David Ward .