Temporal range: Frasnian
The 15 cm (6 in) long creature had tough plating on the front of its body. Like other arthrodires such as Coccosteus and the giant Dunkleosteus it had sharp, bony plates in its mouth which formed a turtle-like beak for cutting prey to pieces. Rolfosteus's most unusual feature was its highly elongated snout, which may have been used to enhance its sense of smell, as well as increase its hydrodynamic streamlining.
Long, John A. The Rise of Fishes: 500 Million Years of Evolution Baltimore: The Johns Hopkins University Press, 1996. ISBN 0-8018-5438-5
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