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Estonioceras

ESTONIOCERAS
The spiral shell of this nautiliod is loosely coiled, with a final whorl growing away from the preceding part of the shell. It has a broad, shallow umbilicus. Growth lines are present on the flanks of the shell. Most unusually for nautiloids, the siphuncle is near the outside of the whorl (ventral).
Habitat: This genus adapted to a swimming existance by having a loosely coiled shell. It lived in fairly deep water and probably used its tenticles to grasp food.
Remark: This is a well-preserved specimen of a rare species, preserved as an internal mold.

© 1992 Cyril Walker, David Ward .