In this genus, and in the closely related family Turrilitidae, the coiling of the shell has become helical (like that of a snail or gastropod), in contrast to the planispiral flat coiling of most ammonites. In Bostrychoceras, the coiling is loose, so that successive whorls are not in contact. The simple ornament of fine, closely spaced ribs is interrupted on the living chamber by the development of tubercles. The living chamber is U shaped, and the aperture was directed forward in life, so that the protruding tentacles would not have been in contact with the sea bed below. Paleontologists believe that this genus was probably planktonic, floating in the opean ocean, and feeding on small animals in the water column. FREE FedEx Ground Shipping within the 48 Continental United States! To all our Alaska, Canada and Hawaii customers: you will be notified of any applicable shipping charges prior to processing your order for approval. |
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| Overall Size: 4.25" H X 4" W on matrix |
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| Overall size: 5" H X 3.25" W |
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| Overall Size: 3.5" H X 3.5" W |
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