The Haploceratidae is one of the families to go to form the Haplocerataceae, a superfamily in the ammonitina; which according to Donovan et al (1981)can be derived from the Taramelliceratinae, a subfamily of the Oppeliidae. Haploceratids, (Haploceratidae) are typically small, smooth and somewhat featurelss ammonites, as described by Arkell et al, ...
Found on http://en.wikipedia.org/wiki/Haploceratidae
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