These irregularly-coiled ammonites are called "'heteromorph ammonites "', in contrast to regularly coiled ammonites, which are called homomorph ammonites.
2.
Different methods utizilized to estimate conformational equilibrium enthalpy include : the Westheimer method, the homomorph method, and more simply using estimated enthalpies of nonbonded interactions within a molecule.
3.
Most ammonites are homomorph, as they maintain the same shape throughout the growth, while the ammonites in this genus have uncoiled shells ( heteromorph or different-shaped ammonites ), that would have precluded fast swimming.
4.
Not all the Ancyloceratina had such strangely shaped shells; many of the earlier heteromorph forms had regularly coiled shells barely distinguishable from the homomorph ammonites ( for example, the Lower Cretaceous genus " Deshayesites " ).
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