""'Didymoceras navarroensis " "'is an extinct heteromorph ammonite species from the upper Campanian to lower Maastrichtian ( 83.5 to 66 million years ago ).
22.
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.
23.
""'Anaklinoceras " "'is a genus of extinct heteromorph ammonite cephalopod that lived in marine environments in what is now Western North America during the Campanian division of the Cretaceous period.
24.
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 " ).
25.
Kennedy " et al . " ( 2000 ) placed it under the genus " Didymoceras ", which in turn is classified under the family Nostoceratidae under the diverse suborder of heteromorph ammonites, Ancyloceratina.
26.
""'Ancyloceras " "'is an extinct genus of heteromorph ammonite cephalopod found throughout the world during the Lower Cretaceous, from the Lower Barremian epoch until the genus extinction during the Lower Aptian.
27.
"Annuloceras " is a heteromorph ammonite similar in form to other heteroceratids except that the early helix is more loosely wound . " Macroscaphites " differs in that the early portion is planispiral and tightly wound.
28.
"' Acrioceratidae "'is a family of heteromorph ammonites included in the Ancyloceratoidea comprising ancyloceratid-like forms that start off with a coiled juvenile section, followed by a straight or curved shaft ending in a hook.
29.
"Exiteloceras " was proposed by Alpheus Hyatt in 1894 for heteromorph ammonites with shells that are loosely coiled in a plane, early whorls varying from straight limbs connected by semicircular elbows to elliptical or nearly circular loops, later whorls being elliptical to circular.
30.
""'Heteroceras " "'is a Lower Cretaceous heteromorph ammonite belonging to the ancyloceratacian family, Heteroceratidae, characterized by a helically coiled juvenile shell at the apex followed by slightly curved adult shaft, with a J-shaped section at the end of it.
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