It has been classified under various genera by different authors, reflecting the constantly shifting opinions when it comes to heteromorph ammonites.
12.
""'Didymoceras stevensoni " "'was an extinct species of heteromorph ammonites from the upper Campanian age.
13.
"' Nostoceratidae "'is a diverse family of heteromorph ammonites found throughout the oceans of the world during the Late Cretaceous.
14.
""'Ancyloceras matheronianum " "'is an extinct species of heteromorph ammonite cephalopod belonging to the family Ancyloceratidae.
15.
Bob Henderson wrote in " Australian Geologist " : " Wolfgang Grulke's book " HETEROMORPH " is both noteworthy and exceptional.
16.
These irregularly-coiled ammonites are called "'heteromorph ammonites "', in contrast to regularly coiled ammonites, which are called homomorph ammonites.
17.
Perhaps the most extreme and bizarre-looking example of a heteromorph is " Nipponites ", which appears to be a tangle of irregular whorls lacking any obvious symmetric coiling.
18.
"Polyptychoceras " is a heteromorph ammonite, meaning that its shell does not curl up into the tight spiral shape which shells of ammonites from the subclass Ammonoidea typically do.
19.
""'Didymoceras nebrascense " "'was an extinct species of heteromorph ammonite from the upper Campanian age ( around 83 to 70 million years ago ).
20.
His private fossil collection is the envy of many museums and includes some of the finest specimens of "'heteromorph ammonites "'to be found anywhere in the world.
