heteromorph वाक्य
उदाहरण वाक्य
मोबाइल
- ""'Didymoceras navarroensis " "'is an extinct heteromorph ammonite species from the upper Campanian to lower Maastrichtian ( 83.5 to 66 million years ago ).
- 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.
- ""'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.
- 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 " ).
- 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.
- ""'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.
- "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.
- "' 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.
- "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.
- ""'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.
- According to Prof . Chris Wilson, this work was significant in that Grulke shows that the modern view of heteromorph ammonites no longer regards them as rare oddities . " He describes how these eccentric and bizarre members of the ammonites arose three times during the reign of the order and that at a point during the mid-Cretaceous they represented almost half of all ammonite species in existence at that time ."
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