Didymoceras nebrascense
Extinct species of ammonite / From Wikipedia, the free encyclopedia
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Didymoceras nebrascense was an extinct species of heteromorph ammonite from the upper Campanian age (around 83 to 70 million years ago). It was sexually dimorphic, with two adult sizes averaging at 270 mm (11 in) and 180 mm (7.1 in) high for females and males respectively. It exhibited three distinct growth stages. The first growth stage was composed of one or two straight sharply bending sections and a gently curved third. The second growth stage is composed of around three and a half loosely coiling whorls. The last (adult) growth stage is composed of a U-shaped bend facing upwards.
Quick Facts Scientific classification, Binomial name ...
Didymoceras nebrascense | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Ammonitida |
Suborder: | †Ancyloceratina |
Family: | †Nostoceratidae (?) |
Genus: | †Didymoceras |
Species: | †D. nebrascense |
Binomial name | |
†Didymoceras nebrascense (Meek and Hayden, 1856) | |
Synonyms[1] | |
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