Traits name details
original description
Foord, A. H. (1887). On “Orthoceras [Endoceras] duplex,” Wahlenberg et auctt., with descriptions of three new species of<i> Endoceras </i>from the Ordovician of Sweden and Russia contained in the British Museum (Natural History). <em>Annals and Magazine of Natural History.</em> 20(120): 393-402., available online at https://www.biodiversitylibrary.org/page/30032553 page(s): 401 [details]
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