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Although the Early Palaeozoic cephalopod order Endocerida is generally regarded as monophyletic, alternative views have been expressed. These invoke origins from different lineages within the order Ellesmerocerida. To test these alternatives, various aspects of endocerid morphology (including conch shape, structure of the ectosiphuncle, form of the endosiphuncular deposits, nature of the apical portion...
Orthoconic cephalopods from the Ordovician Katkoyeh Formation at Banestan, Kerman Province, Iran, comprise a single species named as Sactorthoceras banestanensis Evans nov. sp. Associated faunas suggest close palaeobiogeographical linkage with other regions of north peri-Gondwana, notably Morocco and Bohemia (Perunica), while Sactorthoceras itself is also indicative of relationships with Baltica and...
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