Orthoceratoidea is a subclass, formerly considered an infraclass or a superorder (Wade 1988), that comprises Cephalopoda orders that have orthoconic to slightly cyrtoconic shells and central ...
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to subcentral siphuncles in which there may be internal deposits. Currently, Orthoceratoidea comprises the orders Dissidocerida, Ascocerida, Pseudorthocerida, Lituitida and Orthocerida. - Wikipedia (en), 16.07.2017