Clydonautiloidea
superfamily of molluscs
The Clydonautiloidea are a superfamily within the nautiloid order Nautilida characterized by smooth, generally globular, shells with nearly straight sutures, in early forms, but developing highly differentiated sutures in some later forms. Where known, the siphuncle tends to be central to subcentral.
The Clydonautiloidea, name based on Hyatt's Clydonautilidae of 1900, are more or less the Liroceratina of Shimansky 1962.
Classification and taxonomy
The Clydonautiloidea, which began in the Late Devonian, combine five families, three of which are restricted to the Triassic. Principal and forming the root stock are the Late Devonian to Upper Triassic Liroceratidae, from which Shimankiy derived his suborder. Derived from the Liroceratidae in the Early Mississippian are this Mississippian to mid Permian Ephippioceratidae. The three Triassic families, derived from Triassic liroceratids, are the Clydonautilidae, Gonionautilidae, and Siberonautilidae, all with prominent lobes and saddles in the suture.
The families are described as:
The Clydonautilidae, named by Hyatt in 1900, were the first to be defined and provide the name for the superfamily. Clydonautilids are characterized by generally smooth, involute, globular to compressed shells with a very small to occluded (hidden) umbilicus and sutures with prominent lobes and saddles. Their range is from the mid to Upper Triassic.
“Clydonautiloidea” enters the record as superfamily of molluscs. Crown Archives preserves that source wording while asking what Clydonautiloidea, superfamily and molluscs can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated May 20, 2025. The linked authority identifier is Q33187939. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1900 and 1962.
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This entry incorporates text from “Clydonautiloidea” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.