Anadesmoceras
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Anadesmoceras is an hoplitid ammonite from the lower Albian (upper Lower Cretaceous) of England, included in the subfamily Cleoniceratinae. Anadesmoceras has a shell shaped more or less like a compressed Cleoniceras but with faint ornament only on the inner whorls. The shell has bundled growth striae. The aperture is preceded by several wide sinuous constrictions.
References
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Mesozoic Ammonoidea, Arkell et al; Treatise on Invertebrate Paleontology, Part L. p. L394.