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Species / Dimorphosoma Ancylochila


Original Description of Dimorphosoma ancylochila by Gardner, 1875, p. 397:

  • "Shell elongated; whorls 6 or 7, very angulated, their median keel tuberculated, sutural keel plain, intervals smooth, without spiral striae. The last whorl possesses two angular keels; the posterior considerably predominating, and the anterior being the sutural keel of the spire; the greater keel is continued into the wing. The wing is narrow, simple, thick and angular like a roof-ridge; for some distance it is at right angles to the axis of the spire, and then curves gradually upwards, slightly expanding at the point of curvature."

Locus typicus: "Found in the Crackers rocks at Atherfield", Isle of Wight, Isle of Wight County, South East Region, England

Stratum typicum: Cracker rocks, "Neocomian", lower Cretaceous

Types: Jermyn Street Museum

Dimorphosoma ancylochila Gardner, 1875, pl. XII, fig. 2, 2a

History and Synonymy


Casey, 1961 reports Dimorphosoma ancylochila from the Deshaysites forbesi zone of the lower Aptian


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