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Species / Drepanocheilus Kiowanus


Original Description of Anchura kiowana by Cragin, 1895 cited by Reeside, 1922:

  • "Shell small, consisting of six convex whorls; spire elevated; suture impressed; wing of moderate size, consisting of a proximal flangelike part, continued posteriorly across half or more of the first spire whorl, and a carinated falciform process; carina gradually arising at the base of the falciform process and traversing the latter to the extremity; falciform process much shorter and less upturned distally than that of the somewhat similar species A. ruida White, not rising to the lowest level of the suture between the body whorl and the first spire whorl but having its point directed outward and somewhat upward so as to make a large angle with the axis of the spire, extero-inferior outline of wing rounded and the border between this and the canal sinuous, margin of upper (flange) part of wing describing a slightly concave to sigmoid outline and more or less thickened and reflexed; inner lip provided with a moderately broad and prominent callous; canal short and obliquely truncated; spire whorls and posterior half to two-thirds of body whorl ornamented with narrow curved, subvertical ribs or folds, of which there are about 24 on the first spire whorl, and with numerous revolving striae, the latter ornamentation gradually becoming prominent and superseding the ribs on the lowest third to half of the body whorl."

Measurements: Height: 19 mm, breadth of body whorl including wing: 15 mm.

History and synonymy


Anchura kiowana in Twenhofel, 1924, pl. 9, figs. 2, 3


Stanton, 1947:

  • Anchura (Drepanochilus) kiowana Cragin in Stanton, 1947, p. 102, pl. 65, figs. 6-10
  • Anchura (Drepanochilus) kiowana Cragin var marquettensis Stanton, 1947, p. 103, pl. 65, figs. 5, 11


Scott, 1970, p. 81:

  • "Discussion-This species as described by CRAGIN (1894b), STAINBROOK (1940), and STANTON (1947) belongs in the genus Drepanochilus, which differs from Anchura by having a short canal and spiral striae on body whorl (Sohl, 1960, p. 99). Drepanochilus ranges from Lower Cretaceous to Eocene; and Anchura s.s. is generally restricted to the Upper Cretaceous. The validity of the var. marquettensis is questionable and should be tested by statistical analyses. Ten incomplete specimens collected at Brookville (unit 3, Loc. S9) do not seem to differ greatly from specimens elsewhere. The single specimen discussed below from southwest of Marquette (unit 15, Loc. M4) is a different species. The significance of differences in spiral striae on the body whorl is difficult to assess with the limited material in hand.!
  • TYPES.-Syntypes: USNM 32673; figured plesiotypes: USNM 77562, 77563a-b; syntypes of var. marquettensis: USNM 77654a-b; representative specimens: KU 500352a-c, 500353a-b, 500354, 500355, 500356a-b, 500357.


  • Cragin, F. W 1894. Descriptions of invertebrate fossils from the Comanche Series in Texas, Kansas and Indian Territory: Colorado College Studies, v. 5, p. 49-68.
  • Scott,R.W., 1970. Paleoecology and Paleontology of the Lower Cretaceous Kiowa Formation, Kansas, Article 52 (Cretaceous 1); The University of Kansas Paleontological Contributions, The University of Kansas Publications, Lawrence, 1-94, pls. 1-7
  • W.H. Twenhofel, 1924. The Geology and Invertebrate Paleontology of the Comanchean and "Dakota" Formations of Kansas; Kansas Geological Survey Bulletin 9: 1-135, pls. 1-23.

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