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Species / Drepanocheilus Quadriliratus


Original description of Anchura (Drepanochilus) quadrilirata by Wade, 1926:

  • "Shell of medium size and very fragile; spire acute, its elevation about half the total altitude of the shell; whorls more than six, convex, increasing in size gradually; apex broken away; protoconch unknown; sculpture strongly axial on the of the whorls of the spire and on the posterior half of the body but spiral on the anterior half of the body; axials abruptly elevated and angular along the crest, not as broad as the concave interspaces, which become much wider on the lateral whorls, axial ribs 18 on the type, slightly varicose at irregular intervals, about one or two to each whorl; spiral sculpture of four strong ridges on the base of the body; the most, posterior of these ridges occurs along the medial line of the body and extends out as a carina of the acutely expanded outer lip; on the whorls of the spire and along the base of the body and the anterior canal there are numerous microscopic spiral threads, which override the axial ribs; suture impressed; body convex, well rounded in front and merging into a short anterior canal; aperture broad; outer lip expanded into a narrow acuminate projection bent a little backward from the medial horizontal toward the body; the outer lip widens rapidly, extending to the anterior extremity of the anterior canal in front and to the posterior suture of the penultima behind; inner lip excavated medially; columella smooth; parietal wash thin and wide, its outer limit marked by a sharp line."

Locus typicus: Dave Weeks place on Coon Creek, McNairy County, Tennessee, USA.

Stratum typicum: Ripley Formation, upper Cretaceous

Drepanochilus quadrilirata in Sohl, 1960, pl. 11, fig. 22

  • image courtesy of the U.S. Geological Survey


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