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Species / Anchura Convexa


Original Description of Anchura convexa by Wade, 1926, p. 149:

  • "Shell fairly large and strong; spire turreted and acute; whorls more than eight, convex, increasing gradually in size; apex broken away; protoconch unknown; sculpture nodulate, consisting of both spiral and axial elements, axial ribs low and protractive, very numerous and close on the early whorls but becoming wider and less distinct upon the body; spiral elevations low, obscured by the axials on the spire but more distinct on the body, spiral elevations five on the penultima and ten on the ultima; spiral interspaces marked by fine secondary lirae; low tubercles or nodules formed at the intersections of the spirals and axials; on the expanded outer lip the third spiral elevation in front of the suture persists as an elevation, but the adjacent three spiral ridges break up into a number of secondary lirae, which spread out in fan shape over the expanded outer lip; suture impressed; body convex and well rounded; that part of the body minus the apertural features is almost spherical in outline, body produced in front into a short, narrow, and pointed anterior canal; aperture brilliantly glazed with callus; inner aperture lenticular, produced in front into a narrow open canal, extended posteriorly into a shallow heavily calloused notch to the posterior suture of the penultima; outer lip widely expanded and thickened internally, its outer margin slightly lobed in front and produced backward into an acutely angular extension, posterior margin of outer lip sinuous and marked by one or two obscure tubercles, the posterior extension of the outer lip adnate to the spire and extending as far back as the antepenultima; inner lip arcuate, strongly constricted at the base of the body, heavily calloused; columella smooth; parietal wash heavy, its margin sharply defined and extending to the posterior commissure. An imperfect individual measures in altitude 32.5 millimeters; maximum diameter, dorso-ventrally, 15 millimeters; extension of outer lip, 14.1 millimeters."
  • "This species is well characterized by its short, stocky outline, convex whorls, and further by the thick parietal callus. Anchura abrupta Conrad is a closely related species from Owl Creek, Miss. Occurrence: Ripley formation, Dave Weeks place on Coon Creek, McNairy County, Tennessee; Collection: US National Museum."

Locus typicus: Coon Creek, McNairy County, Tennessee, USA

Stratum typicum: Ripley Formation, Maastrichtian, upper Cretaceous

Anchura convexa Wade, 1926, pl. LII, fig. 8, 9

History and Synonymy


Anchura convexa holotype in Sohl, 1960, pl. 13, fig. 15, 16

Specimens from institutional collections

Anchura convexa Wade, 1926; Ripley Formation, Maastrichtian, upper Cretaceous; Coon Creek, McNairy County, Tennessee, USA; Coll. Stichting Schepsel Schelp no. SSS 27030


  • Bandel, K. & Dockery III, D.T. (2016). Mollusca of the Coon Creek Formation in Tennessee and Mississippi with a Systematic Discussion of the Gastropoda; Bull. Alabama Mus. Nat. Hist. 33:34-96.
  • Sohl, 1960
  • Wade, 1926

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