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Species / Anchura Hopii


Original Description of Anchura hopii by Kirkland, 1996, p. 65:

  • "Medium sized (to 4.5 cm high, 1.5 cm wide minus expanded lip, 2.5 cm wide including expanded outer lip); suture incised; apical angle of about 30; 8-10 rounded whorls; aperture lenticular, inner lip with extensive callous, outer lip thickened and curving upward into a point, separated from main body of shell by anterior and posterior notch, long siphonal canal; spire ornamented by axial ribs and fine spiral costae; on body whorl, shape becomes angular, with axial ribs rising into nodes on crossing widest part of shell, from which spiral rib extends onto expanded outer lip."

Locus typicus: Black Mesa, Apache-Navajo Counties, Arizona, USA

Stratum typicum: At Black Mesa, abundant in the Blue Point Sandstone Tongue and present in the lower sandstone member ot the Toreva Formation at Blue Point, middle Turonian Collignoniceras woollgari regulare subzone of the Collignoniceras woollgari Zone, upper Cretaceous.

Types: Holotype MNA N3476; paratypes MNA N3468, N5355, N5533, N5534 from MNA loc. #150, main body of Blue Point Sandstone Tongue, Toreva Formation

Anchura hopii Kirkland, 1996, pl. 41, fig:P, Q, R, S, T, copyright New Mexico Museum of Natural History and Science


  • Kirkland, J. I. (1996). Paleontology of the Greenhorn cyclothem (Cretaceous: late Cenomanian to middle Turonian) at Black Mesa, northeastern Arizona. New Mexico Museum of Natural History and Science. Bulletin 9, 1-131, pls. 1-50.Fulltext

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