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Species / Anchura Lamari

Anchura Lamari


Original description of Anchura lamari by Stephenson, 1941:

  • “Shell rather large, turreted, apical angle about 22 degrees. Protoconch not preserved. Suture closely appressed, moderately impressed. Whorls 10 in the holotype, slightly convex on the anterior half of each whorl, flattening out posteriorly toward the suture. The axials are thick and moderately prominent on the most inflated part of the whorl, but become weaker both toward the front and rear; they number 22 on the body whorl and 19 on the penultimate whorl; the trend of the axials is a little concave toward the aperture, the deepest part of the curve being about midway of the width of the whorl. On the antepenultimate whorl are 6 spirals, but on the penultimate whorl the posterior margin of the body whorl has overriden the sixth spiral, leaving only 5 exposed; the spirals are of subequal strength, but tend to be a little stronger and a little more closely crowded on the most inflated part of each whorl. The intersecting of the axials and spirals produces a distinct, rather coarse noding, but the first spiral below the suture is more finely noded than the others. The base exhibits 7 nearly smooth spirals; the second spiral below the periphery is the strongest of the seven, in front of which the spirals become successively narrower and weaker toward the columella, the last one being very faint. Numerous fine spiral threads are present over the entire outer surface of the shell. The aperture is broken away on the holotype, and the thinness of the inner lip suggests that this shell has not reached maturity; one specimen from the type locality, though no larger than the holotype, possesses a thick inner lip, notched centrally, and the posterior portion of an expanding, thick outer lip which is mostly broken away. Two incompletely preserved specimens from near Chatfield show a greatly extended expanding, broad, thick outer lip similar to that of A. abrupta Conrad; the fourth spiral in front of the suture of the body whorl continues out onto this lip, curving upward toward the base of the long, upward, spinose projection which, though broken away in the available material, doubtless would be present in perfect shells, as it is in A. abrupta; at the outer lower extremity of the lip is a short, blunt downward projection; two or three of the spirals in front of the fourth one die out as they pass forward onto the lip, but the surface of the lip is further ornamented with obscure, fine threads. The anterior canal lacks these threads.”

Locus typicus: Kaufman, Kaufman County, Texas, USA

Stratum typicum: Nacatoch Sand, Navarro Group, Maastrichtian, upper Cretaceous

Type specimens: Holotype (incomplete): USNM no. 76904, height 68+ mm, diameter 27.5 mm; paratypes, 5 incomplete specimen USNM no. 20986

Etymology: Named after Mirabeau B. Lamar, President of the Republic of Texas, 1838-1840.

Anchura lamari in Stephenson, 1941

  • holotype
  • Image courtesy The University of Texas at Austin

Original comment of Sohl, 1960

  • possibly a synonym of Anchura substriata

References:


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