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Species / Helicaulax Tricosa

Helicaulax Tricosa

Stromboidea


Original Diagnosis of Anchura (Helicaulax) tricosa by Saul & Popenoe, 1993, p. 356:

  • "A large-sized Helicaulax with a long, posterior prong that is at an angle to the shell axis and a falcate outer lip broadened both anteriorly and posteriorly by angulate flanges."

Original Description of Anchura (Helicaulax) tricosa by Saul & Popenoe, 1993, p. 356:

  • "Shell large, high spired, drawn out anteriorly into a long, straight anterior rostrum; whorls about nine in number, wider than high, barely convex; suture impressed; body whorl angulate; anterior rostrum longer than the last whorl, slender, straight; early whorls with arcuate axial ribs; penultimate whorl ornamented by about 16 axial ribs crossed by straplike spiral ribs, about five on the spire and eight or nine on the body whorl; ribs forming nodes at intersections; first three abapical ribs separated by slightly wider interspaces, fourth and fifth closer together, forming the angulation of the body whorl that extends onto the outer lip digitation. Aperture subtriangular, deeply broadly sinused between posterior spur and falcate digitation; outer lip with two extensions, a relatively long, straight, spurlike posterior process basally adjacent to the spire and a long, and falcate digitation flanged both posteriorly and anteriorly along its lateral extension; posterior prong at an angle of 20- 30 to the shell axis."

Locus typicus: USGS loc. 2759, lower Ladd Canyon, near Silverado Canyon, Santa Ana Mts., Orange Co., California, USA

Stratum typicum: Ladd Formation, upper Baker Canyon Sandstone and lower Holz Shale members, Turonian, Cretaceous; uncommon, Santa Ana Mts., Orange Co., California, USA

Types: "Holotype: USNM cat. no. 465514. Paratypes: LACMIP cat. nos. 11541 from UCLA loc. 4235, Holz Ranch, and 11542 from LACMIP loc. 15295, Silverado Canyon, Santa Ana Mts., Orange Co., California; UCR cat. nos. 7787/101, from UCR loc. 7787, Silverado Canyon, and 7788/20, from UCR loc. 7788, Silverado Canyon, Santa Ana Mts., Orange Co., California; USNM cat. nos. 465517-465518 from USGS loc. 2757, Silverado Canyon; USNM cat. nos. 465515-465516 from USGS loc. 2759, Ladd Canyon, Santa Ana Mts., Orange Co., California; Stadum specimen."


References

  • Saul, L.R. & W.P. Popenoe, 1993. Additions to Pacific Slope Turonian Gastropoda. The Veliger 36:351-388, Fulltext

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