Stromboidea

• Aporrhaidae
  • Anchura
    • Anchura sucrensis von der Osten, 1957

Original Description of Anchura sucrensis by von der Osten, 1957, p. 589:

• "Shell of medium size, fusiform, whorls convex, sutures incised; spire three or four whorls; sculpture of strong radial ribs, concave towards aperture, center thickened almost into nodes, about eight to the whorl, crossed by approximately 25 fine spiral threads; growth-lines forming fine radial threads, slightly weaker than spiral sculpture; body whorl at least twice height of last spiral whorl (lower part absent in holotype); posterior portion of outer lip thickened, extending outwards and upwards, forming undulating wing-like process (broken in holotype), reaching as high as top of last spiral whorl, with strong fold in line with nodes on ribs; aperture long, incomplete in holotype; spiral angle 50°"

Locus typicus: MMH locality Su 92, islands to the north of the Bahía de Santa Fé, eastern Venezuela

Stratum typicum: Taguarumo member, Barranquin Formation, Aptian

Types: "Holotype. - An incomplete shell, collected from the Taguarumo member of the Barranquin formation, at MMH locality Su 92."

Dimensions: - Height of broken shell 21 mm., diameter 10 mm., probable original height 27 mm.

Discussion. - "This species is similar to other Cretaceous Anchuras from Kansas and Texas but differs in having fewer spiral ribs per whorl. Being less numerous, the ribs are stromger and have more pronounced nodes than in the North American species. It is closest to Anchura kiowana, from the Kiowa shale of Kansas, which has 24 radial ribs per whorl, as compared to eight in A. sucrensis"

Anchura sucrensis von der OSten, 1957, pl. 65, fig. 26

References

• Von Der Osten, E. (1957). A Fauna from the Lower Cretaceous Barranquín Formation of Venezuela. Journal of Paleontology, 31(3), 571-590.