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Species / Tibia Wenki

Tibia Wenki

Stromboidea


Original Description of Tibia wenki after Cox, 1948:

  • "Shell of medium size, fusiform, with a tall, subulate, polygyrate spire and a long, narrow, almost parallel-sided anterior rostrum. Whorls probably about 18-20, including the protoconch (broken away in the available specimens), strongly and evenly convex; the last, occupying slightly less than one-half of the total height, strongly convex at the periphery and well excavated at the origin of the rostrum. Aperture lozenge-shaped, with a short, curved, dorsally pointing posterior canal and a long, narrow anterior canal forming the rostrum. Outer lip thickened externally and provided with six digitations of which the top three and the bottom one are sharp and prominent; below the bottom digitation a deep sinus marks the origin of the rostru. Parietal callus thick and well detached from parietal wall, the margin of the inner lip becoming obscure and fading away anteriorly so as to be altogether indistinguishable on the rostrum. Early spire whorls with a reticulate ornamentation formed by the cancellation of close-spaced axial riblets by about 8 spirals. The axial riblets then fade away, so that the last four whorls bear only prominent, rounded, smooth spiral bands which are seperated by interspaces of about the same width, in which close-spaced, linear axial grooves are faintly visible. On the penultimate whorl the number of spiral bands has increased to 10 or 11, and on the last whorl the spiral ornament continues below the periphery as far as the origin of the rostrum, which is itself smooth. On the last whorl, particularly below the periphery, a spiral thread may occupy the middle of each interspace. The outer lip is smooth internally."

Locus typicus: Dent Peninsula, Sungei Togopi, Northern Borneo, Malaysia

Stratum typicum: Togopi Formation, Pliocene

Measurement of the Holotype: Original height 100-110 mm, diameter 28,5 mm

Tibia wenki Cox, 1948; Holotype; upper Miocene or Pliocene; Dent Peninsula, Sungei Togopi, Northern Borneo, Indonesia; Coll. Naturhistorisches Museum Basel no. H14406; Photo Virgilio Liverani

Comments:

  • Cox, 1948 compares it with Tibia powisii, which Tesch has figured from Timor

Etymology: named after E. Wenk, field geologist, who collected fossils in the Togopi formation of the Dent Peninsula

References:


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