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Species / Tibiaporrhais Japonica

Original description of Rostellaria japonica by Nagao, 1932:

  • "Shell turreted, consisting of numerous whorls; spire very high with an apical angle of about 20°; eaeh spire-whorl rather high, flatly convex in the lower half and slightly flattened or concave in the upper with a distinct suture above; surface ornamented with numerous crowded, narrow and subequal spiral striae, alternating with interspaces; interspaces between the spiral striae flat, usually narrower than the striae themselves, and narrower and more crowded in the lower half of the whorl; lines of growth fine and sinuous, running a little backward for some distance from the upper suture and convex forwardly on the shoulder. Body whorl rather short with convex sides and a round periphery; aperture moderately expanded; outer lip thin, bearing two processes of unknown length which originate from low, relatively indistinct carinae on the body whorl; inner lip smooth, sinous, with a callosity; anterior canal very imperfectly preserved; base weakly convex, contracting below, and ornamented with numerous narrow spiral ribs and broader grooves in alternation."

Stratum typicum: Upper Ammonite Bed, upper Cretaceous


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