Neogastropoda Thiele, 1929
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publication ID |
https://doi.org/ 10.4202/app.2009.0042 |
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persistent identifier |
https://treatment.plazi.org/id/03FBF625-FFC1-212D-7EBD-96F8FE1027C7 |
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treatment provided by |
Felipe |
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scientific name |
Neogastropoda Thiele, 1929 |
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Suborder Neogastropoda Thiele, 1929 View in CoL Neogastropoda indet.
Fig. 12D View Fig .
Material.—Single incomplete shell (UMUT MM30188) from Yasukawa partially embedded in the rock matrix.
Dimensions.—The visible part of the shell UMUT MM30188 is 4.44 mm high and 3.77 mm wide.
Description.—Only lateral flank of half−whorl is preserved. The shell possesses a wide ramp at the suture. There are seven sturdy orthocline axial ribs and approximately twelve much weaker spiral ribs on the visible part of the shell. The ramp is demarcated from the flank by an additional spiral rib ornamented with blunt nodes appearing at the intersections with axial ribs. There is an additional spiral rib on the ramp surface. The shell is elongated abapically suggesting the presence of a siphonal notch or channel.
Discussion.—The shell under consideration is too incompletely preserved to be assigned to any genus or species. There are similar neogastropods known from Recent seep/ vent communities off Japan. Especially similar are some species of Oenopota described by Okutani and Fujikura (1992) and Okutani et al. (1993). A similar species from an Oligocene seep carbonate in Washington State has been classified by Kiel (2006) as Benthomangelia ? sp. The species under consideration differs both from the Recent Japanese and Oligocene American species in having orthocline rather than opisthocyrt axial ribs. It should be stated here, however, that there is also a number of shallow water neogastropods in the Cretaceous to which the Yasukawa specimen can be related.
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