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Triblastula tubulata
Triblastula tubulata O. Wetzel, 1961
Originally Triblastula, subsequently Hystrichosphaeropsis.
Questionable tax. jr. synonym of Hystrichosphaeropsis (originally Triblastula) quasicribrata (O. Wetzel, 1961) Gocht, 1976, according to Gocht, 1976 and Stover and Evitt, 1978; however, Lentin and Williams, 1977 retained Triblastula tubulata as a separate species. Marheinecke, 1992 accepted the synonymy without question.
Holotype: O. Wetzel, 1961, pl.2, fig.4
Locus typicus: Feuerstein-Einschluß, Senonian
Stratum typicum: Erratikum ?Late Cretaceous
Original diagnosis: O. Wetzel, 1961, p.340
Overall appearance slender, the tripartition less abrupt then in Triblastula nuda O. Wetzel; like that form, it also lacks bristles. The two "pole-caps" narrowly embrace the equatorial circle of the central sphere and are drawn out with somewhat concave outlines in opposite directions; one (the "epitheca") ends in a short, humplike "apex", but the other remains cylindrical, like a truncated tube. A pylome appears to be present below the "apex"; in other respects the fossil is not sufficiently transparent to permit further observations.
Dimensions: 80 x 45 µm.
Originally Triblastula, subsequently Hystrichosphaeropsis.
Questionable tax. jr. synonym of Hystrichosphaeropsis (originally Triblastula) quasicribrata (O. Wetzel, 1961) Gocht, 1976, according to Gocht, 1976 and Stover and Evitt, 1978; however, Lentin and Williams, 1977 retained Triblastula tubulata as a separate species. Marheinecke, 1992 accepted the synonymy without question.
Holotype: O. Wetzel, 1961, pl.2, fig.4
Locus typicus: Feuerstein-Einschluß, Senonian
Stratum typicum: Erratikum ?Late Cretaceous
Original diagnosis: O. Wetzel, 1961, p.340
Overall appearance slender, the tripartition less abrupt then in Triblastula nuda O. Wetzel; like that form, it also lacks bristles. The two "pole-caps" narrowly embrace the equatorial circle of the central sphere and are drawn out with somewhat concave outlines in opposite directions; one (the "epitheca") ends in a short, humplike "apex", but the other remains cylindrical, like a truncated tube. A pylome appears to be present below the "apex"; in other respects the fossil is not sufficiently transparent to permit further observations.
Dimensions: 80 x 45 µm.