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Hystrichosphaeropsis tubulata
Hystrichosphaeropsis tubulata (O. Wetzel, 1961) Sarjeant, 1985
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. Lentin and Williams, 1977, retained Hystrichosphaeropsis (as Triblastula) tubulata as a separate species. Marheinecke, 1992, accepted the synonymy without question.
Holotype: O. Wetzel, 1961, pl.2, fig.4
Locus typicus: Flint inclusion
Stratum typicum: Erratic, ?Late Cretaceous
Original diagnosis: O. Wetzel, 1961, p.340: Triblastula tubulata
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: 80x45 Ám.
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. Lentin and Williams, 1977, retained Hystrichosphaeropsis (as Triblastula) tubulata as a separate species. Marheinecke, 1992, accepted the synonymy without question.
Holotype: O. Wetzel, 1961, pl.2, fig.4
Locus typicus: Flint inclusion
Stratum typicum: Erratic, ?Late Cretaceous
Original diagnosis: O. Wetzel, 1961, p.340: Triblastula tubulata
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: 80x45 Ám.