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Inversidinium minusculum
Inversidinium minisculum (Alberti, 1961) Costa and Downie, 1979
Now Palaeotetradinium. Originally Wetzeliella subgen. Rhombodinium, subsequently Rhombodinium?, thirdly Inversidinium, fourthly (and now) Palaeotetradinium.
Tax. sr. synonyrn of Inversidinium exilimurum McLean, 1973, according to Stover and Evitt, 1978.
Inversidinium minusculum therefore becomes the correct name for the type species of Inversidinium, but the nomenclatural type of the genus remains the holotype of Inuersidinium exilimurum. Lentin and Williams, 1981, retained this species in Palaeotetradinium.
Age: Early Eocene
Holotype: Alberti, 1961, pl.1, fig.10, pl.12, fig.4
Locus typicus: Hildesheim, Germany
Stratum typicum: Lower Eocene
Translation Alberti, 1961: LPP
Original diagnosis: Alberti, 1961, p. 10: Wetzeliella miniscula
Shell flattened, almost rhomboedrical; wepitheca triangular slightly elongated. Lateral horns short, indented at the free ends. Transverse furrow indicated. Epitheca shorter than the inverse hat-shaped hypotheca. With two antapical bulges, seperated by parallel to the longitudinal direction running gap. Presumably with a delicate inner body. The shell membrane is transparent, yellowish. A transverse furrow is indicated on one side ( may be a fault). A pylome is questionable.
Now Palaeotetradinium. Originally Wetzeliella subgen. Rhombodinium, subsequently Rhombodinium?, thirdly Inversidinium, fourthly (and now) Palaeotetradinium.
Tax. sr. synonyrn of Inversidinium exilimurum McLean, 1973, according to Stover and Evitt, 1978.
Inversidinium minusculum therefore becomes the correct name for the type species of Inversidinium, but the nomenclatural type of the genus remains the holotype of Inuersidinium exilimurum. Lentin and Williams, 1981, retained this species in Palaeotetradinium.
Age: Early Eocene
Holotype: Alberti, 1961, pl.1, fig.10, pl.12, fig.4
Locus typicus: Hildesheim, Germany
Stratum typicum: Lower Eocene
Translation Alberti, 1961: LPP
Original diagnosis: Alberti, 1961, p. 10: Wetzeliella miniscula
Shell flattened, almost rhomboedrical; wepitheca triangular slightly elongated. Lateral horns short, indented at the free ends. Transverse furrow indicated. Epitheca shorter than the inverse hat-shaped hypotheca. With two antapical bulges, seperated by parallel to the longitudinal direction running gap. Presumably with a delicate inner body. The shell membrane is transparent, yellowish. A transverse furrow is indicated on one side ( may be a fault). A pylome is questionable.