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Apectodinium geometricum
Apectodinium geometricum, (Pastiels, 1948 ex Downie and Sarjeant, 1965), Fensome et al., 1990
Originally Baltisphaeridium, subsequently (and now) Apectodinium.
Nomenclatural sr. synonym of Apectodinium pastielsii Lentin and Williams, 1989, which was proposed as a new name for Hystrichosphaeridium geometricum Pastiels, 1948. The name Hystrichosphaeridium geometricum Pastiels is an illegitimate junior homonym of Hystrichosphaeridium geometricum Deflandre, 1945. By transferring Pastiels" species to Baltisphaeridium, Downie and Sarjeant, 1965, created the valid and legitimate name Baltisphaeridium geometricum Pastiels, 1948 ex Downie and Sarjeant, 1965. The name Apectodinium pastielsii Lentin and Williams, 1989, is thus superfluous. Harland, 1979c, considered Hystrichosphaeridium (now Apectodinium) geometricum to be a synonym of Wetzeliella homomorpha var. quinquelata Williams and Downie, 1966b (now Apectodinium quinquelatum); however, Lentin and Williams, 1989, retained these two taxa separately. If Harland"s synonymy were to be followed, Apectodinium geometricum (Pastiels, 1948 ex Downie and Sarjeant, 1965) Fensome et al., 1990, would be the correct name since it is senior to Apectodinium quinquelatum (Williams and Downie, 1966b) Costa and Downie, 1979.
Holotype: Pastiels, 1948, pl.4, fig.4
Age: Early Eocene: Ypresian
Originally Baltisphaeridium, subsequently (and now) Apectodinium.
Nomenclatural sr. synonym of Apectodinium pastielsii Lentin and Williams, 1989, which was proposed as a new name for Hystrichosphaeridium geometricum Pastiels, 1948. The name Hystrichosphaeridium geometricum Pastiels is an illegitimate junior homonym of Hystrichosphaeridium geometricum Deflandre, 1945. By transferring Pastiels" species to Baltisphaeridium, Downie and Sarjeant, 1965, created the valid and legitimate name Baltisphaeridium geometricum Pastiels, 1948 ex Downie and Sarjeant, 1965. The name Apectodinium pastielsii Lentin and Williams, 1989, is thus superfluous. Harland, 1979c, considered Hystrichosphaeridium (now Apectodinium) geometricum to be a synonym of Wetzeliella homomorpha var. quinquelata Williams and Downie, 1966b (now Apectodinium quinquelatum); however, Lentin and Williams, 1989, retained these two taxa separately. If Harland"s synonymy were to be followed, Apectodinium geometricum (Pastiels, 1948 ex Downie and Sarjeant, 1965) Fensome et al., 1990, would be the correct name since it is senior to Apectodinium quinquelatum (Williams and Downie, 1966b) Costa and Downie, 1979.
Holotype: Pastiels, 1948, pl.4, fig.4
Age: Early Eocene: Ypresian