Back
Heterosphaeridium multifurcatum
Heterosphaeridium multifurcatum (Deflandre, 1937b, p.76, pl.16 [al. pl.13], figs.1–3) Islam, 1993, p.84. Emendation: Masure in Fauconnier and Masure, 2004, p.270, as Exochosphaeridium multifurcatum.
NOW Exochosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Acritarch), thirdly Cleistosphaeridium, fourthly Cleistosphaeridium?, fifthly Heterosphaeridium, sixthly (and now) Exochosphaeridium.
Holotype: Deflandre, 1937b, pl.16 (al. pl.13), figs.1–2; Fensome et al., 1991, figs.1–2 — p.691; fig.1 — p.693; Fensome et al., 1993a, fig.1 — p.1261; figs.1–2 — p.1265; Fauconnier and Masure, 2004, pl.37, figs.10–11.
Locus typicus: Paris, France
Stratum typicum: Cretaceous
Translation Deflandre, 1937: Fensome, 1991, p. 692
Original description: Deflandre, 1937, p. 76: Hystrichosphaeridium? multifurcatum
This is a collective species, susceptible to being later dismembered. Thus, under this name, I include all globular Hystrichosphaeridium covered with numerous branched processes, whose height does not exceed one quarter of the diameter of the shell and is very often less. Generally all the processes are branched, but the type, illustrated here, shows some with simple pointed extremities. The surface is entirely reticulate, or covered with a sort of vermiculate ornamentation which cannot be analysed except at very high magnification.
NOW Exochosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Acritarch), thirdly Cleistosphaeridium, fourthly Cleistosphaeridium?, fifthly Heterosphaeridium, sixthly (and now) Exochosphaeridium.
Holotype: Deflandre, 1937b, pl.16 (al. pl.13), figs.1–2; Fensome et al., 1991, figs.1–2 — p.691; fig.1 — p.693; Fensome et al., 1993a, fig.1 — p.1261; figs.1–2 — p.1265; Fauconnier and Masure, 2004, pl.37, figs.10–11.
Locus typicus: Paris, France
Stratum typicum: Cretaceous
Translation Deflandre, 1937: Fensome, 1991, p. 692
Original description: Deflandre, 1937, p. 76: Hystrichosphaeridium? multifurcatum
This is a collective species, susceptible to being later dismembered. Thus, under this name, I include all globular Hystrichosphaeridium covered with numerous branched processes, whose height does not exceed one quarter of the diameter of the shell and is very often less. Generally all the processes are branched, but the type, illustrated here, shows some with simple pointed extremities. The surface is entirely reticulate, or covered with a sort of vermiculate ornamentation which cannot be analysed except at very high magnification.