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Pilosidinium assymetricum
Pilosidinium asymmetricum (Pocock, 1972, p.107, pl.26, figs.29–30) Courtinat in Fauconnier and Masure, 2004, p.447.
Holotype: Pocock, 1972, pl.26, fig.29; Fauconnier and Masure, pl.63, fig.15. Originally Leiosphaeridia (Appendix A), subsequently Sentusidinium, thirdly (and now) Pilosidinium.
Taxonomic junior synonym: Sentusidinium (as Pilosidinium) fibrosum, according to Courtinat in Fauconnier and Masure, 2004, p.447. Age: late Bajocian–early Bathonian.
Original description: Pocock, 1972, p.107
Vesicle spherical, extended at one end in the form of a conical process about 5.0µm long and with a basal width of 5.0µm; densely spinose; spines pinnate; less than 0.5µm wide and 2.5-3.0µm long; spines spaced about 1.0µm apart over most of the vesicle but less closely packed over an area about 5.0µm wide situated immediately below the process frequent tears around the vesicle at the base of the process together with its complete absence from many specimens, suggests apical archeopyle formation; vesicle very thin; single layered; colourless to pale yellow; size range 35.2 (36.6) 40.0 x 27.0 (31.0) 33.0µm.
Holotype: Pocock, 1972, pl.26, fig.29; Fauconnier and Masure, pl.63, fig.15. Originally Leiosphaeridia (Appendix A), subsequently Sentusidinium, thirdly (and now) Pilosidinium.
Taxonomic junior synonym: Sentusidinium (as Pilosidinium) fibrosum, according to Courtinat in Fauconnier and Masure, 2004, p.447. Age: late Bajocian–early Bathonian.
Original description: Pocock, 1972, p.107
Vesicle spherical, extended at one end in the form of a conical process about 5.0µm long and with a basal width of 5.0µm; densely spinose; spines pinnate; less than 0.5µm wide and 2.5-3.0µm long; spines spaced about 1.0µm apart over most of the vesicle but less closely packed over an area about 5.0µm wide situated immediately below the process frequent tears around the vesicle at the base of the process together with its complete absence from many specimens, suggests apical archeopyle formation; vesicle very thin; single layered; colourless to pale yellow; size range 35.2 (36.6) 40.0 x 27.0 (31.0) 33.0µm.