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Hystrichosphaeridium cylindratum*
Hystrichosphaeridium cylindratum Brideaux, 1971
Name illegitimate - senior homonym: Hystrichosphaeridium cylindratum Morgenroth, 1966a. Substitute name: Hystrichosphaeridium brideauxii. Originally Hystrichosphaeridium cylindratum (name illegitimate), subsequently Hystrichosphaeridium brideauxii.
Taxonomic senior synonym: Hystrichosphaeridium (now Florentinia) cooksoniae, according to Harker and Sarjeant (1975, p.225-226).
Holotype: Brideaux, 1971, pl.26, figs.69-70, text-fig.9c
Locus typicus: Alberta, Canada
Stratum typicum: Albian
Original descirption (Holotype): Brideaux, 1971, p.91
Maximum diameter, 62 Ám; cyst body ovoid; processes tubular or slightly flared. hollow, open, entire-margined or weakly serrate; 17 processes visible; 22--30 Ám long, 7--15 Ám wide. Apical archeopyle with irregular margin.
Description: Brideaux, 1971, p.92
Dinoflagellate cyst; apical outline subcircular; lateral outline ovoid to subcircular. Wall thin and smooth or scabrate, often strongly folded; two layered. Process arrangement corresponding to a postulated tabulation scheme of 4-?5", 6", 6c, 5-6""", 1p, 1"""" with ?sulcul processes, based on a study of all specimens. Processes tabular and relatively wide, a few processes may approach a subconical outline; hollow; apices open, little or not at all flared and entire to serrate. No marked size difference occurs between processes of different series, although some specimens may have the cingular processes slightly reduced in size and the antapical process may be slightly larger on some specimens. Archeopyle apical, margin zig-zag, often irregular.
Dimensions: Length on 7 measured specimens, 46--74 Ám; width on 12 measured specimens, 41--63 Ám; length of processes, 10--35 Ám; basal width of processes, 3--24 Ám. Number of processes from 17 on specimens with archeopyles up to 25 on complete specimens. Total of 23 specimens recorded.
Name illegitimate - senior homonym: Hystrichosphaeridium cylindratum Morgenroth, 1966a. Substitute name: Hystrichosphaeridium brideauxii. Originally Hystrichosphaeridium cylindratum (name illegitimate), subsequently Hystrichosphaeridium brideauxii.
Taxonomic senior synonym: Hystrichosphaeridium (now Florentinia) cooksoniae, according to Harker and Sarjeant (1975, p.225-226).
Holotype: Brideaux, 1971, pl.26, figs.69-70, text-fig.9c
Locus typicus: Alberta, Canada
Stratum typicum: Albian
Original descirption (Holotype): Brideaux, 1971, p.91
Maximum diameter, 62 Ám; cyst body ovoid; processes tubular or slightly flared. hollow, open, entire-margined or weakly serrate; 17 processes visible; 22--30 Ám long, 7--15 Ám wide. Apical archeopyle with irregular margin.
Description: Brideaux, 1971, p.92
Dinoflagellate cyst; apical outline subcircular; lateral outline ovoid to subcircular. Wall thin and smooth or scabrate, often strongly folded; two layered. Process arrangement corresponding to a postulated tabulation scheme of 4-?5", 6", 6c, 5-6""", 1p, 1"""" with ?sulcul processes, based on a study of all specimens. Processes tabular and relatively wide, a few processes may approach a subconical outline; hollow; apices open, little or not at all flared and entire to serrate. No marked size difference occurs between processes of different series, although some specimens may have the cingular processes slightly reduced in size and the antapical process may be slightly larger on some specimens. Archeopyle apical, margin zig-zag, often irregular.
Dimensions: Length on 7 measured specimens, 46--74 Ám; width on 12 measured specimens, 41--63 Ám; length of processes, 10--35 Ám; basal width of processes, 3--24 Ám. Number of processes from 17 on specimens with archeopyles up to 25 on complete specimens. Total of 23 specimens recorded.