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Oligosphaeridium totum var. totum
Oligosphaeridium totum var. totum
Autonym, now redundant.
Holotype: Brideaux, 1971, pl.25, fig.53
Locus typicus: Alberta, Canada
Stratum typicum: Late Albian
Original description (Holotype): Brideaux, 1971, p.88
Maximum width, 42 µm; 14 processes present corresponding to a tabulation scheme of 6", 0c, 5""", 1p, 1"""", 1s; columns of processes wider basally, narrowing medially, and flaring at their apices; processes open, margins entire, buccinate, edges sometimes irregular, a few fenestrae present; processes 21-36 µm long and 3-9 µm wide basally. Archeopyle apical, margin irregular. Thin two-layered wall, scabrate.
Description: Brideaux, 1971, p.88
Cyst outline in lateral view subcircular, in apical view circular or subcircular. Wall thin, scabrate, two-layered, the outer layer giving rise to biconcave, obconical or nearly tubular processes; the processes with buccinate, entire apices, occasionally with slightly serrate edges and scattered fenestrae; open apically, hollow, and with bases expanding slightly at the junction of cyst wall and processes. Numerous complete specimens bear no more than 18 processes; those bearing a polygonal apical archeopyle often bear 14 processes, one process appearing smaller, probably corresponding to a sulcul process. Arrangement of processes on suitably oriented specimens appears to correspond to a reflected tabulation scheme of 4", 6", 0c, 5-?6", 1p. 1"""", ?1s.
Dimensions: Length of 30 measured specimens (with and without archeopyle), 36-59 µm; width on 21 measured specimens, 29-48 µm; length of processes, 12-37 µm; basal width of processes, 3-12 µm. Total of 52 specimens recorded.
Remarks: A number of specimens possess only 8 or 9 processes. It is suggested that the remaining processes were lost as a result of mechanical breakage either during fossilization or during the maceration process. Such an interpretation is supported by the occasional occurrence of specimens bearing rounded breaks in the cyst wall which correspond in position to normal emplacement of processes.
Affinities:
Brideaux, 1971, p.88: Oligosphaeridium totum var. totum is distinguished by its relatively large, biconcave, buccinate, entire-margined processes. Oligosphaeridium albertense has irregular processes which are larger and which have serrate or aculeate margins.
Autonym, now redundant.
Holotype: Brideaux, 1971, pl.25, fig.53
Locus typicus: Alberta, Canada
Stratum typicum: Late Albian
Original description (Holotype): Brideaux, 1971, p.88
Maximum width, 42 µm; 14 processes present corresponding to a tabulation scheme of 6", 0c, 5""", 1p, 1"""", 1s; columns of processes wider basally, narrowing medially, and flaring at their apices; processes open, margins entire, buccinate, edges sometimes irregular, a few fenestrae present; processes 21-36 µm long and 3-9 µm wide basally. Archeopyle apical, margin irregular. Thin two-layered wall, scabrate.
Description: Brideaux, 1971, p.88
Cyst outline in lateral view subcircular, in apical view circular or subcircular. Wall thin, scabrate, two-layered, the outer layer giving rise to biconcave, obconical or nearly tubular processes; the processes with buccinate, entire apices, occasionally with slightly serrate edges and scattered fenestrae; open apically, hollow, and with bases expanding slightly at the junction of cyst wall and processes. Numerous complete specimens bear no more than 18 processes; those bearing a polygonal apical archeopyle often bear 14 processes, one process appearing smaller, probably corresponding to a sulcul process. Arrangement of processes on suitably oriented specimens appears to correspond to a reflected tabulation scheme of 4", 6", 0c, 5-?6", 1p. 1"""", ?1s.
Dimensions: Length of 30 measured specimens (with and without archeopyle), 36-59 µm; width on 21 measured specimens, 29-48 µm; length of processes, 12-37 µm; basal width of processes, 3-12 µm. Total of 52 specimens recorded.
Remarks: A number of specimens possess only 8 or 9 processes. It is suggested that the remaining processes were lost as a result of mechanical breakage either during fossilization or during the maceration process. Such an interpretation is supported by the occasional occurrence of specimens bearing rounded breaks in the cyst wall which correspond in position to normal emplacement of processes.
Affinities:
Brideaux, 1971, p.88: Oligosphaeridium totum var. totum is distinguished by its relatively large, biconcave, buccinate, entire-margined processes. Oligosphaeridium albertense has irregular processes which are larger and which have serrate or aculeate margins.