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Hystrichokolpoma granulatum
Hystrichokolpoma granulatum Eaton, 1976
Holotype: Eaton, 1976, pl.10, fig.11; Bujak et al., 1980, pl.3, figs.4-6
Locus typicus: Bracklesham Beds, Alum Bay, Isle of Wight, England.
Stratum typicum: Early-Middle Eocene
Original diagnosis: Eaton, 1976, p. 269
Cyst body subspherical with a granular surface. There are two types of granular intratabular processes. Large broad cylindrical processes, restricted to the pre- and postcingular and antapical zones, split distally into short open branches, and may exhibit distal tubules. Slender open processes, restricted to the cingular and sulcal zones, are distally expanded, simple or distally branched. Reflected tabulation 4", 6", 6c, 5""", 1""""; archaeopyle apical, tetratabular.
Dimensions: Holotype: cyst body (without operculum) 39x49 µm; large processes, length up to 20 µm, breadth up to 19 µm; antapical process, length 24 µm, breadth 16 µm; length of slender processes up to 24 µm. Observed range: diameter of cyst body (without operculum) 28-46 µm; large processes, length up to 20 µm, breadth up to 19 µm; antapical process, length up to 24 µm, breadth up to I6 µm; length of slender processes up to 24 µm. (n = 10).
Affinities:
Eaton, 1976, p. 270: Unlike other species of Hystrichokolpoma, the individual plate areas are not clearly defined on the cyst body in H. granulata. On the cingular zone there are typically two, sometimes one process per plate. The antapical process is distinctive, tapering distally with tubules typically developed close to the distal margin. The anterior sulcal process (a.s.) is larger than the other sulcal processes. The form of the apical processes has not been determined. H. granulata is distinguished from other species of Hystrichokolpoma by its distinctive granular ornament, the overall form of the processes and the lack of well-defined plate areas on the cyst body.
Holotype: Eaton, 1976, pl.10, fig.11; Bujak et al., 1980, pl.3, figs.4-6
Locus typicus: Bracklesham Beds, Alum Bay, Isle of Wight, England.
Stratum typicum: Early-Middle Eocene
Original diagnosis: Eaton, 1976, p. 269
Cyst body subspherical with a granular surface. There are two types of granular intratabular processes. Large broad cylindrical processes, restricted to the pre- and postcingular and antapical zones, split distally into short open branches, and may exhibit distal tubules. Slender open processes, restricted to the cingular and sulcal zones, are distally expanded, simple or distally branched. Reflected tabulation 4", 6", 6c, 5""", 1""""; archaeopyle apical, tetratabular.
Dimensions: Holotype: cyst body (without operculum) 39x49 µm; large processes, length up to 20 µm, breadth up to 19 µm; antapical process, length 24 µm, breadth 16 µm; length of slender processes up to 24 µm. Observed range: diameter of cyst body (without operculum) 28-46 µm; large processes, length up to 20 µm, breadth up to 19 µm; antapical process, length up to 24 µm, breadth up to I6 µm; length of slender processes up to 24 µm. (n = 10).
Affinities:
Eaton, 1976, p. 270: Unlike other species of Hystrichokolpoma, the individual plate areas are not clearly defined on the cyst body in H. granulata. On the cingular zone there are typically two, sometimes one process per plate. The antapical process is distinctive, tapering distally with tubules typically developed close to the distal margin. The anterior sulcal process (a.s.) is larger than the other sulcal processes. The form of the apical processes has not been determined. H. granulata is distinguished from other species of Hystrichokolpoma by its distinctive granular ornament, the overall form of the processes and the lack of well-defined plate areas on the cyst body.