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Hystrichokolpoma spinosum
Hystrichokolpoma spinosum Wilson, 1988, p.22, pl.10, figs.7a-b,8.
Holotype: Wilson, 1988, pl.10, figs.7a-b; Fensome et al., 1996, figs.1-2 - p.2375; Fauconnier and Masure, 2004, pl.41, fig.4.
Age: Early-Mid Eocene (Waipawan-Heretaungan); see Fensome et al. (1996, p.2376).
Original description: Wilson, 1988, p. 22
Cyst of intermediate size, bi-layered, with thin smooth endophragm and periphragm; both layers in close contact except at base of intratabular processes. Precingular and postcingular processes fairly short, conical to polygonal, hollow with closed tips and adorned with thin solid spines (length up to 11 Ám) at the distal extremity. Antapical process relatively large, conical, and adorned with numerous short spinules (length 2-3 µm). Paracingular and parasulcal processes simple or bifurcate, relatively long and thin. Apical process relatively long and spiny. Paratabulation 1-4", 6"", 6c, 5-6""", 1p, 1"""", 5-6s. Archeopyle with zig-zag margin and deep parasulcal notch. Paracingulum indicated by up to 12 single or bifurcate processes, interrupted by parasulcus on ventral surface.
Dimensions: Holotype: overall length (including operculum) 86 µm, breadth 62 µm, length of endocyst 54 µm, breadth 46 µm. Range: overall breadth 59(65)76 µm, breadth of endocyst 32(44)35 µm (n = 10).
Affinities:
Wilson, 1988, p. 22: The species has some resemblance to H. torquatum Damassa but differs in having more prominent distal spines on the processes and in lacking depressed penitabular bands at the base of the processes. A related form with very short spinose processes is illustrated in Plate 11, Fig. 5 (as Hystrichokolpoma sp.).
Holotype: Wilson, 1988, pl.10, figs.7a-b; Fensome et al., 1996, figs.1-2 - p.2375; Fauconnier and Masure, 2004, pl.41, fig.4.
Age: Early-Mid Eocene (Waipawan-Heretaungan); see Fensome et al. (1996, p.2376).
Original description: Wilson, 1988, p. 22
Cyst of intermediate size, bi-layered, with thin smooth endophragm and periphragm; both layers in close contact except at base of intratabular processes. Precingular and postcingular processes fairly short, conical to polygonal, hollow with closed tips and adorned with thin solid spines (length up to 11 Ám) at the distal extremity. Antapical process relatively large, conical, and adorned with numerous short spinules (length 2-3 µm). Paracingular and parasulcal processes simple or bifurcate, relatively long and thin. Apical process relatively long and spiny. Paratabulation 1-4", 6"", 6c, 5-6""", 1p, 1"""", 5-6s. Archeopyle with zig-zag margin and deep parasulcal notch. Paracingulum indicated by up to 12 single or bifurcate processes, interrupted by parasulcus on ventral surface.
Dimensions: Holotype: overall length (including operculum) 86 µm, breadth 62 µm, length of endocyst 54 µm, breadth 46 µm. Range: overall breadth 59(65)76 µm, breadth of endocyst 32(44)35 µm (n = 10).
Affinities:
Wilson, 1988, p. 22: The species has some resemblance to H. torquatum Damassa but differs in having more prominent distal spines on the processes and in lacking depressed penitabular bands at the base of the processes. A related form with very short spinose processes is illustrated in Plate 11, Fig. 5 (as Hystrichokolpoma sp.).