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Homotryblium pallidum
Homotryblium "pallidum" Davey and Williams, 1966b, p.102-103, pl.12, figs.4,6; text-fig.22.
Taxonomic senior synonym: Homotryblium tenuispinosum, according to Edwards (1996, p.989). However, we here retain H. pallidum.
Holotype: Davey and Williams, 1966b, pl.12, fig.6; Bujak et al., 1980, pl.1, figs.1-3.
Age: Early Eocene.
Original diagnosis: Davey and Williams, p. 103
Sub-spherical to ovoidal central body composed of thin inner endophragm and granular periphragm. Processes of variable width, simple, tubiform, forming a circle where they arise from central body. Archaeopyle epitractal and processes reflecting generic tabulation.
Dimensions: holotype: diameter of central body 45 by 48 Ám, length of processes up to 25 Ám. Range: diameter of central body 40-49 Ám, length of processes 16-34 Ám. Number of processes 5.
Original description: Davey and Williams, 1966, p. 103
H. pallidum exhibits similar tabulation to H. tenuispinosum of 3", 6"", 6c, 5""", 1p, 1"""" with almost invariably only three sulcal plates. The central body, which takes stain only slightly having a very thin wall, has granules up to 0.5 Ám in height and 0.5 Ám to 1.5 Ám apart. The processes are cylindrical tubiform and in length closely approach the radius of the central body. Distally they are variable, in some specimens having an entire irregular margin, in others a serrate, aculeate or digitate margin. Besides the tubiform processes there are often present 1 to 5 slender small acuminate processes. The latter can occur on the hypo- or epitract.
Affinities:
Davey and Williams, p. 103: H. pallidum differs from H. tenuispinosum in having a thinner wall, generally broader processes with more variable distal margins, and a well marked proximal circle where they arise from the central body. It also differs by having some very slender acuminate processes. The specimens with processes having entire circular or serrate margins appear to be closely related to Hystrichosphaeridium choanophorum Deflandre & Cookson (1955) from the Miocene of Australia, although Gerlach (1961) recognized what appears to be an apical archaeopyle in this species.
Taxonomic senior synonym: Homotryblium tenuispinosum, according to Edwards (1996, p.989). However, we here retain H. pallidum.
Holotype: Davey and Williams, 1966b, pl.12, fig.6; Bujak et al., 1980, pl.1, figs.1-3.
Age: Early Eocene.
Original diagnosis: Davey and Williams, p. 103
Sub-spherical to ovoidal central body composed of thin inner endophragm and granular periphragm. Processes of variable width, simple, tubiform, forming a circle where they arise from central body. Archaeopyle epitractal and processes reflecting generic tabulation.
Dimensions: holotype: diameter of central body 45 by 48 Ám, length of processes up to 25 Ám. Range: diameter of central body 40-49 Ám, length of processes 16-34 Ám. Number of processes 5.
Original description: Davey and Williams, 1966, p. 103
H. pallidum exhibits similar tabulation to H. tenuispinosum of 3", 6"", 6c, 5""", 1p, 1"""" with almost invariably only three sulcal plates. The central body, which takes stain only slightly having a very thin wall, has granules up to 0.5 Ám in height and 0.5 Ám to 1.5 Ám apart. The processes are cylindrical tubiform and in length closely approach the radius of the central body. Distally they are variable, in some specimens having an entire irregular margin, in others a serrate, aculeate or digitate margin. Besides the tubiform processes there are often present 1 to 5 slender small acuminate processes. The latter can occur on the hypo- or epitract.
Affinities:
Davey and Williams, p. 103: H. pallidum differs from H. tenuispinosum in having a thinner wall, generally broader processes with more variable distal margins, and a well marked proximal circle where they arise from the central body. It also differs by having some very slender acuminate processes. The specimens with processes having entire circular or serrate margins appear to be closely related to Hystrichosphaeridium choanophorum Deflandre & Cookson (1955) from the Miocene of Australia, although Gerlach (1961) recognized what appears to be an apical archaeopyle in this species.