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Hystrichosphaeridium mineralosum
Hystrichosphaeridium mineralosum Varma and Dangwal, 1964
Stover and Evitt, 1978, considered this to be a problematical species of Hystrichosphaeridium.
Holotype: Varma and Dangwal, 1964, pl.1, fig.9
Locus typicus: W India, Cambay Basin, C.D.W. no. 1
Stratum typicum: Eocene-Oligocene
Original diagnosis: Varma and Dangwal, 1964, p.64
Body usually spherical, sometimes oval to irregular, granular, giving a characteristic appearance of an aggregation of mineral particles. Body wall usually concealed, rarely seen to be thin. Processes radiating from all over the body, small, transparent, very difficult to observe under magnifications of low power. Bodv comparatively darker. Processes simple, spinelike or hairlike, solid or hollow, unbranched, generally stiff and seldom supple. Some show a rather broad base. The shafts of the processes narrovv slightly towards the blunt tips. Tips of the processes of some individuals show labiate, discoidal or cup-shaped structures Individuals showing these minor variations have been classified by the authors as subspecies of H. mineralosum.
Measurement: Diameter of body ca. 30-45 µm; length of processes ca. 7.8-15.6 µm.
Affinities:
Varma and Dangwal, 1964, p.64: At first sight one would detect a resemblance to H. centrocarpum Deflandre and Cookson, but on detailed comparison one finds that the Australian species has a bigger body and shows major differences in the organisation of the body, wall and processes, hence our specimens have to be treated as a new species.
Stover and Evitt, 1978, considered this to be a problematical species of Hystrichosphaeridium.
Holotype: Varma and Dangwal, 1964, pl.1, fig.9
Locus typicus: W India, Cambay Basin, C.D.W. no. 1
Stratum typicum: Eocene-Oligocene
Original diagnosis: Varma and Dangwal, 1964, p.64
Body usually spherical, sometimes oval to irregular, granular, giving a characteristic appearance of an aggregation of mineral particles. Body wall usually concealed, rarely seen to be thin. Processes radiating from all over the body, small, transparent, very difficult to observe under magnifications of low power. Bodv comparatively darker. Processes simple, spinelike or hairlike, solid or hollow, unbranched, generally stiff and seldom supple. Some show a rather broad base. The shafts of the processes narrovv slightly towards the blunt tips. Tips of the processes of some individuals show labiate, discoidal or cup-shaped structures Individuals showing these minor variations have been classified by the authors as subspecies of H. mineralosum.
Measurement: Diameter of body ca. 30-45 µm; length of processes ca. 7.8-15.6 µm.
Affinities:
Varma and Dangwal, 1964, p.64: At first sight one would detect a resemblance to H. centrocarpum Deflandre and Cookson, but on detailed comparison one finds that the Australian species has a bigger body and shows major differences in the organisation of the body, wall and processes, hence our specimens have to be treated as a new species.