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Achomosphaera translucenta
From Fensome et al., 2019:
Achomosphaera translucenta, (Sah et al., 1970, p.147, pl.2, figs.18–19) Jain, 1982, p.52.
Holotype: Sah et al., 1970, pl.2, fig.18.
Originally Hystrichosphaeridium, subsequently Hystrichosphaeridium?, thirdly (and now) Achomosphaera. Jain (1982, p.52) considered the specimen illustrated by Sah et al. (1970, pl.2, fig.19) to be Cordosphaeridium inodes.
Age: Late Cretaceous.
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Original description as Hystrichosphaeridium translucentum: [Sah et al., 1970, p. 147]:
Hystrichosphaeridium transculentum sp. nov.
PI. 2, Figs. 18-19
Holotype -- PI. 2, Fig. 18. Size 76 x 72 μ.
Slide no. 3647.
No. of specimens studied -- 17.
Diagnosis -- Cysts subcircular, 60-86 x 57-84 μ; processes with tufted tips, generally up to 30 in number; archeopyle apical; cyst membrane sculptured with translucent coni.
Description- Cysts sometimes with small irregular folds. Archeopyle mostly closed. Processes evenly distributed, up to 30 μ, dichotomizing at the tip region. Cyst membrane 1-1·5 μ thick, coni 2-3 μ in height, closely placed, evenly distributed, forming negative reticulum in surface view.
Comparison -- Hystrichosphaeridium difficile Man. (1964) shows close resemblance with the present species in shape, size, nature of the archeopyle and the number of processes but the latter differs in having translucent sculptural elements. H. assamicum approximates H. transculentum in size and nature of the processes but the former is characterized by having a laevigate cyst membrane.
Achomosphaera translucenta, (Sah et al., 1970, p.147, pl.2, figs.18–19) Jain, 1982, p.52.
Holotype: Sah et al., 1970, pl.2, fig.18.
Originally Hystrichosphaeridium, subsequently Hystrichosphaeridium?, thirdly (and now) Achomosphaera. Jain (1982, p.52) considered the specimen illustrated by Sah et al. (1970, pl.2, fig.19) to be Cordosphaeridium inodes.
Age: Late Cretaceous.
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Original description as Hystrichosphaeridium translucentum: [Sah et al., 1970, p. 147]:
Hystrichosphaeridium transculentum sp. nov.
PI. 2, Figs. 18-19
Holotype -- PI. 2, Fig. 18. Size 76 x 72 μ.
Slide no. 3647.
No. of specimens studied -- 17.
Diagnosis -- Cysts subcircular, 60-86 x 57-84 μ; processes with tufted tips, generally up to 30 in number; archeopyle apical; cyst membrane sculptured with translucent coni.
Description- Cysts sometimes with small irregular folds. Archeopyle mostly closed. Processes evenly distributed, up to 30 μ, dichotomizing at the tip region. Cyst membrane 1-1·5 μ thick, coni 2-3 μ in height, closely placed, evenly distributed, forming negative reticulum in surface view.
Comparison -- Hystrichosphaeridium difficile Man. (1964) shows close resemblance with the present species in shape, size, nature of the archeopyle and the number of processes but the latter differs in having translucent sculptural elements. H. assamicum approximates H. transculentum in size and nature of the processes but the former is characterized by having a laevigate cyst membrane.