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Cleistosphaeridium sphericum
From Fensome et al., 2019:
Cleistosphaeridium ?sphericum Horowitz, 1975, p.24, pl.1, fig.5. Holotype: Horowitz, 1975, pl.1, fig.5. NOW Impletosphaeridium?. Originally Cleistosphaeridium, subsequently Cleistosphaeridium?, thirdly (and now) Impletosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.32) as a problematic species. Age: Late Jurassic.
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Original description (Horowitz, 1975) translation PKB 2024
Holotype: plate P 301, Zohar 8 survey, depth l 003 m, Upper Jurassic, South of Israel.
Description: chorate Dinoflagellate cyst. Spherical body, delicate membrane, less than 1µ thick, very granular. Apparent equatorial cingulum, 2-3 µ wide, encircling the body. Processes 5-8 µ long, few in number, most often arches, bi or trifurcates. Average size: 40 µ 15 specimens.
Discussion: This species differs from other species of Cleistosphaeridium by the smallest number of its processes, usually not exceeding 25-30. It also appears frequently in the Jurassic of southern Israel. Origin of the name: after the spherical shape of the body.
Cleistosphaeridium ?sphericum Horowitz, 1975, p.24, pl.1, fig.5. Holotype: Horowitz, 1975, pl.1, fig.5. NOW Impletosphaeridium?. Originally Cleistosphaeridium, subsequently Cleistosphaeridium?, thirdly (and now) Impletosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.32) as a problematic species. Age: Late Jurassic.
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Original description (Horowitz, 1975) translation PKB 2024
Holotype: plate P 301, Zohar 8 survey, depth l 003 m, Upper Jurassic, South of Israel.
Description: chorate Dinoflagellate cyst. Spherical body, delicate membrane, less than 1µ thick, very granular. Apparent equatorial cingulum, 2-3 µ wide, encircling the body. Processes 5-8 µ long, few in number, most often arches, bi or trifurcates. Average size: 40 µ 15 specimens.
Discussion: This species differs from other species of Cleistosphaeridium by the smallest number of its processes, usually not exceeding 25-30. It also appears frequently in the Jurassic of southern Israel. Origin of the name: after the spherical shape of the body.