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Sentusidinium spongiosum
From Fensome et al., 2019:
Sentusidinium spongiosum (Batten and Lister, 1988, p.344–345, figs.4e–h) Wood et al., 2016, p.88. Holotype: Batten and Lister, 1988, figs.4e–g. Originally Kallosphaeridium?, subsequently (and now) Sentusidinium?. Questionable assignment: Wood et al. (2016, p.88), as a problematical species. Age: late Hauterivian.
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Original diagnosis: Batten and Lister, 1988, p.344-345
Small, subspherical, proximate, thin-walled (c. 1 Ám) cyst; maximum diameter 30(34)37 x 30(36)40 Ám (10 specimens). Wall an autophragm, surface densely covered with small granules and short (c.1 Ám) pila, sometimes forming thickened vermiculate structures. Typically, sculptural elements coalesce to form a spongy, delicate ectophragm but this is not always obviously displayed. Paratabulation usually weakly expressed by a more pronounced granulation along parasutural boundaries than elsewhere. Archeopyle apical/?intercalary, operculum angular in outline and ventrally adnate. Archeopyle margin formed by camerate precingular paraplates frequently separated by deep accessory sutures.
Sentusidinium spongiosum (Batten and Lister, 1988, p.344–345, figs.4e–h) Wood et al., 2016, p.88. Holotype: Batten and Lister, 1988, figs.4e–g. Originally Kallosphaeridium?, subsequently (and now) Sentusidinium?. Questionable assignment: Wood et al. (2016, p.88), as a problematical species. Age: late Hauterivian.
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Original diagnosis: Batten and Lister, 1988, p.344-345
Small, subspherical, proximate, thin-walled (c. 1 Ám) cyst; maximum diameter 30(34)37 x 30(36)40 Ám (10 specimens). Wall an autophragm, surface densely covered with small granules and short (c.1 Ám) pila, sometimes forming thickened vermiculate structures. Typically, sculptural elements coalesce to form a spongy, delicate ectophragm but this is not always obviously displayed. Paratabulation usually weakly expressed by a more pronounced granulation along parasutural boundaries than elsewhere. Archeopyle apical/?intercalary, operculum angular in outline and ventrally adnate. Archeopyle margin formed by camerate precingular paraplates frequently separated by deep accessory sutures.