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Impagidinium gracilium
From Fensome et al., 2019:
Impagidinium gracilium Shaw Chenglong, 1999b, p.170, figs.37–42. Holotype: Shaw Chenglong, 1999b, figs.37–39. Age: Eocene.
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Original description (Shaw Chenglong, 1999b)
Description: Cyst small size, subspherical; 33-45 µm long, 32-38 µm wide; autophragm thin, smooth, bearing low, smooth-crested parasutural septa. Precingular archeopyle, distinct. Second and third apical paraplates large, and comprise significant area of upper dorsal epicyst; first and fourth apical paraplates relatively narrow and elongate. Paratabulation well dined; no apparent subdivision into sulcul paraplates.
Stratigraphic occurence: Eocene (OK-1 well, 1788 m; OK-3well, 1750m).
Derivation of name: Latin, gracilium, small; with reference to the smaller size.
Dimensions holotype: Overall 45 µm long, 38µm wide, height of septa 2-3 µm.
Dimensions overall: 33-45 µm long, 32-38 µm wide, height of septa 1.5-3 µm (n=3)
Remarks: The new species most colsely resembles Impagidinium crassimuratum Wilson, but differs from that species in having smller size and in having thin autophragm.
Impagidinium gracilium Shaw Chenglong, 1999b, p.170, figs.37–42. Holotype: Shaw Chenglong, 1999b, figs.37–39. Age: Eocene.
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Original description (Shaw Chenglong, 1999b)
Description: Cyst small size, subspherical; 33-45 µm long, 32-38 µm wide; autophragm thin, smooth, bearing low, smooth-crested parasutural septa. Precingular archeopyle, distinct. Second and third apical paraplates large, and comprise significant area of upper dorsal epicyst; first and fourth apical paraplates relatively narrow and elongate. Paratabulation well dined; no apparent subdivision into sulcul paraplates.
Stratigraphic occurence: Eocene (OK-1 well, 1788 m; OK-3well, 1750m).
Derivation of name: Latin, gracilium, small; with reference to the smaller size.
Dimensions holotype: Overall 45 µm long, 38µm wide, height of septa 2-3 µm.
Dimensions overall: 33-45 µm long, 32-38 µm wide, height of septa 1.5-3 µm (n=3)
Remarks: The new species most colsely resembles Impagidinium crassimuratum Wilson, but differs from that species in having smller size and in having thin autophragm.