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Exochosphaeridium muelleri
Exochosphaeridium muelleri Yun Hyesu, 1981, p.25–26, pl.4, figs.12,14–15; pl.5, figs.9,11. Holotype: Yun Hyesu, 1981, pl.4, fig.12;
Fensome et al., 1991, fig.1 — p.685. Ziaja (1989, p.214) considered Hystrichosphaeridium (as Exochosphaeridium)
pseudhystrichodinium to be the questionable taxonomic senior synonym of this species. Age: early Santonian.
Translation Yun, 1981: Fensome et al., 1991, p. 686 (descriptions) and LPP (affinities)
Original description: Yun, 1981, p. 25-26
Diagnosis: A proximochorate-chorate cyst with numerous evexate processes which are thickened and truncated distally or shortly furcate. Occasionally they are forked at midlength. A larger, medially ramified or occasionally simple spine occurs at the apex. A monotabulate, precingular archeopyle of Type P is present.
Description: The oval cyst comprises an endophragm and a thin, smooth periphragm which gives rise to the hollow, distally closed spines. The length of the spines usually equals one half of the smallest radius of the central body. The spine-free paracingulum is characterized by processes arranged in rows along its two margins.
Dimensions: Holotype: central body 48x48 Ám, maximum process length 10 Ám. Range: central body 45(56)66 Ám, maximum process length 10(13)18 Ám, number of processes 120-150.
Affinities:
Yun, 1981, p. 26
Exochosphaeridum muelleri differs from E. phragmites in the smooth surface and the dominating, isolated processes. E. phragmites possesses flattened, fibrous processes, which are, 2-5 together, proximally or medially interconnected.
Fensome et al., 1991, fig.1 — p.685. Ziaja (1989, p.214) considered Hystrichosphaeridium (as Exochosphaeridium)
pseudhystrichodinium to be the questionable taxonomic senior synonym of this species. Age: early Santonian.
Translation Yun, 1981: Fensome et al., 1991, p. 686 (descriptions) and LPP (affinities)
Original description: Yun, 1981, p. 25-26
Diagnosis: A proximochorate-chorate cyst with numerous evexate processes which are thickened and truncated distally or shortly furcate. Occasionally they are forked at midlength. A larger, medially ramified or occasionally simple spine occurs at the apex. A monotabulate, precingular archeopyle of Type P is present.
Description: The oval cyst comprises an endophragm and a thin, smooth periphragm which gives rise to the hollow, distally closed spines. The length of the spines usually equals one half of the smallest radius of the central body. The spine-free paracingulum is characterized by processes arranged in rows along its two margins.
Dimensions: Holotype: central body 48x48 Ám, maximum process length 10 Ám. Range: central body 45(56)66 Ám, maximum process length 10(13)18 Ám, number of processes 120-150.
Affinities:
Yun, 1981, p. 26
Exochosphaeridum muelleri differs from E. phragmites in the smooth surface and the dominating, isolated processes. E. phragmites possesses flattened, fibrous processes, which are, 2-5 together, proximally or medially interconnected.