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Exochosphaeridium muelleri
Exochosphaeridium muelleri Yun, 1981
Questionable tax. jr. synonym of Exochosphaeridium pseudhystrichodinium (Deflandre, 1937) Davey et al., 1969, according to Ziaja, 1989.
Holotype: Yun, 1981, pl.4, fig.12; Fensome et al., 1991, fig.1-p.685
Paratype: Yun, 1981
Locus typicus: Timmermann brickyard near Esbeck, Westphalia, Germany
Stratum typiccum: 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.
Questionable tax. jr. synonym of Exochosphaeridium pseudhystrichodinium (Deflandre, 1937) Davey et al., 1969, according to Ziaja, 1989.
Holotype: Yun, 1981, pl.4, fig.12; Fensome et al., 1991, fig.1-p.685
Paratype: Yun, 1981
Locus typicus: Timmermann brickyard near Esbeck, Westphalia, Germany
Stratum typiccum: 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.