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Cordosphaeridium uncinispinosum
Cordosphaeridium uncinispinosum de Coninck, 1969
Now Operculodinium. Originally Cordosphaeridium. subsequently Cleistosphaeridium, thirdly (and now Operculodinium.
Stover and Evitt, 1978, considered this to be a problematic species of Cordosphaeridium.
Holotype: de Coninck, 1969, pl.9, figs.6-8
Age: Early Eocene
Original description (de Coninck, 1969):
Cordosphaeridium uncinispinosum DE CONINCK , 1967 . (Pl. IX, fig. G-8.)
J. DE CONINCK, 1967 , Nat. Wet. Tijdschr., 4 8 (1966), p. 226 .
Cordosphaeridium palmatum (WHITE, 1842) in D E CONINCK , 1965 , Mém. Ac. roy. Belg., Cl. Sc., cull. 8, 3 6 , fasc. 2 , p. 3 2 , pl. VI , fig. 8 et 1 0 .
Description [translation PKB 2024] . — -307 m. Preparation 4; broken piece of preparation. The organism consists of a more or less globular shell. There is no tab. An archaeopyle whose shape I cannot see is present. The wall is made up of two layers, the outer one of which is fibrous and gives rise to the long, fibrous and full processes. Their distal end is decorated with a rosette of small hooks, just like in C. microtriaina (KLUMPP, 1953). The length of the processes varies between one third and one half of the hull dimensions.
Body dimensions: approximately 80 µm by 70 µm
Process dimensions: between approximately 25 µm and 40 µm
Total span: between approximately 80 µm and 120 µm
Remarks . — These organisms are close to C. microtriaina. They differ mainly in their large size and proportions as well as the lower density of the processes. This species is absent in the base of the Ypresian deposits of Kallo. Some intermediates with C. microtriaina appear around -357.5 m and the species itself in the -307 m level.
Now Operculodinium. Originally Cordosphaeridium. subsequently Cleistosphaeridium, thirdly (and now Operculodinium.
Stover and Evitt, 1978, considered this to be a problematic species of Cordosphaeridium.
Holotype: de Coninck, 1969, pl.9, figs.6-8
Age: Early Eocene
Original description (de Coninck, 1969):
Cordosphaeridium uncinispinosum DE CONINCK , 1967 . (Pl. IX, fig. G-8.)
J. DE CONINCK, 1967 , Nat. Wet. Tijdschr., 4 8 (1966), p. 226 .
Cordosphaeridium palmatum (WHITE, 1842) in D E CONINCK , 1965 , Mém. Ac. roy. Belg., Cl. Sc., cull. 8, 3 6 , fasc. 2 , p. 3 2 , pl. VI , fig. 8 et 1 0 .
Description [translation PKB 2024] . — -307 m. Preparation 4; broken piece of preparation. The organism consists of a more or less globular shell. There is no tab. An archaeopyle whose shape I cannot see is present. The wall is made up of two layers, the outer one of which is fibrous and gives rise to the long, fibrous and full processes. Their distal end is decorated with a rosette of small hooks, just like in C. microtriaina (KLUMPP, 1953). The length of the processes varies between one third and one half of the hull dimensions.
Body dimensions: approximately 80 µm by 70 µm
Process dimensions: between approximately 25 µm and 40 µm
Total span: between approximately 80 µm and 120 µm
Remarks . — These organisms are close to C. microtriaina. They differ mainly in their large size and proportions as well as the lower density of the processes. This species is absent in the base of the Ypresian deposits of Kallo. Some intermediates with C. microtriaina appear around -357.5 m and the species itself in the -307 m level.