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Kallosphaeridium orchiesense
Kallosphaeridium orchiesense de Coninck, 1975, p.101–102, pl.18, figs.15–17. Emendation: Jan du Chêne et al., 1985a, p.12–13.
Holotype: de Coninck, 1975, pl.18, figs.15–17; Jan du Chêne et al., 1985a, pl.3, figs.8–13; text-figs.4A–B.
Age: Early Eocene (Ypresian)
Original description (DeConinck, 1975):
Kallosphaeridium orchiesense nov.sp. (Pl. 18, fig. 15-17)
Holotype: Orchies à - 6,6 m sous la surface. Préparation 1; coord. 25,7 - 116.
Diagnose: Le corps est plus ou moins globuleux. Sa paroi est grossièrement granulée et ornée de petits processus courts, et dont la base granuleuse s'élargit. Les processus se t e r ¬ minent en une pointe ou bien en un renflement arrondi. L'archaeopyle est apical et entour é de 6 plaques précingulaires que l'on reconnaît seulement par la présence de fentes dans la paroi. La série de 6 plaque s pré c i n g u 1 aires est interrompue par une étroite plaque ventrale à laquelle l ’opercule reste attaché.
Dimensions du corps: environ 60 µ.
Hauteur des processus: environ 2 à 3 µm.
Envergure totale: environ 65 µm.
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Jan de Chene 1985a, p. 12-13
The emended description below is based on a restudy of the holotype and on the original description (DE CONINCK, 1976a, p. 101-102). It differs from the original description by indicating that:
1. the wall is two-layered,
2. the ornamentation is punctoreticulate and clavate,
3. processes per se are lacking and
4. the archeopyle is type [4AI] @ or [SA] @ .
Emended Description: Jan de Chene 1985a, p. 12-13
Subspherical proximate cysts with a thin (about 0.5 Ám), homogeneous, untextured endophragm and a thicker (about 15 Ám), appressed periphragm periphragm has a loosely fibrous appearance and externally is puntoreticulate and bears numerous clavate projections (pl. 3, fig. 12 - 13). The clavae are approximately 2-3 Ám in height and have slightly swollen, rounded tips. Paratabulation is expressed solely by the principal and accessory archeopyle sutures which indicate an epicystal paratabulation of 4", la, 6" or 5", 6". In the precingular series, 2" is four-sided, whereas paraplates 1", 3"-6" are five-sided. Indications of hypocystal paratabulation, a paracingulum and a parasulcus are lacking. Archeopyle types [4AI]@ or [5A]@, isthmus narrow; operculum small relative to cyst diameter; OW/CD ratio = 0.33 to 0.37. Constituent paraplates not delineated on opercular surface. Cyst diameter between 45 and 65 Ám; 7 specimens measured.
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Holotype: de Coninck, 1975, pl.18, figs.15–17; Jan du Chêne et al., 1985a, pl.3, figs.8–13; text-figs.4A–B.
Age: Early Eocene (Ypresian)
Original description (DeConinck, 1975):
Kallosphaeridium orchiesense nov.sp. (Pl. 18, fig. 15-17)
Holotype: Orchies à - 6,6 m sous la surface. Préparation 1; coord. 25,7 - 116.
Diagnose: Le corps est plus ou moins globuleux. Sa paroi est grossièrement granulée et ornée de petits processus courts, et dont la base granuleuse s'élargit. Les processus se t e r ¬ minent en une pointe ou bien en un renflement arrondi. L'archaeopyle est apical et entour é de 6 plaques précingulaires que l'on reconnaît seulement par la présence de fentes dans la paroi. La série de 6 plaque s pré c i n g u 1 aires est interrompue par une étroite plaque ventrale à laquelle l ’opercule reste attaché.
Dimensions du corps: environ 60 µ.
Hauteur des processus: environ 2 à 3 µm.
Envergure totale: environ 65 µm.
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Jan de Chene 1985a, p. 12-13
The emended description below is based on a restudy of the holotype and on the original description (DE CONINCK, 1976a, p. 101-102). It differs from the original description by indicating that:
1. the wall is two-layered,
2. the ornamentation is punctoreticulate and clavate,
3. processes per se are lacking and
4. the archeopyle is type [4AI] @ or [SA] @ .
Emended Description: Jan de Chene 1985a, p. 12-13
Subspherical proximate cysts with a thin (about 0.5 Ám), homogeneous, untextured endophragm and a thicker (about 15 Ám), appressed periphragm periphragm has a loosely fibrous appearance and externally is puntoreticulate and bears numerous clavate projections (pl. 3, fig. 12 - 13). The clavae are approximately 2-3 Ám in height and have slightly swollen, rounded tips. Paratabulation is expressed solely by the principal and accessory archeopyle sutures which indicate an epicystal paratabulation of 4", la, 6" or 5", 6". In the precingular series, 2" is four-sided, whereas paraplates 1", 3"-6" are five-sided. Indications of hypocystal paratabulation, a paracingulum and a parasulcus are lacking. Archeopyle types [4AI]@ or [5A]@, isthmus narrow; operculum small relative to cyst diameter; OW/CD ratio = 0.33 to 0.37. Constituent paraplates not delineated on opercular surface. Cyst diameter between 45 and 65 Ám; 7 specimens measured.
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