Back
Kallosphaeridium capulatum
Kallosphaeridium capulatum Stover, 1977; emend. Jan du Chene et al., 1985
Holotype: Stover, 1977, pl.1, figs.12-13
Locus typicus: Corehole 5/5B, Blake Plateau, Western N Atlantic
Stratum typicum: Middle Oligocene
Original description: Stover, 1977, p. 74
Cysts are subspherical with numerous uniformly distributed granules on the thin, about 0.5 Ám, commonly folded autophragm. Archeopyle is apical, type Aa; principal archeopyle suture is zigzag, and generally long accessory sutures occur between precingular paraplates. Operculum is small relative to body diameter and attached to rest of the cyst by a narrow isthmus; constituent apical paraplates not differentiated on opercular surface. Paratabulation expressed by archeopyle and accessory sutures. No indications of paracingulum and parasulcus.
Overall size 46 to 56 Ám in diameter; granules less than 1 Ám in height and diameter, bases circular to elliptical.
Affinities: Stover, 1977, p. 74
Kallosphaeridium capulatum differs from K. biornatum in that the autophragm surface has only granules whereas theautophragm surface of K. biornatum is basically punctoreticulate with superimposed cones and spinules.
-------------------------------------------------------------------------------------------------------------------------------------------------
Jan du Chene et al. 1985a, p. 10-11
The emended description below differs from the original description (STOVER, 1977, p. 74) only in that archeopyle type is changed from Aa to [4AI] @ or l5Al@.
Emended Description: Jan du Chene et al. 1985a, p. 10-11
Suspherical proximate cysts with a thin (less than 1 Ám), commonly folded autophragm whose outer surface bears numerous, uniformly distributed granules which are less than Ám in height and diameter. The paratabulation is indicated by the principal and accessory archeopyle sutures; other indications of paratabulation are lacking including those of a paracingulum and a parasulcus. Archeopyle sutures and opercular outline indicate an epicystal paratabulation formula of 4", la, 6" or 5", 6". Archeopyle type [4AI]@ or [SA]@, isthmus narrow, operculum small, relative to cyst diameter; OW/CD ratio = 0.35 to 0.32. Constituent paraplates not delineated on opercular surface. Diameter, between 46 and 56 Ám; 4 of 11 specimens measured, unmeasured specimens are incomplete or complexly folded.
Holotype: Stover, 1977, pl.1, figs.12-13
Locus typicus: Corehole 5/5B, Blake Plateau, Western N Atlantic
Stratum typicum: Middle Oligocene
Original description: Stover, 1977, p. 74
Cysts are subspherical with numerous uniformly distributed granules on the thin, about 0.5 Ám, commonly folded autophragm. Archeopyle is apical, type Aa; principal archeopyle suture is zigzag, and generally long accessory sutures occur between precingular paraplates. Operculum is small relative to body diameter and attached to rest of the cyst by a narrow isthmus; constituent apical paraplates not differentiated on opercular surface. Paratabulation expressed by archeopyle and accessory sutures. No indications of paracingulum and parasulcus.
Overall size 46 to 56 Ám in diameter; granules less than 1 Ám in height and diameter, bases circular to elliptical.
Affinities: Stover, 1977, p. 74
Kallosphaeridium capulatum differs from K. biornatum in that the autophragm surface has only granules whereas theautophragm surface of K. biornatum is basically punctoreticulate with superimposed cones and spinules.
-------------------------------------------------------------------------------------------------------------------------------------------------
Jan du Chene et al. 1985a, p. 10-11
The emended description below differs from the original description (STOVER, 1977, p. 74) only in that archeopyle type is changed from Aa to [4AI] @ or l5Al@.
Emended Description: Jan du Chene et al. 1985a, p. 10-11
Suspherical proximate cysts with a thin (less than 1 Ám), commonly folded autophragm whose outer surface bears numerous, uniformly distributed granules which are less than Ám in height and diameter. The paratabulation is indicated by the principal and accessory archeopyle sutures; other indications of paratabulation are lacking including those of a paracingulum and a parasulcus. Archeopyle sutures and opercular outline indicate an epicystal paratabulation formula of 4", la, 6" or 5", 6". Archeopyle type [4AI]@ or [SA]@, isthmus narrow, operculum small, relative to cyst diameter; OW/CD ratio = 0.35 to 0.32. Constituent paraplates not delineated on opercular surface. Diameter, between 46 and 56 Ám; 4 of 11 specimens measured, unmeasured specimens are incomplete or complexly folded.