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Hafniasphaera cryptovesiculata
Hafniasphaera cryptovesiculata Hansen, 1977, p.14-15
Originally (and now) Hafniasphaera, subsequently Spiniferites. Williams et al. (1998, p.261) retained this species in Hafniasphaera.
Holotype: Hansen, 1977, fig.18c, e-f
Locus typicus: Tuba 13 well, Copenhagen, Denmark
Stratum typicum: Danian
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Hafniasphaera cryptovesiculata Hansen, 1977, has a subspherical, thick-walled central body with numerous, evenly distributed vesicles with a diameter of 0.5 µm or less. Boundaries between paraplates clearly marked by folds or periphragm. Processes strong, solid, Y-shaped in cross-section, trifurcate, bifid. If present, the vesicles in the processes generally are smaller than those of the central body. Vesicles are most abundant in the inner part of the cyst wall. Hafniasphaera hyalospinosa has simple and complex processes. The processes are distally closed, centrally containing a variable number of vesicles generally larger than vesicles in the cyst wall. Size: diameter of central body 80-84 µm, overall diameter 120-140 µm.
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Original diagnosis: Hansen, 1977, p.14
Hafniasphaera with subspherical, thickwalled central body provided with numerous evenly distributed vesicles with a diameter of 0.5 Ám or less. Boundaries between paraplates clearly marked by folds of periphragm. Processes strong, solid, Yshaped in cross-section, trifurcate, bifid. If present the vesicles in the processes generally are smaller than those of the central body.
Description: Hansen, 1977, p.14
Central body with a clear paratabulation of plates 1'-4', 1"-6", 1c-6c, 1'''-6''', ps, 1p, 1''''. Paraplate 1''' is very little, 4' is situated above parasulcus, between 1" and 5". Paracingulum is rather narrow. Vesicles are most abundant in the inner part of the cyst wall (endophragm). The vesiculation of the outer layer and the processes (periphragm) varies greatly from absent to almost as dense as in the endophragm. Processes often provided with a basal cavity with the shape of a tetrahedron. Sutural processes have not been observed.
Dimensions: Central body: Short diameter 76-88µm, average 84.6 µm. Long diameter 80-100 µm, average 88.3 µm. Overall diameter: Short diameter 108-142 µm, average 124.0 µm. Long diameter 120-146 µm, average 130.7 µm.
Originally (and now) Hafniasphaera, subsequently Spiniferites. Williams et al. (1998, p.261) retained this species in Hafniasphaera.
Holotype: Hansen, 1977, fig.18c, e-f
Locus typicus: Tuba 13 well, Copenhagen, Denmark
Stratum typicum: Danian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Hafniasphaera cryptovesiculata Hansen, 1977, has a subspherical, thick-walled central body with numerous, evenly distributed vesicles with a diameter of 0.5 µm or less. Boundaries between paraplates clearly marked by folds or periphragm. Processes strong, solid, Y-shaped in cross-section, trifurcate, bifid. If present, the vesicles in the processes generally are smaller than those of the central body. Vesicles are most abundant in the inner part of the cyst wall. Hafniasphaera hyalospinosa has simple and complex processes. The processes are distally closed, centrally containing a variable number of vesicles generally larger than vesicles in the cyst wall. Size: diameter of central body 80-84 µm, overall diameter 120-140 µm.
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Original diagnosis: Hansen, 1977, p.14
Hafniasphaera with subspherical, thickwalled central body provided with numerous evenly distributed vesicles with a diameter of 0.5 Ám or less. Boundaries between paraplates clearly marked by folds of periphragm. Processes strong, solid, Yshaped in cross-section, trifurcate, bifid. If present the vesicles in the processes generally are smaller than those of the central body.
Description: Hansen, 1977, p.14
Central body with a clear paratabulation of plates 1'-4', 1"-6", 1c-6c, 1'''-6''', ps, 1p, 1''''. Paraplate 1''' is very little, 4' is situated above parasulcus, between 1" and 5". Paracingulum is rather narrow. Vesicles are most abundant in the inner part of the cyst wall (endophragm). The vesiculation of the outer layer and the processes (periphragm) varies greatly from absent to almost as dense as in the endophragm. Processes often provided with a basal cavity with the shape of a tetrahedron. Sutural processes have not been observed.
Dimensions: Central body: Short diameter 76-88µm, average 84.6 µm. Long diameter 80-100 µm, average 88.3 µm. Overall diameter: Short diameter 108-142 µm, average 124.0 µm. Long diameter 120-146 µm, average 130.7 µm.