Back
Hafniasphaera hyalospinosa
Hafniasphaera hyalospinosa Hansen, 1977, p.14
Originally (and now) Hafniasphaera, subsequently Spiniferites. Williams et al. (1998, p.261) retained this species in Hafniasphaera.
Holotype: Hansen 1977, fig.18a
Locus typicus: Copenhagen, Denmark
Stratum typicum: Danian
Original description: Hansen, 1977, p. 14
Hafniasphaera gen. nov. with ovoid, thick-walled central body. Cyst wall contains
numerous evenly distributed 0.5-1.0 µm vesicles at the paraplate areas. Boundaries between paraplates indicated by weak alignment of vesicles, or by a weak bulge of the periphragm. Processes distally closed, centrally containing a variable number of vesicles generally larger than vesicles in the cyst wall. Simple processes unbranched, trifurcate, bifid. Composite processes ramifying in more complex ways.
Original description: Hansen, 1977, p. 14
Central body more or less translucent dependent on the density of the vesicles.
Paratabulation of plates 1"-3", 1"-6", 1c-6c, 2"""-6""", (1p), 1"""". Cingular paraplates very narrow. No sulcal paraplates visible. A notch in the lower left side of 2""" indicates the presence of Ip. Archaeopyle often enlarged. Processes solid (except for the vesicles). Simple processes subcircular in cross-section. Composite processes more irregular. Some processes provided with a basal cavity. Process material seems brighter than wall material. Number of vesicles in the processes varies greatly within the same specimen. Small processes may be free of vesicles, whereas large processes may contain 30 vesicles. A few specimens contain no vesicles in the processes at all. In general 5-20 vesicles are present in each process. Size of vesicles in processes varies greatly within the same specimen from 1/10 of the process diameter to more than average process diameter, which gives rise to balloon-like thickenings of the processes. Distally two processes may be interconnected by trabeculae (rare).
Originally (and now) Hafniasphaera, subsequently Spiniferites. Williams et al. (1998, p.261) retained this species in Hafniasphaera.
Holotype: Hansen 1977, fig.18a
Locus typicus: Copenhagen, Denmark
Stratum typicum: Danian
Original description: Hansen, 1977, p. 14
Hafniasphaera gen. nov. with ovoid, thick-walled central body. Cyst wall contains
numerous evenly distributed 0.5-1.0 µm vesicles at the paraplate areas. Boundaries between paraplates indicated by weak alignment of vesicles, or by a weak bulge of the periphragm. Processes distally closed, centrally containing a variable number of vesicles generally larger than vesicles in the cyst wall. Simple processes unbranched, trifurcate, bifid. Composite processes ramifying in more complex ways.
Original description: Hansen, 1977, p. 14
Central body more or less translucent dependent on the density of the vesicles.
Paratabulation of plates 1"-3", 1"-6", 1c-6c, 2"""-6""", (1p), 1"""". Cingular paraplates very narrow. No sulcal paraplates visible. A notch in the lower left side of 2""" indicates the presence of Ip. Archaeopyle often enlarged. Processes solid (except for the vesicles). Simple processes subcircular in cross-section. Composite processes more irregular. Some processes provided with a basal cavity. Process material seems brighter than wall material. Number of vesicles in the processes varies greatly within the same specimen. Small processes may be free of vesicles, whereas large processes may contain 30 vesicles. A few specimens contain no vesicles in the processes at all. In general 5-20 vesicles are present in each process. Size of vesicles in processes varies greatly within the same specimen from 1/10 of the process diameter to more than average process diameter, which gives rise to balloon-like thickenings of the processes. Distally two processes may be interconnected by trabeculae (rare).