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Batiacasphaera curiosa
Batiacasphaera curiosa, (Bujak, 1984), Jan du Chêne et al., 1985
Originally Kallosphaeridium, subsequently (and now) Batiacasphaera.
Holotype: Bujak, 1984, pl. 2, fig. 17-20
Locus typicus: Aleutian Abyssal Plain, northern North Pacific
Stratum typicum: Middle to Late Eocene
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Original description as Kallosphaeridium curiosum: [Bujak, 1984, p. 188]:
Diagnosis:
Cyst subspherical to ovoidal, sometimes with poorly developed lateral and antapical lobes.
Periphragm granulate with a few randomly distributed longer spines up to about 6 µm in length.
Cingulum and sulcus poorly defined or absent.
Archeopyle apical tAa, remaining attached to the cyst along the "tAa" and possibly also the 4"/6" boundary.
Description:
The cyst is subspherical to ovoidal, sometimes with two lateral and two antapical lobes that are poorly developed. The periphragm has a dense covering of granules or very short spines, always with a few distinctly longer spines-up to 6 µm in length. These longer spines, which appear to be randomly distributed, are solid and slender, with flared distal terminations. On some specimens the presence of a cingulum is suggested by a slight indentation and fewer granules. The adcingular margins may also be marked by slight thickenings of the wall. The archeopyle comprises the four apical plates and it remains attached ventrally to the cyst. The fourth apical plate appears to contact the sixth precingular so that opercular attachment would be along the boundaries 1"/5a and 4"/6".
Originally Kallosphaeridium, subsequently (and now) Batiacasphaera.
Holotype: Bujak, 1984, pl. 2, fig. 17-20
Locus typicus: Aleutian Abyssal Plain, northern North Pacific
Stratum typicum: Middle to Late Eocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Kallosphaeridium curiosum: [Bujak, 1984, p. 188]:
Diagnosis:
Cyst subspherical to ovoidal, sometimes with poorly developed lateral and antapical lobes.
Periphragm granulate with a few randomly distributed longer spines up to about 6 µm in length.
Cingulum and sulcus poorly defined or absent.
Archeopyle apical tAa, remaining attached to the cyst along the "tAa" and possibly also the 4"/6" boundary.
Description:
The cyst is subspherical to ovoidal, sometimes with two lateral and two antapical lobes that are poorly developed. The periphragm has a dense covering of granules or very short spines, always with a few distinctly longer spines-up to 6 µm in length. These longer spines, which appear to be randomly distributed, are solid and slender, with flared distal terminations. On some specimens the presence of a cingulum is suggested by a slight indentation and fewer granules. The adcingular margins may also be marked by slight thickenings of the wall. The archeopyle comprises the four apical plates and it remains attached ventrally to the cyst. The fourth apical plate appears to contact the sixth precingular so that opercular attachment would be along the boundaries 1"/5a and 4"/6".