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Batiacasphaera deheinzelinii
Batiacasphaera deheinzelinii, Louwye, 1999, p.117, pl.2, figs.10-13; pl.3, figs.1-7.
Holotype: Louwye, 1999, pl.2, figs.10-12.
Type locality: Retie (Antwerp province, Belgium), well no. 31W243 of the Geological Survey of Belgium, 80.5 m below core top.
Type stratum: Diest Formation, Upper Miocene.
Occurrence: Upper Miocene (Diest Formation) of northern Belgium (Louwye, 1999).
Age: Late Miocene.
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Original description: [Louwye, 1999]:
Diagnosis:
Small, autophragmal cyst with a spherical central body. The thin autophragm is densely covered with short, solid and acuminate hairs.
Archeopyle apical (type tA), principal archeopyle suture with low angularity, operculum free.
Description:
The hyaline cyst wall has a thickness of less than 0.3 µm. The distribution of the solid hairs is nontabular and appears evenly spaced. The average distance between the hairs is 1 µm. The bases of the hairlike processes are slightly widened. No morphological variation of the simple, acuminate processes was noted. The archeopyle is generally the only indication of tabulation, although minute accessory archeopyle sutures between precingular plates have been observed on a few specimens.
Dimensions:
Holotype: diameter central body, 27 µm; length of hairs, up to 3.5 µm.
Range: diameter central body, 23(27)30 µm; length of hairs, 2–4.5 µm. Number of specimens measured: 19.
Affinities/Comparison:
This species differs from Batiacasphaera hirsuta Stover, 1977 in its much smaller size (23–30 µm vs. 41–49 µm) and the less angular archeopyle, although the general appearance of the cyst and the distribution of the processes are much alike. Batiacasphaera? sp. 1 Head et al., 1989a from the Middle Miocene of Baffin Bay could be conspecific when considering the general appearance, size and ornamentation. However, the archeopyle type of Batiacasphaera? sp. 1 Head et al., 1989a is uncertain. Batiacasphaera? sp. 1 Head et al., 1989a has also been recorded from the mid-Pliocene of eastern England (as Batiacasphaera? sp. in Head, 1997).
Holotype: Louwye, 1999, pl.2, figs.10-12.
Type locality: Retie (Antwerp province, Belgium), well no. 31W243 of the Geological Survey of Belgium, 80.5 m below core top.
Type stratum: Diest Formation, Upper Miocene.
Occurrence: Upper Miocene (Diest Formation) of northern Belgium (Louwye, 1999).
Age: Late Miocene.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Louwye, 1999]:
Diagnosis:
Small, autophragmal cyst with a spherical central body. The thin autophragm is densely covered with short, solid and acuminate hairs.
Archeopyle apical (type tA), principal archeopyle suture with low angularity, operculum free.
Description:
The hyaline cyst wall has a thickness of less than 0.3 µm. The distribution of the solid hairs is nontabular and appears evenly spaced. The average distance between the hairs is 1 µm. The bases of the hairlike processes are slightly widened. No morphological variation of the simple, acuminate processes was noted. The archeopyle is generally the only indication of tabulation, although minute accessory archeopyle sutures between precingular plates have been observed on a few specimens.
Dimensions:
Holotype: diameter central body, 27 µm; length of hairs, up to 3.5 µm.
Range: diameter central body, 23(27)30 µm; length of hairs, 2–4.5 µm. Number of specimens measured: 19.
Affinities/Comparison:
This species differs from Batiacasphaera hirsuta Stover, 1977 in its much smaller size (23–30 µm vs. 41–49 µm) and the less angular archeopyle, although the general appearance of the cyst and the distribution of the processes are much alike. Batiacasphaera? sp. 1 Head et al., 1989a from the Middle Miocene of Baffin Bay could be conspecific when considering the general appearance, size and ornamentation. However, the archeopyle type of Batiacasphaera? sp. 1 Head et al., 1989a is uncertain. Batiacasphaera? sp. 1 Head et al., 1989a has also been recorded from the mid-Pliocene of eastern England (as Batiacasphaera? sp. in Head, 1997).