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Batiacasphaera gemmata
Batiacasphaera gemmata, Head et al., 1989
Holotype: Head et al., 1989, pl.9, figs.1-3
Locus typicus: Baffin Bay, N Atlantic
Statum typicum: Early Miocene
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Original description: [Head et al., 1989, p.488]:
Diagnosis:
Cyst spherical and has a hyaline autophragm with smooth to faintly scabrate surface bearing gemmae of variable size that are irregularly and sparsely distributed over all, or most of, the surface.
Archeopyle apical Type (4A), having a moderately angular principal suture. Accessory sutures may be developed. Operculum free.
Description:
The autophragm, including gemmae, is hyaline and does not take up the safranin-O used to stain residues in this study. Individual specimens bear a range of gemma sizes, often down to 0.5 µm or less. Distribution of gemmae is irregular and rather sparse, as illustrated specimens demonstrate, although this does not appear to reflect paratabulation. Gemmae may be loosely clustered and have an average density from up to seven or eight gemmae (of approximately 2-4 µm diameter) per 25 µm¦, although typically averages one to three per 25 µm¦, as for the holotype. No features reflecting paratabulation were observed other than the archeopyle.
Dimensions.
Holotype: Cyst diameter (excluding ornament), 34 µm, maximum diameter of gemmae, 2.8 µm.
Range in cyst diameter, 30 (34.5) 40 µm. Range in diameter of largest gemma, 1.4-3.0 µm. Wall thickness, about 1 µm. Ten specimens were measured.
Remarks:
No other species of Batiacasphaera is known to possess gemmate ornament.
Holotype: Head et al., 1989, pl.9, figs.1-3
Locus typicus: Baffin Bay, N Atlantic
Statum typicum: Early Miocene
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Original description: [Head et al., 1989, p.488]:
Diagnosis:
Cyst spherical and has a hyaline autophragm with smooth to faintly scabrate surface bearing gemmae of variable size that are irregularly and sparsely distributed over all, or most of, the surface.
Archeopyle apical Type (4A), having a moderately angular principal suture. Accessory sutures may be developed. Operculum free.
Description:
The autophragm, including gemmae, is hyaline and does not take up the safranin-O used to stain residues in this study. Individual specimens bear a range of gemma sizes, often down to 0.5 µm or less. Distribution of gemmae is irregular and rather sparse, as illustrated specimens demonstrate, although this does not appear to reflect paratabulation. Gemmae may be loosely clustered and have an average density from up to seven or eight gemmae (of approximately 2-4 µm diameter) per 25 µm¦, although typically averages one to three per 25 µm¦, as for the holotype. No features reflecting paratabulation were observed other than the archeopyle.
Dimensions.
Holotype: Cyst diameter (excluding ornament), 34 µm, maximum diameter of gemmae, 2.8 µm.
Range in cyst diameter, 30 (34.5) 40 µm. Range in diameter of largest gemma, 1.4-3.0 µm. Wall thickness, about 1 µm. Ten specimens were measured.
Remarks:
No other species of Batiacasphaera is known to possess gemmate ornament.