CATALOG OF ORIGINAL DESCRIPTIONS: Stylosphaera coronata macrosphaera Nishimura 1992
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Original Description Shell consists of two shells; one outer and one inner shell. Outer shell globular, quite large, thick-walled, smooth-surfaced with rosette-shaped pores regular in size and form. Inner shell bit pear-shaped, delicate. Polar spines three-bladed in cross-section, dissimilar in size; one very short, the other longer, slightly curved. Some specimens often have short spines in the equatorial plane. Size: (Based on 15 specimens) Diameter lengthwise 112-140 µ, at equator 110-135 µ, of inner shell 38-50 µ. Etymology: macrosphaerais derived from the Latin meaning large sphere. Extra details from original publication Distinguishing characters: This form is distinguished from Stylosphaera coronata sabaca Sanfilippo and Riedel (1973, p.521, pl. 1, figs. 20-22; pl. 25, figs. 9, 10) by having a single outer shell and short polar spines. This subspecies occurs commonly in the lower part of the examined section, and decreases in the upper part of the section.
References:
Nishimura, A. (1992). Paleocene radiolarian biostratigraphy in the northeast Atlantic at Site 384, Leg 43, of the Deep Sea Drilling Project. Micropaleontology. 38(4): 317-362. gs
Stylosphaera coronata macrosphaera compiled by the radiolaria@mikrotax project teamviewed: 24-6-2025
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