small Syracosphaera with flaring rim formed of clockwise-imbricate elements, low basal cycle forms proximal flange; central area with well-spaced lath cycle; low central spine sometimes present
Broadly elliptical with well-developed proximal and distal flanges. Central area floored by 2 irregular cycles of laths.
Small Syracosphaera with moderately flaring wall, lacking flanges, wall elements show distinct clockwise imbrication, central area with single cycle of robust laths.
Sub-circular with narrow rim but bright central lath cycle, thickening to form central mound
Small (ca 2µm) delicate species of Syracosphaera; narrow vertical wall; central area with two cycles of radial laths and low central spine on some specimens.
Small elliptical coccolith with birefringent inner cycle and non-birefringent outer cycle.
Small, elliptical, with weakly imbricate rim elements, no flanges, robust lath cycle
Small (3–4 µm), elliptical; rim narrow formed of sub-vertical elements with a distinct proximal flange; central-area wide spanned by a well-developed fragile lath cycle and a low central spine
Narrow rimmed coccolith with figure-of-eight outline (indentations on each side).
Very small (~2 µm) elliptical; rim thick, formed of elements showing a dextral obliquity; central area with distinct radial lath cycle and central boss
Medium sized, with narrow bicyclic rim (bright inner cycle, dark outer cycle) and wide central area.
Rim very narrow; rhomboidal central plate
Rim well-developed, wide lath cyle cycle, longitudinal bar
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