Large, narrow, spine-like nannofossil that tapers towards both ends and has a narrow central canal.
Rhabdolith with a tall, narrow, club-like (claviform) spine that is not as broad as the coccolith rim. The rim is usually relatively narrow and the outer cycle is significantly smaller the inner. Some specimens have a collar at the base of the spine.
Small rhabdolith with thin base and narrow spine.
Long, slender spine that tapers gradually and has a characteristic thickening at the broader end. The spine is birefringent when parallel with the polarising directions, has a narrow, axial canal and is typically seen with no basal coccolith.
Rhabdolith with a tall, narrow, styliform spine that tapers gradually to a point; the outer surface is smooth. The width of the spine is around half that of the coccolith but considerable taller (x 4-6). The rim is relatively broad and distinctly convex.
A rhabdolith-like nannofossil comprising a tapering spine-like structure with a narrow to broad central canal. No basal coccolith has yet been observed at the wider end although a distinct widening occurs there.
Rhabdolith with a tall, narrow, styliform spine that is narrow at its base, broadens slightly and then tapers to a point but is never as broad as the coccolith rim. The rim is relatively narrow with a bright inner cycle.
Long spine that tapers at both ends and displays a characteristic spiralling pattern in XPL. The spine has a narrow axial canal and is typically seen with no basal coccolith.
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