(Manton, J. Sutherl. & Oates) H.A. Thomsen et al. (1991b: 640-641, figs 5-7, 10).
(original name of HET phase): Papposphaera sarion H.A.Thomsen (1981)
Turrisphaera arctica Manton, J.Sutherl. & Oates (Manton et al., 1976c: 188–189, pl. 4, figs 24–34)
Coccospheres spherical, c. 7 μm; coccoliths 1.5–2 μm long; central area with an axial cross; process 2–4 μm high, ending distally in 4 subparallel crystallites, each c. 1 μm long; calyx reduced to 4 subparallel rods.
Genus description: Heterococcospheres monomorphic or variable; coccoliths elliptical; outer rim elements with angular tops forming a serrated margin. Species separated mainly on central area and process structures.
64º51'S 46º05'W, Thomsen et al. (1988)
Family Papposphaeraceae description: Diploid phase motile; coccospheres covered in pappoliths. A central process is often prominent. Each pappolith is constructed of a rim of two lath types, one small and confined to the proximal part of the wall, the other vertically expanded; central area with variable structures. Haploid phase motile, with holococcoliths typically with tower-like forms.