(Kamptner 1941) Okada & McIntyre 1977 (= S. sp. type A of Kleijne 1991, 1993)
After Young et al. 2003. Coccosphere consistently ovoid / egg shaped (5-7 μm).
XCs - broadly elliptical (1.8 - 2.2 μm); broad rim; slightly vaulted central part formed of laths showing dextral obliquity. Delicate, not easily seen.
BCs - long elliptical to oblong (1-2 μm); wall flat topped, not strongly flaring; central area vaulted into whaleback, radial cycle only; axial structure - weak ridge formed by fusion of lath tips.
CFCs - with low spines (0.1-0.2 μm) high.
Tropical - transitional (Findlay & Giraudeau, 2000).
HOL planar form, never described as a separate species (Kleijne 1991; Cros et al. 2000).