Gaarder, in Gaarder & Hasle 1971 ex Jordan & Green 1994.
After Young et al. 2003. BCs - with narrow distal flange; flanges well-separated by vertical sided tube; laths well-separated; low axial ridge formed of one or two laths. Short teeth protruding over central area from distal flange occur in some specimens.
CFCs - with tall spine, quadrate section, blunt end.
Coccospheres 5-20 μm; BCs 2-4 μm.
Tropical - transitional (Findlay & Giraudeau, 2000).