Okada & McIntyre 1977
After Young et al. 2003. BCs - distal flange narrow, with weak sutural ridges showing clockwise obliquity; laths broad, restricted at outer ends forming ring of pseudo-pores; axial structure-weak ridge formed from fusion of lath tips, without upgrowths.
CFCs - not differentiated.
XCs - conical (but usually flattened); rim elements L-shaped forming a proximally-directed wall. Broad lath cycle with sinistral obliquity (i.e. anti-clockwise in distal view). Central plate quadrate, formed of two large elements. Coccospheres 5-7 μm; BCs 3-3.5 μm; XCs 1-2.5 μm.
Sub-tropical (Findlay & Giraudeau, 2000).