Cyclagelosphaera - a Mesozoic coccolith showing the typical placolith morphology of two shields connected by a tube. Left coccolith, with two segments removed. Right two segmentsRed - R-units, crystals with with sub-radial c-axes.
Green - V-units, crystals with with sub-vertical c-axes.
Watznaueria has identical structure but it is elliptical.
