Watznaueria angustoralis Reinhardt, 1964
Colvillea Black 1964
Caterella Black, 1971
Calolithus Noël, 1965
Maslovella Tappan & Loeblich 1966
Margolatus Forchheimer, 1972
Coptolithus Black, 1973
Actinosphaera Noël,1965
Optical Properties: Except for the outer tube cycle, all components exhibit inclined extinction and length-fast (-) elongation in the plan view. The outer tube cycle is in constant extinction because the optic axis is vertical relative to the microscope stage in the plan view.
The subcircular to elliptical placolith comprises single-tiered distal and proximal shields, a double-tube cycle, and a closed or open central area without bar or cross structures. Watznaueria is distinguished from Cyclagelosphaera by its elliptical shape and from Lotharingius and Ellipsagelosphaera by lacking cross structures or disjunct bars, respectively, in the central area.
Black, M. 1964. Cretaceous and Tertiary coccoliths from Atlantic seamounts. Palaeontology 7: 306-316.
Black, M. 1971a. Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society 38: 381-424.
Black, M. 1973. British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph 127: 49-112.
Forchheimer, S. 1972. Scanning electron microscope studies of Cretaceous coccoliths from the Köpingsberg Borehole No. 1, SE Sweden. Sveriges Geologiska Undersökning, Series C. #668, 65: 1-141.
Loeblich, A. R. & Tappan, H. 1966. Annotated index and bibliography of the calcareous nannoplankton. Phycologia. 5: 81-216.
Noël, D. 1965. Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-129.
Reinhardt, P. 1964. Einige Kalkflagellaten-Gattungen (Coccolithophoriden, Coccolithineen) aus dem Mesozoikum Deutschlands. - Monatsberichteder Deutschen Akademieder Wissenschaftenzu Berlin. 6: 749-759.