Ahmuellerella limbitenuis Reinhardt, 1964
Actinozygus Gartner, 1968
In plan view under cross-polarised light, the wall and the proto inner wall remain in constant extinction, whereas the central structures exhibit interference colours.
Loxoliths are characterised by a single wall, associated with a proto inner wall, and by central structures supporting a distal process with a stellate calix. In Amaurolithus octoradiatus, the central axial cross consists of four paired arms diverging from the centre towards the wall. In contrast, Amaurolithus regularis possesses eight equally spaced radiating paired arms that collectively completely cover the central area.
Gartner, S., 1968. Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles 48 (Protista 1), 1-56.
Reinhardt, P. 1964. Einige Kalkflagellaten-Gattungen (Coccolithophoriden, Coccolithineen) aus dem Mesozoikum Deutschlands. - Monatsberichteder Deutschen Akademieder Wissenschaftenzu Berlin. 6: 749-759.