Nannotax Enabling nannofossil research

Description: Eight to ten near-parallel-sided rays with rounded to pointed tips that radiate with little free length from a large circular central area. May show inter-ray ridges, a low central boss, and the development of nodes towards the ray tips.

Remarks: Discoaster mediosus and Discoaster binodosus intergrade but can be distinguished as follows: D. mediosus usually has ten rays or more, with free rays less than half the length of the central area; D. binodosus usually has 8 rays with longer free length and prominent lateral nodes and pointed ray tips.

Range: NP7 to NP10.