Broinsonia dentata Bukry, 1969
Aspitolithus signatus Noël, 1969, Invalid according to ICBN Art. 40.3, (it has two holotypes)
Broinsonia's species have an axial cross with lateral bars [only visible in exceptionally well-preserved specimens] and a relatively small central opening. The axial cross is bulkier than other species. The arms of the axial cross have two helves visible at 45° under polarized light. The fluted wide tube cycle is strongly birefringent together with an axial cross whilst the narrow distal shield is dimmer.
Bukry, D., (1969): Upper Cretaceous coccoliths from Texas and Europe. - The University of Kansas Paleontological Contributions, Article 51 (Protista 2): 1-79.
Noël, D., (1969): Arkhangelskiella (coccolithes Crétacés) et formes affines du Bassin de Paris. - Revue de Micropaleontologie, 11: 191-204.
Lake Vaxahacie, Ellis County, Texas, USA