Calpionellites

Calpionellites is an extinct genus of single celled eukaryotes. Their fossils are found in rocks dating to the Valanginian stage of the Early Cretaceous.
Biostratigraphic significance.
The first occurrence of the species "Calpionellites darderi" marks the beginning of the Valanginian and thus end of the Berriasian.
Distribution.
Fossils of the genus have been found in: