Calpionella is an extinct genus of calpionellid, a group of single-celled eukaryotes. Their fossils are found in rocks of Upper Jurassic to Lower Cretaceous age.
Etymology
The name is derived from Greek κάλπις, kálpis 'water jug'. == Biostratigraphic significance ==
Biostratigraphic significance
The first occurrence of the species Calpionella alpina marks the beginning of the Berriasian and thus Cretaceous. == Distribution ==