''Calpionella'' is an extinct genus of

calpionellid Calpionellids are an extinct group of eukaryotic single celled organisms of uncertain affinities. Their fossils are found in marine rocks of Upper Jurassic to Lower Cretaceous age. They were planktonic organisms with urn-shaped, calcitic t ...

, a group of single celled

eukaryote The eukaryotes ( ) constitute the Domain (biology), domain of Eukaryota or Eukarya, organisms whose Cell (biology), cells have a membrane-bound cell nucleus, nucleus. All animals, plants, Fungus, fungi, seaweeds, and many unicellular organisms ...

s.''Calpionella''
at

Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr ...

.org Their fossils are found in rocks of Upper Jurassic to

Lower Cretaceous Lower may refer to: * ''Lower'' (album), 2025 album by Benjamin Booker * Lower (surname) * Lower Township, New Jersey *Lower Receiver (firearms) * Lower Wick Gloucestershire, England See also * Nizhny {{Disambiguation ...

age.

Etymology

The name is derived from the Greek "κάλπις", meaning "water jug".

Biostratigraphic significance

The first occurrence of the species ''Calpionella alpina'' marks the beginning of the

Berriasian In the geological timescale, the Berriasian is an age/ stage of the Early/Lower Cretaceous. It is the oldest subdivision in the entire Cretaceous. It has been taken to span the time between 143.1 ±0.6 Ma and 137.05 ± 0.2 (million years ago) ...

and thus

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

Distribution

Fossils of the genus have been found in: ;Jurassic * Guasasa Formation, Cuba * Stramberk Formation, Czech Republic ;Cretaceous * Puke, Albania * Argiles de Ghriss Formation, Algeria * Steinmühl Formation, Austria * Abenaki Formation, Nova Scotia, Canada * Guasasa Formation, Cuba * Lake Rożnów, Poland * Lapos Formation, Romania * Miravetes and Tollo Formations, Spain

References

{{Taxonbar, from=Q5023918 Alveolata genera Index fossils Late Jurassic first appearances Early Cretaceous extinctions Jurassic Cuba Cretaceous Cuba Fossils of Cuba Fossils of the Czech Republic Fossils of Albania Fossils of Algeria Cretaceous Austria Fossils of Austria Cretaceous Nova Scotia Fossils of Canada Fossils of Poland Cretaceous Romania Fossils of Romania Cretaceous Spain Fossils of Spain Fossil taxa described in 1902 Fossil protist genera