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   » » Wiki: Calpionellid
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Calpionellids are an extinct group of single celled organisms of uncertain affinities. Their fossils are found in marine rocks of to age.

(1989). 9780521367196, Cambridge University Press.
They were organisms with -shaped, tests that had a widespread distribution across the from the late to the early and were characterised by rapid evolution, and their abundant remains in deep sea sediments from this interval are important as they allow long distance correlation and precise dating.
(2025). 9788132239604, Springer India. .
Calpionellids were not confined to the Tethys, as they have also been found in the of northern , in what was then the southeastern Pacific. Calpionellids are divided into two main families, the Chitinoidellidae, which are the earliest members of the group, appearing in the mid Tithonian, characterised by lorica. Calpionellidae appear later, including widespread genera such as and , and have combined microgranular and lorica. A third family, the Semichitinoidellidae are sometimes recognised.


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

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