''Cassidulina'' may refer to:
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''Cassidulina'' (foraminifera), a genus in the family Cassidulinidae
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Cassidulina (echinoderms), a superfamily of sea urchins in the order
Cassiduloida
Cassiduloida is an order of sea urchins. The group was extremely diverse with many families and species during the Mesozoic
The Mesozoic Era is the Era (geology), era of Earth's Geologic time scale, geological history, lasting from about , com ...
{{taxonomy disambiguation