Castanidium is a genus of cercozoans in the family Castanellidae.

Castanidium
Illustration from Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Part III, Ernst Haeckel (1834-1919), engravings by Adolf Giltsch (1852-1911), 1887. Plate 113. Castanellida.


Fig. 2. Castanidium moseleyi, n. sp., × 80
Fig. 5. Castanidium murrayi, n. sp., × 100
Fig. 7. Castanidium buchanani, n. sp., × 100

Scientific classification
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Castanidium

Haeckel, 1879
Species

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