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Name derivation:

"Little bell" -- Bell Kodon- little -ella

 

Classification:

Codonella Haeckel, 1873

Order Tintinnida; Family Codonellidae

At least 18 species are recognized

 

Morphology:

Unicells with a lorica rounded basally and flared outward at the apical end.

Composition of the lorica is diverse, perhaps species specific.  Some are organic secretions described as chitinous.  Others have agglutinations of various particles varying from calcareous scales from coccoliths, to diatom frustules, or silicaceous chips.  Apparently a sticky organic substrate is secreted from the mouth, flows backward along the outside of the cell, picks up various particles that become embedded, then harden against the cell (Tappan and Loeblich 1968).

Similar genera:

Habitat:

Freshwater and marine in distribution.

 

References:

Tappan, H., and A.R. Loeblish Jr.  1968.  Lorica composition of modern and fossil Tintinnida (Ciliate Protozoa), systematic, geologic distribution, and some new Tertiary taxa.  Journal of Paleontology 42(16):1378-1394.