From Frustule
| Calyptra |
Derived from the Greek word kalypter, meaning covering or sheath, this term refers to the cylindrical siliceous envelope that connects the epivalve with the infundibulum and hides the hypovalve in some fossil diatom resting spores. The calyptra can bear a diverse assortment of ornamentation that appears to be species diagnostic. The calyptra is supported on the inside by mantle costae and fala of the hypovalve. A similar cylindrical sheath occurs in the resting spores of some modern diatoms of the genera Chaetoceros and Rhizosolenia.
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References
- Harwood, D.M., and Gersonde, R., 1990, Lower Creataceous diatoms from ODP leg 113 site 693 (Weddell Sea). Part 2: Resting spores, chyrsophycean cysts, an endoskeletal dinoflagellate, and notes on the origin of diatoms. In Barker, P.F., Kennett, J.P., et al., Proc. ODP, Sci. Results, 113: College Station, TX (Ocean Drilling Program), 365–402. doi:10.2973/odp.proc.sr.113.127.1990
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