Hood

Holotype

 

Hyaline

A silica extension with the shape of a hood on the inside of a valve. It occurs only in some species of Planothidium where it partly covers the inside of the asymmetrical central area of the rapheless valve. See also rimmed depression.


Alternative Term

cavum

Several references, including Kingston 2003, use the Latin term "cavum" to describe this structure.

Citations

Kingston, J.C. (2003). Araphid and Monoraphid Diatoms. In: Freshwater Algae of North America. Ecology and Classification (J.D. Wehr and R.G. Sheath, eds). Elsevier Science pp. 595-636.