Definition of Periostraca. Meaning of Periostraca. Synonyms of Periostraca

Here you will find one or more explanations in English for the word Periostraca. Also in the bottom left of the page several parts of wikipedia pages related to the word Periostraca and, of course, Periostraca synonyms and on the right images related to the word Periostraca.

Definition of Periostraca

Periostraca
Periostracum Per`i*os"tra*cum, n.; pl. Periostraca. [NL., fr. Gr. ? around + ? shell of a testacean.] (Zo["o]l.) A chitinous membrane covering the exterior of many shells; -- called also epidermis.

Meaning of Periostraca from wikipedia

- mantle penetrate through the mineralized layers of the valves into the periostraca. The function of these diverticula is uncertain and it is suggested that...
- either thick calcite s**** and skeletons, were infaunal and/or had thick periostraca, or had an inner s**** of aragonite and an outer s**** of calcite. This...
- The whorls are largely in contact and united well together, though the periostraca is continuous between them. The large aperture forms more than a half-circle...