epiphragm


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epiphragm

[′ep·ə‚fram]
(botany)
A membrane covering the aperture of the capsule in certain mosses.
(invertebrate zoology)
A membranous or calcareous partition that covers the aperture of certain hibernating land snails.
References in periodicals archive ?
The reason for lack of an epiphragm requires more research because it could be an alternate system to close the shell aperture, as in members of the genera Pararhytida and Rhytidopsis (Charopidae), which have pseudo-opercules (Solem et al.
For example, during estivation, the mouth of the shell of desert snails is closed by a thick epiphragm of calcified slime, which reduces water loss by evaporation so much that some desert snails can remain dormant for five years and revive when wetted.
Therefore, during dry and hot spells, they withdraw into their shells, conserve water by sealing their shell aperture with a calcareous epiphragms and reduce their mobility, reproduction and growth [1].
Marking was carried out during dry days, when the snails were inactive, having stuck their apertures to the rocks by means of epiphragms (tests at other sites within the same area confirmed that virtually all snails found in this position were alive).