Peristome: Difference between revisions
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The word '''peristome''' is derived from the [[Greek language|Greek]] ''peri'', meaning 'around' or 'about', and ''stoma'', 'mouth'. It is a term used to describe various structures in [[plant]]s and [[invertebrate]] animals, such as [[mollusc]]s, that surround an opening to an organ. |
The word '''peristome''' is derived from the [[Greek language|Greek]] ''peri'', meaning 'around' or 'about', and ''stoma'', 'mouth'. It is a term used to describe various structures in [[plant]]s and [[invertebrate]] animals, such as [[mollusc]]s, that surround an opening to an organ. |
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Peristome is |
Peristome is the margin of the [[Aperture (mollusc)|aperture]] of a [[gastropod shell]]. |
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In [[bryophyte]] [[moss]]es, the peristome is a specialized structure in the [[sporangium]] that allows for gradual [[spore]] discharge, instead of releasing them all at once. |
In [[bryophyte]] [[moss]]es, the peristome is a specialized structure in the [[sporangium]] that allows for gradual [[spore]] discharge, instead of releasing them all at once. |
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Revision as of 16:40, 29 July 2007
The word peristome is derived from the Greek peri, meaning 'around' or 'about', and stoma, 'mouth'. It is a term used to describe various structures in plants and invertebrate animals, such as molluscs, that surround an opening to an organ.
Peristome is the margin of the aperture of a gastropod shell.
In bryophyte mosses, the peristome is a specialized structure in the sporangium that allows for gradual spore discharge, instead of releasing them all at once.
In pitcher plants, the peristome is a reflexed ring (or partial ring) of tissue that surrounds the entrance to the digestive tube in these plants. It often (for example in Cephalotus) possesses sharp, overhanging 'teeth' which aid in prey retention. It is often studded with nectar secreting glands, hence its popular name, 'nectar roll'.