Seta
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In zoology, a seta (pl. setae) is a stiff hair, bristle, or bristle-like process, especially those of invertebrates.
- Setae help earthworms attach to the surface and prevent backsliding during peristaltic motion. These hairs are what make it difficult to pull a worm straight from the ground.
- Setae on the legs of krill help them to gather phytoplankton.
- Setae on their footpads are responsible for the gecko's ability to cling to vertical surfaces.
In botany, "seta" refers to the stalk supporting the capsule of a moss or a liverwort.
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de:Setaeo:Ĥeto fr:Seta hu:Szeta (biológia) nl:Seta pl:SetaSeta Expanded information
Seta refers to the stalk of a moss or liverwort sporophyte which is essential for survival. Hornworts and liverworts seta are borne on the gametophytes which supply the sporophytes with nutrition. (1) A short foot at the bottom of the stalk is embedded in the gametophyte tissue and cells of the foot and the adjoining gametophyte exchange materials. (1) The sporangia( capsules ) can take from 6 to 18 months to mature in temperate species and are elevated on a seta into the air. (1) This increases efficiency of spore dispersal. (1) Setae may reach 15 to 20 centimeters high in a some species, but may be very short or absent in other species. (1)
1. Raven, P. H., Evert, R. F., Eichhorn, S. E., (2005). Biology of Plants (7th ed.). W.H. Freeman and Company
