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{{wiktionary|sessile}}
'''Sessility''', or '''sessile''', may refer to:
 
* [[Sessility (motility)]], organisms which are not able to move about
'''Sessile''' is a term in [[biology]] with two distinct meanings:
* [[Sessility (botany)]], flowers or leaves that grow directly from the stem or peduncle of a plant
 
* [[Sessility (medicine)]], tumors and polyps that lack a stalk
== In botany ==
* Sessility (in crystallography), [[dislocation]] that is not able to move in the slip plane (as opposed to glissile)
In [[botany]], '''sessile''' means "without a [[Plant stem|stalk]]", as in flowers (pedicel) or leaves ([[petiole (botany)|petiole]]) that grow directly from the [[Plant stem|stem]] or [[Peduncle (botany)|Peduncle]]; however, in [[limnology]], sessile vegetation are any [[organism]]s anchored to the [[benthic]] environment.
 
== In zoology ==
In [[zoology]] sessile means "simpel animal", '''sessile''' [[animal]]s are those which are not able to move about. They are usually permanently attached to a solid [[Wiktionary:substrate|substrate]] of some kind, such as a [[rock (geology)|rock]], or the [[Hull (watercraft)|hull]] of a ship in the case of [[barnacle]]s. [[Coral]]s lay down their own substrate.
 
Sessile animals typically have a [[motile]] phase in their development. [[Sea sponge|Sponge]]s have a motile [[larval]] stage, which becomes sessile at maturity. In contrast, many [[jellyfish]] develop as sessile [[polyp]]s early in their life cycle. Many sessile animals, including sponges, [[coral]]s, and [[hydra (genus)|hydra]], are capable of [[asexual reproduction]] ''in situ'' by a process of [[budding]].
 
 
== Sessile animals ==
 
Sponges
Most of the 7000 spices of sponges are marine animals; only about 50 spices live in the fresh water. Sponges are sessile animals that come in a wide variety of sizes and shapes that are adapted to differnt movement patterns of water.
Sponges reproduce both sexually and asexually. In most species, a singel individual produces both egg and sperm, but individuals do not self-fertilize. Water currents carry sperm from one individual to another. Asexual reproduction is by budding and fragmentation. Scientists at the Norwegian university U.I.O, have results from experiments that show that over 75% of the sponges reproduce asexually.
 
 
'''Clumping''' is a behavior in an animal, usually sessile, in which individuals of a particular species group close to one another for beneficial purposes. kate
 
==See also==
* [[Sedentism]], in cultural anthropology, the practice of living in one place for a long time
* [[Sessile oak]]
 
[[Category:Biology]]
[[Category:Locomotion]]
 
{{disambiguation}}
[[de:Sessile Tiere]]
[[it:Sessilità]]
[[simple:Sessile]]
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