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In zoology
Zoology

Zoology is the branch of biology concerned with the study of animals. The most common pronunciation of "zoology" is ; however, an alternative pronunciation is ....
, sessility is a characteristic of animal
Animal

Animals are a major group of multicellular, eukaryotic organisms of the Kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life....
s which are not able to move about. They are usually permanently attached to a solid substrate of some kind, such as a rock
Rock (geology)

In geology, rock is a naturally occurring solid aggregate of minerals and/or mineraloids.The Earth's outer solid layer, the lithosphere, is made of rock....
, or the hull
Hull (watercraft)

A hull is the watertight body of a ship or boat. It is a central concept in floating vessels as it provides the buoyancy that keeps the vessel from sinking....
 of a ship in the case of barnacle
Barnacle

A barnacle is a type of arthropod belonging to infraclass Cirripedia in the Subphylum Crustacean, and is hence distantly related to crabs and lobsters....
s. Coral
Coral

Corals are marine organisms from the class Anthozoa and exist as small sea anemone?like polyps, typically in colonies of many identical individuals....
s lay down their own substrate.

Sessile animals typically have a motile phase in their development. Sponge
Sea sponge

The sponges or poriferans are animals of the phylum Porifera . Their bodies consist of an outer thin layer of cells, the pinacoderm and an inner mass of cells and skeletal elements, the choanoderm....
s have a motile larval stage, which becomes sessile at maturity. In contrast, many jellyfish
Jellyfish

Jellyfish are free-swimming members of the phylum Cnidaria. They have several different morphologies that represent several different cnidarian classes including the Scyphozoa , Staurozoa , Cubozoa , and Hydrozoa ....
 develop as sessile polyp
Polyp

In zoology, a polyp is one of two forms of individuals found in many species of cnidarians. The two are the polyp or hydroid and the medusa . Polyps are approximately cylindrical, elongated on the axis of the body....
s early in their life cycle.






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In zoology
Zoology

Zoology is the branch of biology concerned with the study of animals. The most common pronunciation of "zoology" is ; however, an alternative pronunciation is ....
, sessility is a characteristic of animal
Animal

Animals are a major group of multicellular, eukaryotic organisms of the Kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life....
s which are not able to move about. They are usually permanently attached to a solid substrate of some kind, such as a rock
Rock (geology)

In geology, rock is a naturally occurring solid aggregate of minerals and/or mineraloids.The Earth's outer solid layer, the lithosphere, is made of rock....
, or the hull
Hull (watercraft)

A hull is the watertight body of a ship or boat. It is a central concept in floating vessels as it provides the buoyancy that keeps the vessel from sinking....
 of a ship in the case of barnacle
Barnacle

A barnacle is a type of arthropod belonging to infraclass Cirripedia in the Subphylum Crustacean, and is hence distantly related to crabs and lobsters....
s. Coral
Coral

Corals are marine organisms from the class Anthozoa and exist as small sea anemone?like polyps, typically in colonies of many identical individuals....
s lay down their own substrate.

Sessile animals typically have a motile phase in their development. Sponge
Sea sponge

The sponges or poriferans are animals of the phylum Porifera . Their bodies consist of an outer thin layer of cells, the pinacoderm and an inner mass of cells and skeletal elements, the choanoderm....
s have a motile larval stage, which becomes sessile at maturity. In contrast, many jellyfish
Jellyfish

Jellyfish are free-swimming members of the phylum Cnidaria. They have several different morphologies that represent several different cnidarian classes including the Scyphozoa , Staurozoa , Cubozoa , and Hydrozoa ....
 develop as sessile polyp
Polyp

In zoology, a polyp is one of two forms of individuals found in many species of cnidarians. The two are the polyp or hydroid and the medusa . Polyps are approximately cylindrical, elongated on the axis of the body....
s early in their life cycle. Many sessile animals, including sponges, coral
Coral

Corals are marine organisms from the class Anthozoa and exist as small sea anemone?like polyps, typically in colonies of many identical individuals....
s, and hydra
Hydra (genus)

Hydra is a genus of simple fresh-water animals possessing symmetry #Radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrozoa....
, are capable of asexual reproduction
Asexual reproduction

Asexual reproduction is reproduction which does not involve meiosis, ploidy reduction, or fertilization. Only one parent is involved in asexual reproduction....
 in situ by a process of budding
Budding

Budding is the formation of a new organism by the protrusion of part of another organism. This is very common in plants and fungi, but may be found in some animals as well, such as the Hydra ....
.

Clumping is a behavior in an animal, usually sessile, in which individuals of a particular species group close to one another for beneficial purposes.