Sessile is a term in biology with two distinct meanings:
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In botany and medicine
In botany, sessile means "without a stalk", as in flowers (pedicel) or leaves (petiole) that grow directly from the stem or Peduncle; however, in limnology, sessile vegetation are any organisms anchored to the benthic environment. Foundations of modern biology There are five unifying principles Botany, plant science(s, phytology, or plant biology is a branch of Biology and is the scientific study of plant Life A stem is one of two main structural axes of a Vascular plant. In Botany, the petiole is the small stalk attaching the Leaf blade to the stem. A stem is one of two main structural axes of a Vascular plant. In Botany, a peduncle is a stalk supporting an Inflorescence, or after Fecundation a fruit Limnology (from Greek Λίμνη limne, "lake" and λόγος logos, "knowledge" is the division of Hydrology that studies inland The benthic zone is the ecological region at the lowest level of a Body of water such as an Ocean or a Lake, including the sediment surface and some sub-surface The term is also used in medicine to describe tumors and polyps that lack a stalk, as opposed to those that are pedunculated. Medicine is the art and science of healing It encompasses a range of Health care practices evolved to maintain and restore Human Health by the See also Cancer A tumor or tumour is the name for a swelling or lesion formed by an abnormal growth of cells (termed neoplastic A polyp is an abnormal growth of tissue ( Tumor) projecting from a Mucous membrane. Pedunculated is a medical term that is used to describe having or supported on a peduncle which is a stalk
In zoology
In zoology sessile animals are those which are not able to move about. Zoology (from Greek ζῷον, zoon, "animal" + λόγος, " Logos " "knowledge" is the branch of They are usually permanently attached to a solid substrate of some kind, such as a rock, or the hull of a ship in the case of barnacles. In Geology, rock is a naturally occurring aggregate of Minerals and/or Mineraloids The Earth's outer solid layer the ‘ Lithosphere A hull is the 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 A barnacle is a type of Arthropod belonging to infraclass Cirripedia in the subphylum Crustacea, and is hence distantly related to Corals lay down their own substrate. Corals are Marine organisms from the class Anthozoa and exist as small Sea anemone –like Polyps typically in colonies of many
Sessile animals typically have a motile phase in their development. Motility is a biological term which refers to the ability to move spontaneously and actively consuming energy in the process Sponges have a motile larval stage, which becomes sessile at maturity. The sponges or poriferans (from Latin porus "pore" and ferre "to bear" are Animals A larva ( Latin; plural larvae) is a juvenile form of Animal with indirect development, undergoing Metamorphosis (for example In contrast, many jellyfish develop as sessile polyps early in their life cycle. Jellyfish are free-swimming members of the phylum Cnidaria. They have several different basic morphologies that represent several different cnidarian classes including the 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. Many sessile animals, including sponges, corals, and hydra, are capable of asexual reproduction in situ by a process of budding. Corals are Marine organisms from the class Anthozoa and exist as small Sea anemone –like Polyps typically in colonies of many Hydra is a Genus of simple fresh-water animals possessing radial symmetry. Asexual reproduction is a form of reproduction which does not involve Meiosis, Ploidy reduction or Fertilization. Budding (also called burgeoning) is the formation of a new Organism by the protrusion of part of another organism
Sessile animals
Sponges
Most of the 2000 species of sponges are marine animals; only about 50 species live in fresh water. Sponges are sessile animals that come in a wide variety of sizes and shapes and are adapted to different movement patterns of water. Sponges reproduce both sexually and asexually. In most species, a single 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.
Clumping is a behavior in an animal, usually sessile, in which individuals of a particular species group close to one another for beneficial purposes.
See also
The Sessile Oak ( Quercus petraea, or Quercus sessiliflora) also known as Durmast Oak, is a species of Oak native to most of EuropeDictionary
sessile
-adjective
- (zoology) permanently attached to a substrate; not free to move about; "an attached oyster"
- (botany) attached directly by the base; not having an intervening stalk; "a sessile leaf"
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