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Generally sessile Hydra attached to a substrate. Sessility is the biological property of an animal describing its lack of a means of self-locomotion. Sessile animals for which natural motility is absent are normally immobile.
As with all Cnidarians, these organisms have a complex life cycle including a motile planktonic phase and a later characteristic sessile phase. Hexacorallia also include the significant extinct order of rugose corals .
Motility is genetically determined, [5] but may be affected by environmental factors such as toxins. The nervous system and musculoskeletal system provide the majority of mammalian motility. [6] [7] [8] In addition to animal locomotion, most animals are motile, though some are vagile, described as having passive locomotion.
Sessility, or sessile, may refer to: Sessility (motility), organisms which are not able to move about; 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
Some organisms are motile throughout their lives, but others are adapted to move or be moved at precise, limited phases of their life cycles. This is commonly called the dispersive phase of the life cycle. The strategies of organisms' entire life cycles often are predicated on the nature and circumstances of their dispersive phases.
The majority of crinoids are motile, but sea lilies are sessile and attached to hard substrates by stalks. Movement in most sea lilies is limited to bending (their stems can bend) and rolling and unrolling their arms; a few species can relocate themselves on the seabed by crawling.
Gemstone meanings are inspired by everything from royal traditions and chakras to ancient cultures and spiritual thoughts. “The myriad of colors of gemstones alone transmit energy via the ...
In botany, sessility (meaning "sitting", in the sense of "resting on the surface") is a characteristic of plant organs such as flowers or leaves that have no stalk. [1] [2] Plant parts can also be described as subsessile, that is, not completely sessile. A sessile flower is one that lacks a pedicel (flower stalk).