Persistent Form

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Persistent Form

an organism that has maintained a constant external appearance in the course of evolution, passing from one epoch to another without substantial changes. Persistent forms are often called living fossils, or phylogenetic relicts. Examples include a brachiopod of the genus Lingula and king crabs of the genus Limulus, both of which have existed for about 400 million years; a marine mollusk of the genus Neopilina, which has existed for 350 million years; and a lungfish of the genus Latimeria, which has existed for about 250 million years. The occurrence of persistent forms is always due to the stability of the principal features of the organisms’ environment. A closely related term is “bradytelic forms” (seeBRADYTELY).

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No references found			Hanne, who's now wheelchair bound thanks to an assassin's bullet in her spine, is on sparklingly grumpy but persistent form. CHILLER THRILLER; BOOKS by The Mirror (London, England) The order is designed to tackle serious and persistent forms of anti-social behaviour. Young mother's anger at 'degrading' treatment by The Journal (Newcastle, England) Byline: Madeleine Brindley Health Editor A MORE persistent form of a deadly superbug has been discovered in hospitals in South Wales. 'US strain' of bug is found in hospitals; Persistent form of C.diff ... by South Wales Echo (Cardiff, Wales)			Persian lamb Persian language Persian literature Persian lynx Persian melon Persian red Persian Wars Persian wild ass Persianinov, Leonid Persianinov, Leonid Semenovich Persians Persic column persic oil Persica Persichetti, Vincent persienne persilicic Persimfans persimmon persistence persistence forecast persistence of vision persistent persistent current persistent data Persistent Form Persistent Functional Language persistent memory persistent name persistent object persistent spectral holeburning persistent vegetative state persistent virus infection persistent war gas persistent-image device persistron Persius Person Person County person of no account persona Persona Grata Persona Non Grata personal Personal Accounts personal area network personal audio recorder personal cloud Personal Communication Network Personal Communication Services personal communications network			persistent data Persistent Data Storage Architecture Persistent desire Persistent Developmental Stuttering Persistent Distal False Lumen Persistent Distributed Store Persistent Document Object Model persistent ductus arteriosus persistent ductus arteriosus persistent ductus arteriosus persistent ductus arteriosus persistent ductus arteriosus persistent ductus venosus persistent ductus venosus persistent ductus venosus persistent ductus venosus Persistent Elite Creation persistent erection persistent erection persistent erection persistent erection persistent exertion Persistent Felony Offender persistent fetal circulation persistent fetal circulation persistent fetal circulation persistent fetal circulation persistent fetal circulation persistent fetal circulation Persistent Foramen Ovale Persistent Form Persistent Free Radical Persistent Functional Language Persistent generalized lymphadenopathy Persistent generalized lymphadenopathy Persistent generalized lymphadenopathy Persistent generalized lymphadenopathy Persistent Genital Arousal Disorder Persistent Genital Arousal Disorder Persistent Genital Arousal Disorder Persistent Genital Arousal Disorder Persistent Gestational Trophoblastic Disease Persistent Global Attack Model Persistent Ground Surveillance System Persistent Group Reservation Emulation Persistent History Navigation Assistant persistent hyaloid artery persistent hyaloid artery Persistent hyperinsulinemic hypoglycemia of infancy Persistent Hyperinsulinemic Hypoglycemia of the Neonate Persistent Hyperplastic Primary Vitreous Persistent Hyperplastic Primary Vitreous Persistent Hyperplastic Tunica Vasculosa Lentis persistent hyperplastic vitreous persistent hyperplastic vitreous persistent hyperplastic vitreous Persistent Identification Element Persistent Identifiers Linking Infrastructure Persistent Idiopathic Facial Pain Persistent Idiopathic Neonatal Hypoglycemia persistent infection

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