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Psuedocoelomate ?

Answer» Before have a idea about coelom! In some protostomes, the embryonic blastocoele persists as a body cavity. These protostomes have a fluid filled main body cavity unlined or partially lined with tissue derived from mesoderm.This fluid-filled space surrounding the internal organs serves several functions like distribution of nutrients and removal of waste or supporting the body as a hydrostatic skeleton.A pseudocoelomate or blastocoelomate is any invertebrate animal with a three-layered body and a pseudocoel. The coelom was apparently lost or reduced as a result of mutations in certain types of genes that affected early development. Thus, pseudocoelomates evolved from coelomates.[14] "Pseudocoelomate" is no longer considered a valid taxonomic group, since it is not monophyletic. However, it is still used as a descriptive term.Important characteristics:lack a vascular blood systemdiffusion and osmosis circulate nutrients and waste products throughout the body.lack a skeletonhydrostatic pressure gives the body a supportive framework that acts as a skeleton.no segmentationbody wallepidermis and muscleoften syncytialusually covered by a secreted cuticlemost are microscopicparasites of almost every form of life (although some are free living)eutely in someloss of larval stage in somepossibly pedomorphism
Invertebrate organisms whose body cavity is not derived from a MESODERM, as in coelomates, and thus, have pseudocoels are called PSEUDOCOELOMATES. Eg :- roundworms.


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