Roundworms are classified as pseudocoeloms, because they do not have a full-fledged body cavity. The body cavities found in more advanced non-nematode species are lined with mesodermal tissue, as are the organs. In pseudocoeloms, however, the cavity is lined with mesodermal tissue on the out...
While there are plenty of free-living flatworms and roundworms, there are parasitic forms of both flatworms and roundworms that cause disease in humans. ... Roundworms that cause disease include Ascaris, alarge intestinalworm that can grow to the size of a pencil, as well as hookworms and...
roundworms flatworms rotifers eyespots gastrovascular phylum Flatworms,Roundworms& Rotifers Phylum:Platyhelminthes •Platy=flathelminthe=worm •Simplestwithbilateralsymmetry –Solidbody->3germlayersfused –Acoelomates(nobodycavity) 7SurvivalCharacteristics 1.Feeding –ScavengersorParasites 2. Response –Sen...
calledacuticle--providessomeprotectionbutdoesNOTsupportbody--relyonhydrostaticskeleton2.Listthecharacteristicsofnematodesthatdistinguishthemfromotheranimalphyla.---commonlycalledtheroundworms---havethick,multilayeredcuticlesecretedbyunderlyingepidermis---exchangeoxygenandnutrientsthroughbothcuticleandintestine(onlyonecell...
(Whipworm) Polymyariantype (Ascarids) Meromyariantype (Hookworm) Thearrangementofthesomaticmuscles Digestivesystem Mouthpharynxesophagus intestineanus 咽管食管肠管肛门 Reproductivesystem malereproductivesystem Testisseminalvesicle 睾丸储精囊 vasdeferens 输精管 ejaculatoryduct 射精管 Mostfemalesusuallyhavetwoovaries,...
PlatyhelminthesAllothershavebodycavities PoriferaCnidaria Ctenophora BasicPlatyhelminthesfeatures Eversiblepharynx Gastrovascularcavity Structure Functions Waterandionbalance Nervoussystem UnidirectionalAP brain distinctnervecordssensoryorgans Movement Reproduction Hermaphrodites Internalfertilization penis,sometimeswithstylet ...