BIS 2C Lecture Notes - Lecture 31: Hexapoda, Cestoda, Ecdysis
22 Dec 2019
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Annelida t platyhelminths segmented worms one wayprocessinggut pharynxesophaguscrop gizzard intestine pairedsetae lostinleeches serveasanchoringpointsfor movement hydrostaticskeleton coelominto seperatefluid compartments. 17000species marine terrestrial changeshape for locomotion reproduction monoecious internal fertilization notrochophore eggs idyed first one tohatcheatsrest ofsiblings. Featherduster filter feeder sucksintentacleswhendisturbed spaghettiworms depositfeeders longtentacles beardworms chemolithoautotrophs deepocean noorgans can be30mlong. Clitellata earthworms leeches live ondecaying remains ofwhales lackparapodia r tentacles leeches cut into skin secrete anesthetic so numb make sure cut doesn"t closew anticoagulants. Platyhelminths flatworms acoelomate protostomes incomplegut tree living parasitic cestoda tapeworms exclusivelyparasitesofanimals absorbs allnutrientsbodywouldnormallyget. Danarthropoda most diversegroup ontree of life ventral nervous system segmentation. Arthropods hard article jointedappendages compoundeyes eyeshave no lens usesensingstructures called ommatidia segmentation segments fused into tagma insects have 3 tagma head thorax abdomen. Trilobites fertilization extinct early marine animals segmented cephalized well developedeyes. Xiphosura horseshoe crabs extensive fossilrecord bodymorphologyunchanged bloodused to checkagainstvaccinecontamination. When exposedto uvlight fluoresce e p w g ni e ce.
