BIOL 152 1st Edition Lecture 14 Outline of Last Lecture Invertebrates Outline of Current Lecture Ecdysozoan Current Lecture Vertebrates Ecdysozoan Means exoskeleton chitin molting Nematoda Roundworms no segmentation All muscles longitudinal all muscles longitudinal Psuedocoelom complete digestive system No circulatory or respiratory systems Simple body plan nematodes are very abundant Several species parasitic in humans Trichanella These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Arthropoda Segmented Jointed appendages Well developed senses many with compound eyes olfactory antennae Open circulatory system Gills or trachea Arthropoda Cheliceraformes 6 pair of appendages Predators suckers and detritus feeding groups Cephalothorax Arthropoda Myriapoda Centipedes and millipedes Eyes sometimes absent Chewing mouthparts feed upon o Detritus in millipedes o Insects in centipedes Arthropoda Insecta Three body regions Heart and open circulatory system Three pairs of legs on thorax Many species have wings Three sets of mouthparts Cerebral ganglion and ventral nerve cord Metamorphosis Insect Evolution led by o Pollinators disease hosts pests o Radiation of species due to evolution of o Flights o Mouthparts o Flowering plants Arthropoda Crustacea Mostly aquatic Crabs lobster crayfish shrimp barnacles Cephalothorax and abdomen with carapace protecting cephalothorax All feeding strategies Dueterostome 1 Radial and indeterminate 2 Coelom develops from archenteron 3 Blastopore becomes anus Echinodermata Quasi radial pentamerous symmetry in adults Slow moving or sessile Water vascular system Tube feet function in WVS locomotion and feeding External fertilization Asteroidea Each tube foot bears a suction disc that is used in locomotion feeding and adhering to surfaces Regeneration Digestion by averting stomach into pried open bivalve Pisaster present diverse intertidal community Pisaster absent community dominated by one mussel Echinoidea 5 rows of tube feet function in movement Muscles that move their spines for locomotion Mouth is ringed by jaw like structures with teeth
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