Bio Notes January 29

Bio Notes January 29 - Bio Notes Key: Green- Subphylum Blue-

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Bio Notes January 29, 2009 Key: Green- Subphylum Blue- Phylum Highlight- class Red- Group Animal Kingdom: The Deutrostomes Deutrostomes o Radial cleavage o Blastopore becomes anus o Mouth develops from another opening at the anterior o Basal deutrostomes larvae have a looped shaped ciliated band used for locomotion o Bilaterally symmetrical in larvae and/or adult o Pharyngeal slits (lost in echinoderms) Echinodermata o Bilateral symmetry in larvae (some members reorganize to pentaradial symmetry in adulthood, water vascular system, tube feet, spiny skin. o Marine animals with spiny skin and endoskeleton CaCO3 plates and spines that project out (pedicellariae) and keep surface free of debris o Water vascular system Water flows in and out, moved by cilia lining the canals Functions in gaseous exchange, feeding and as a hydrostatic (when it fills the various contractile fibers contract giving it a motion) skeleton for locomotion o Tube feet When valve shuts fluid-filled ampulla at the base contract forcing fluid into foot, extends Suction structures for adherence o Larvae Exhibit bilateral symmetry, ciliated and free swimming o Other No brain, excretory organs, complete digestive system, simple nervous system, well developed coelom Class Asteroidea o Sea stars Adult develops central disc with 5 or more arms exhibiting pentaradial symmetry Carnivorous predators Fig 31-2
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Class Echinoidea o Sea Urchins, sand dollars Lack arms Solid shell Covered with movable spines that push it along, together with feet Living pin cushions Class Ophiuroidea o Largest class within subphylum o Similar to sea stars o Rapid movement, via long slender arms o Tube feet collect and handle food, not for locomotion Class Holothuroidea o Sea cucumbers Elongated flexible body Circle of modified tube feet that surrounds mouth Endoskeleton, circulatory system Raises body to spawn, can eviscerate in adverse conditions- digestive tract respiratory and gonads ejected from body (can then be regenerated) Hemichordata o Acorn worm Marine Three part body (proboscics, collar, trunk) Bury in mud or sand
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Bio Notes January 29 - Bio Notes Key: Green- Subphylum Blue-

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