BIO 121 Lecture Notes - Lecture 17: Malpighian Tubule System, Circulatory System, Hydrostatic Skeleton
10 Dec 2020
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Document Summary
Have direct development, some indirect, many varieties. Hemimetabolous(incomplete)metamorphosis is a direct development, except for wings. Exoskeleton, tracheal system, malpighian tubules(concentrate waste to preserve water) are all land adaptations. Flowering plants emerged and diversified; huge diversification, especially flying insects. Ectoprocts, brachiopods, and phoronids have a lophophore feeding apparatus. Some mollusks, annelids, and ribbon worms have swimming planktonic trochophore larvae. There is no synapomorphy for the lophotrochozoans. Wide lifestyle, environment, marine, fresh, and terrestrial. 3parts to a mollusk: highly reduced coelom; mantle. Mollusks:digestive system: have a complete one way gut. Radula: chitinous ribbon, with row of teeth for feeding. Diverse, some grind wood, some break calcium. Hemolymph and coelomic fluid are different fluids. Hydrostatic skeleton: all mollusks except cephalopods; uses incompressibility of fluids to generate forces to antagonize muscles and support body. Have a two gill heart (brachial) pumps blood through gill to a heart, which pumps o2 blood throughout. Pulmonary blood vessel in mantle exchanges gas with pulmonates lung.
