BIOL 125 Lecture Notes - Lecture 6: Jet Propulsion, Insect Wing, Filter Feeder
20 Mar 2017
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33. 1 an overview of protostome evolution: protostomes. 13 phyla include mollusks, annelids, flatworms: name inspired by morphological traits found in some of the phyla in the lineage. Feed structure called lophophore, found in 3 phyla. Rings the mouth in suspension feeding (bryozoans, brachiopods, phoronids) Type of larvae called trochophore, common to many phyla of lineage. Marine larvae, ring od cilia around middle to swim and sweep food into mouth. Neither lophophores nor trochophores qualify as a synapomorphy in. 7 phyla within, including nematoda and arthropoda: all grow by moulting - shedding exoskeleton (cuticle) or external covering. Advantage - provides effective structure for muscle attachment & serves as protection. Diverged into more than 22 phyla: how body plans vary among phyla. Locomotion by muscles applying force to exoskeleton moving legs/ wings. Body cavity (hemocoel) space for organs and fluid, hydrostatic skeleton. Foot: large group of muscles at base of animal, used for movement.
