BLG 144 Lecture Notes - Lecture 9: Water Vascular System, Filter Feeder, Starfish
20 Mar 2017
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Helps them in moving: madreporite: don"t need to know that. In order to control their movements, they have these ampulla. Sea star podia: adhere to bivalve shells and pull them apart. Feather star podia: trap particles during suspension feeding, can be sessile or actually move, different branch of the echinodermata, very suspension feeders. Asteroidea (sea stars: marine, predators, reproduce sexually with separate sexes, external, can regenerate their arms. Echinoidea (sea urchins: marine, herbivores, use teeth to scrape or remove kelp holdfasts, reproduce sexually with separate sexes, larvae may reproduce asexually. Holothuroidea (sea cucumbers: sausages of the sea, suspension feed or deposit feed, use modified tube feet (tentacles) Include invertebrates and vertebrates: presence of vertebre not essential, monophyletic grouping based on four key morphological features, need all at some point, pharyngeal gill sites, dorsal hollow nerve cord, notochord (cartilaginous or replaced by vertebrae, muscular, post-anal tail. Invertebrate chordates: cephalochordate: lancets, small, mobile, suspension feeders, resemble fish.
