BIOL 031 Lecture Notes - Lecture 14: Atmospheric Pressure, Opisthokont, Filter Feeder
14 Apr 2019
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Biol 31 lecture 14 animal evolutionary history: animals, monophyletic group recognized by these traits, multicellular, heterotrophic, moves under own power, has neurons and muscles. How do animals differ from other eukaryotes: multicellular, consumes food to regulate metabolism, mobile at some or all stages of life cycle, bilaterally symmetrical at some or all stages of development, body is supported by structural collagen. Sensory mechanisms: magnetism, electric fields, barometric pressure. Trochozoa: spiralians with trochophore larvae, includes, mollusca, annelida, nemertea, brachiopoda, phoronida, trochophore: free-swimming larva that emerges from egg in primitive mollusks. Ecdysozoa: have exoskeleton made of cells, ecdysis: periodic molting. Deuterostomia: deuterostomal development, enterocoely, pharynx with ciliated gill slits. Chordate features: notochord: cartilaginous skeletal rod, hollow dorsal nerve tube, pharyngeal gill slits, segmental muscles, endostyle: mucus-secreting organ aiding filter feeding. Vertebrates: possesses backbone and cranium, accounts for approximately 5% of animal diversity, ranges in size.
