Bio 201 F09 True lect 16 (L17)v3r

Bio 201 F09 True lect 16 (L17)v3r - todays factoid Coral...

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Unformatted text preview: todays factoid Coral Communica4on story posted in Biology in the News on BB chemical communica4on between coral hosts and their algae symbionts is cri4cal for their symbiosis during coral bleaching, this communica4on is thought to break down, causing algae to be a?acked (i.e. rejected) by the immune system of the coral http://www.coralreefnFo.com/ images/coral_reeF.jpg LIFE 8e Fig. 33.1 Deuterostomes Echinoderms Urochordates called tunicates or sea squirts Cephalochordates (lancelets) Vertebrates Hemichordates acorn worms Formally NOT chordates Hemichordates Acorn worms Marine, worm-like deuterostomes a Phylum of Deuterostomes (only brieFy mentioned textbook) Have some similarities to both echinoderms and chordates Tornaria larvae very similar to sea star larvae Have gill slits and dorsal nerve cord similar to chordates Do not have a notochord echinoderms hemichordates chordates Hemichordates Acorn worms Marine, worm-like deuterostomes a Phylum of Deuterostomes (only brieFy mentioned textbook) Have some similarities to both echinoderms and chordates Tornaria larvae very similar to sea star larvae Have gill slits and dorsal nerve cord similar to chordates Do not have a notochord echinoderms hemichordates chordates Phylum Hemichordata Acorn worms and Pterobranchs 3 Body regions Each with Coelomic space Proboscis Collar Trunk Enteropneusts = Acorn Worms free living Hemichordates ~75 known species Up to 2m in length Class Enteropneusta Pharynx Gill Slits - may be homologous to chordate gill slits U-Shaped Collect Food - primary function Also function in respiration http://gecko.gc.maricopa.edu/~lsola/ bio182/labreview/embryo/bipinn.jpg Similarity of hemichordate Tornaria larva to sea star Bipinnaria larva http://scaa.usask.ca/gallery/lacalli/images/tornaria3.jpg Pterobranchs Sedentary tube- dwellers-secrete rigid tubes-colonial-most species: no dorsal nerve cord and only one gill slit Class Pterobranchia ~20 known species All very small (<12mm) Collar tentacles capture small prey and perform gas exchange Some species are colonial 1. Notochord 2. Dorsal, hollow nerve cord 3. Pharyngeal slits 4. Muscular, postanal tail (postanal = behind anus) Invertebrate chordates...
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Bio 201 F09 True lect 16 (L17)v3r - todays factoid Coral...

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