unit 8 chapter 29 echinoderms and invertebrate chordates
TRANSCRIPT
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Unit 8Chapter 29
Echinoderms and Invertebrate Chordates
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What is an Echinoderm?
Radially symmetrical, with spiny skin
Endoskeletons of calcium carbonate and pincerlike appendages
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What is an Echinoderm?
Water Vascular System For locomotion, food-getting, and gas
exchange Tube feet =
tiny suction cups
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Diversity of Echinoderms
Sea stars
Brittle stars
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Diversity of Echinoderms
Sand dollars
Sea urchins
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Diversity of Echinoderms
Sea cucumbers
Sea lilies & feather stars
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What is a Chordate?
Phylum Chordata includes:– Urochordates
(Sea Squirts)– Cephalochordates
(Lancelets)– Vertebrates
(all vertebrates)
Dolphin embryo
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What is a Chordate?
All Chordates have the following characteristics at some time during their life:
Notochord = rod-like structure (replaced by backbone in vertebrates)
Dorsal nerve cord = hollow cord (becomes spinal cord in vertebrates)
Gill slits (pharyngeal pouches) develop into gills or disappear
Tail (develops or disappears)
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Invertebrate Chordates
Tunicates or sea squirts Have all chordate characteristics as larva,
but not as adults
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Invertebrate Chordates
Lancelets The only chordate to
retain all characteristics as an adult