1. Unit 8 Chapter 29 Echinoderms and Invertebrate Chordates

2. What is an Echinoderm? Radially symmetrical, with spiny skin
Endoskeletons of calcium carbonate and pincerlike appendages

3. What is an Echinoderm? Water Vascular System
For locomotion, food-getting, and gas exchange
Tube feet = tiny suction cups

4. Diversity of Echinoderms
Sea stars
Brittle stars

5. Diversity of Echinoderms
Sand dollars
Sea urchins

6. Diversity of Echinoderms
Sea cucumbers
Sea lilies & feather stars

7. What is a Chordate? Phylum Chordata includes:
Urochordates (Sea Squirts)
Cephalochordates (Lancelets)
Vertebrates (all vertebrates)
Dolphin embryo

8. 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)

9. Invertebrate Chordates
Tunicates or sea squirts
Have all chordate characteristics as larva, but not as adults

10. Invertebrate Chordates
Lancelets
The only chordate to retain all characteristics as an adult