1. Invertebrates 4: Phylum Echinodermata & Phylum Chordata!
Marine Ecology, April 30, 2008
Invertebrates 4:
Phylum Echinodermata &
Phylum Chordata!

2. Phylum Echinodermata Basic features
Calcareous internal skeleton
Water vascular system (controls tube feet)
Pentamerous symmetry (adults)/bilateral symmetry (larvae)
Mutable connective tissue
General body organization

3. Class Asteroidea (sea stars)
Appearance
Location
Other aspects of natural history
Pisaster ochraceus
Pycnopodia helianthoides

4. Class Echinoidea (urchins and relatives)
Appearance
Location
Other aspects of natural history
Strongylocentrotus purpuratus
Strongylocentrotus franciscanus

5. Class Holothuroidea (sea cucumbers)
Cucumaria miniata
Photo: Neil McDaniel, Waterhouse Marine Images

6. Class Ophioroidea (Brittle stars, basket stars)

7. Class Crinoidea (Sea lilies, a.k.a feather stars)

8. Phylum Chordata Subphylum Urochordata
Our closest invertebrate relatives are slimy sacs that pump seawater

9. Class Ascidacea (tunicates)

10. Family Cottidae: sculpins

11. Family Gobiesocidae: clingfish

12. Family Pholidae: gunnels
Photo: Pelagia Scuba

13. Family Hexagrammidae (lingcods and greenlings)