Echinoid revision test 0.0 / 5 ? GeologyEchinoid morphologyA2/A-levelAll boards Created by: naomiCreated on: 05-01-14 15:21 83267145 Across 1. Name the type of symmetry for an irregular echinoid (9, 8) 4. Where is the peristome? (6, 3, 5) 5. What is the function of the spines? (10) 6. How do irregular echinoids feed? (6, 7) Down 2. Which is bigger, the ambulacral plate or the interambulacral plate? (15) 3. Name the mode of life of a regular echinoid (9) 7. Are echinoids invertebrates or vertebrates? (13) 8. When did echinoids become extinct? (4, 5)
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