Geology 0.0 / 5 ? GeologyTrilobitesA2/A-levelAQA Created by: Melissa HaleCreated on: 10-01-18 08:44 What phylum are Trilobites part of? Arthropoda 1 of 9 What class are trilobites part of? Trilobita 2 of 9 What is the name of tough substance that makes up a trilobites hard exoskeleton? Chitin 3 of 9 What section of a Trilobite is the cephalon? Top 4 of 9 What section of a Trilobite is the thorax? Middle 5 of 9 What section of a trilobite is the pygidium? Bottom 6 of 9 What is the term for the process where a trilobite sheds its exoskeleton? Ecdysis 7 of 9 When did trilobites first come about? 540 million years ago 8 of 9 What is a gill? Feathery structure used for gas exchange that is positioned above the legs. 9 of 9
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