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| Term | Definition |
| Arthropoda | Group including insects, crustaceans, spiders, scorpions, and horse shoe crabs, etc; both living and extinct examples |
| Cephalon | Trilobite head; anterior end |
| Exoskeleton | The hard mineralised shell most commonly found fossilised; for protection and attachment of soft tissues |
| Hypostome | Plate on underside of trilobite in front of mouth |
| Pygidium | Tail region; posterior end |
| Thorax | Mid-region of the exoskeleton; made of several segments |
| Taxonomic hierachy | The system of grouping similar organisms at several layers: phyla, class, orders, family, genera and species |
Author: Sue Beardmore
Last updated: 18/11/06
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