key characteristics of phylum arthropoda (5)
- hard exoskeletons of chitin
- metamorphosis
- moulting (ecdysis)
- segmented (tagmata)
- bilaterally symmetrical
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| Term | Definition |
|---|---|
key characteristics of phylum arthropoda (5) | - hard exoskeletons of chitin
- metamorphosis
- moulting (ecdysis)
- segmented (tagmata)
- bilaterally symmetrical |
define bilateral symmetry | body can be divided into two identical halves |
define cephalisation | concentration of sensory organs in the head region, including eyes |
characteristics of arachnida (3) | - no antennae
- fangs (chelicerae)
- 8 legs
eg spider |
characteristics of uniramia (3) | - 1 pair antennae
- mandibles
- uniramous legs
eg millipedes |
characteristics of crustacea (3) | - 2 pair of antenna
- mandibles
- biramous legs
eg crab |
layout of crayfish |  |
function of antennule/antenna | sensory/touch organs |
function of rostrum | protection (extension of carapace) |
function of pincers/cheliped | defence |
function of mandibles and maxilla | food handling |
function of maxillipeds | touch, taste & food handling |
function of swimmerets | swimming
1st-2nd male swimmerets transfer sperm
2nd-5th female swimmerets carry eggs |
function of uropod | swimming & egg protection |