Phylum Arthropoda :
* Subphylum Chelicerata :
- Class Merostomata - Horseshoe crabs
- Class Arachnida - Spiders, ticks, mites, scorpions, daddy longlegs
- Class Pycnogonida - Sea Spiders
* Subphylum uniramia :
- Class Crustacea - Homarus, Cancer, Daphnia, Artemia, Cyclops, ...
- Class Chilopoda - Centipeds
- Class Diploda - Millipeds
