BIOLOGY FORM 4. INVERTEBRATES ARTHROPODS. ARTHROPODS. Phylum TARDIGRADA Phylum PENTASTOMA Phylum ONYCHOPORA. What is Arthropods. Protostome Very diverse BUT share TWO characteristics anatomical features:
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400 living species in 1 class
100 species placed in 1 class
70 species placed in 1 Class, 1 Order