The defining diagnostic features of Phylum Arthropoda include:
Jointed appendages and a chitinous exoskeleton
Phylum Arthropoda is defined by two key diagnostic features: jointed (segmented) appendages, which give the phylum its name, and a hard exoskeleton made of chitin that covers and protects the body and is periodically shed through moulting.
A notochord and pharyngeal gill slits are chordate features, a moist mucus-secreting skin with no hard covering describes groups like annelids or amphibians, and radial symmetry with nematocysts on tentacles describes cnidarians. None of these apply to arthropods.
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