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Under arthropoda are subphyla Chelicerata, Myriapoda, Crustacea, and Hexapoda. There is also an extinct class Marrellomorpha and an the extinct Trilobite subphylum. The chelicerata, like Spiders, scorpions, mites, etc., get their name from having appendages appear before the mouth; myriapods like centipedes and millipedes characterized by a high count of body segments and legs; crustaceans like crabs, shrimp, woodlice characterized by their biramous (two-part) limbs and a nauplius larval form; hexapoda named for their consolidated thorax with three pairs of legs.

Some text may show subphyla as "classes" but usually the term 'class' has a specific denotation within taxonomy; there are more than just three classes under these subphyla. Some examples would be class Arachnida, Chilopoda, Branchiopoda, Insecta, and Malacostraca - but there are many more.

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11y ago

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