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Under the arthropoda phylum are subphyla Chelicerata, Myriapoda, Crustacea, and Hexapoda. (There is also an extinct class Marrellomorpha and an the extinct Trilobite subphylum). The chelicerata include Spiders, scorpions, mites, etc. Myriapods include centipedes and millipedes. Crustaceans include lobsters, krill, crabs, shrimp, woodlice, etc. Hexapoda include the class Insecta, the insects.

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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; hexapoda named for their consolidated thorax with three pairs of legs.

Under these subphyla are the following classes:

Trilobita - trilobites (extinct)

Arachnida - spiders, scorpions, etc.

Merostomata - horseshoe crabs, eurypterids (extinct), etc.

Pycnogonida - sea spiders

Chilopoda - centipedes

Diplopoda - millipedes

Pauropoda - sister group to millipedes

Symphyla - resemble centipedes

Branchiopoda - brine shrimp etc.

Remipedia - blind crustaceans

Cephalocarida - horseshoe shrimp

Maxillopoda - barnacles, copepods, fish lice, etc.

Ostracoda - seed shrimp

Malacostraca - lobsters, crabs, shrimp, etc.

Insecta - insects

Entognatha - wingless

Marrellomorpha (with one extinct species).

(Possibly) Camptophyllia (extinct)

Potential existence of other arthropod classes is a matter still under debate.

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Among others, the Arthropoda phylum contains the classes Arachnida (the spiders), Merestomata (horseshoe crabs), Myriapoda (centipedes and millipedes), and the subphylum Pancrustacea which includes class Insecta (insects) and various classes below Crustacea, like Branchiopoda, Malacostraca, Maxillopoda, etc. Taxonomic browsers available on the internet can provide more detail.

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Arthropods are characterized by segmented bodies, an exoskeleton made from chitin, and joint appendages. Phylum Arthropoda includes insects, spiders, crustaceans, and others.

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Q: What classes are in phylum arthropoda?
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