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There are variations depending on the species; not all arthropods have mouthparts used to chew; some have sucking mouthparts, depending on life cycle there may be none. For those that do have jaw-like functions, you might see:

Mandibles: For shearing, piercing, and processing food.

Labra (singular labrum): Functions as an "upper-lip."

Maxillae: Ancestral biramous (two-branch) appendages for manipulating and tasting food. The slender walking-limb like part is called a maxillary palp (in aquatic crustaceans, the mandible also bears a palp.) Ancestrally, first and second maxillae were present.

Maxillae can be fused or modified into derived structures. In some insects the second maxillae are fused to form a labium (lower lip).

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11y ago

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