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mouth parts

Diagram of an insect - front view of head Diagram of an insect - side view of head Haustellum Morphology Large Caddisfly (5-segmented palpi) - Ptilostomis - female Scaphinotus viduus mandibles detail - Scaphinotus viduus - female Close up of head, showing mouth parts. - Tenodera sinensis - male Manduca quinquemaculata - Five-spotted Hawk Moth  - Manduca quinquemaculatus Long tongue - Osmia cornifrons
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (M)
No Taxon mouth parts
mouthparts plural noun - insect mouthparts are paired appendages (except for the labrum) used to acquire, manipulate, and chew food. The principal insect mouthparts are, starting from the topmost:
labrum - a sclerite (horny plate of the body) that serves as the "upper lip". Sometimes the labrum is not considered to be a true mouthpart.
mandibles - analogous to the vertebrate jaw, these are used to cut and chew food, as well as for other purposes
maxillae - used in a manner similar to mandibles, but more complex in function, usually have attached maxillary palpi, used for sensing and manipulating food. In some groups, the maxillae are modified into a proboscis.
labium - a fused pair of appendages, analogous to the lower lip, often has attached labial palpi. In some groups may be modified into a proboscis. The tip of the labium is modified in some flies as a sop for liquids, the labellum.
Note that some names of arthropod mouthparts were originally terms for an analogous (but not homologous) vertebrate structure.
See Also
Print References
Gordh and Headrick, A Dictionary of Entomology, p. 595 (1)
Internet References
Works Cited
1.A Dictionary of Entomology
George Gordh, David H. Headrick. 2003. CABI Publishing.