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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
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (M)
No Taxon mouth parts
Identification
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.
Remarks
Note that some names of arthropod mouthparts were originally terms for an analogous (but not homologous) vertebrate structure.
See Also
mouthparts
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.