Proboscis

Source: Wikipedia, the free encyclopedia.
This article is about the mouth part. For the butterfly genus, see
Proboscis (genus). For the monkey, see Proboscis monkey. For anomaly of the human nose, see Proboscis (anomaly)
.
A syrphid fly using its proboscis to reach the nectar of a flower

A proboscis (/proʊˈbɒsɪs, -kɪs/) is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates, the term usually refers to tubular mouthparts used for feeding and sucking. In vertebrates, a proboscis is an elongated nose or snout.

Etymology

First attested in English in 1609 from Latin proboscis, the

latinisation of the Ancient Greek προβοσκίς (proboskis),[1] which comes from πρό (pro) 'forth, forward, before'[2] + βόσκω (bosko), 'to feed, to nourish'.[3][4]
The plural as derived from the Greek is proboscides, but in English the plural form proboscises occurs frequently.

Invertebrates

The most common usage is to refer to the tubular feeding and sucking organ of certain invertebrates such as insects (e.g.,

molluscs
.

Acanthocephala

Scanning electron microscopy of proboscis of an Acanthocephala[5]

The

gut
wall of their host.

Lepidoptera mouth parts

Convolvulus hawk-moth (Agrius convolvuli
) feeding with extended proboscis

The mouth parts of Lepidoptera (butterflies and moths) mainly consist of the sucking kind; this part is known as the proboscis or 'haustellum'. The proboscis consists of two tubes held together by hooks and separable for cleaning. The proboscis contains muscles for operating. Each tube is inwardly concave, thus forming a central tube up which moisture is sucked. Suction takes place due to the contraction and expansion of a sac in the head.[6] A specific example of the proboscis being used for feeding is in the species Deilephila elpenor. In this species, the moth hovers in front of the flower and extends its long proboscis to attain its food.[7]

A few Lepidoptera species lack mouth parts and therefore do not feed in the imago. Others, such as the family Micropterigidae, have mouth parts of the chewing kind.[8]

The study of insect mouthparts was helpful for the understanding of the functional mechanism of the proboscis of

plant sap, tree sap, dung[11][12][13] and of adaptations to the use of pollen as complementary food in Heliconius butterflies.[14][15]
An extremely long proboscis appears within different groups of flower-visiting insects, but is relatively rare.

Gastropods

Proboscis of a predatory marine snail Mitra mitra.
Kellet's whelks feeding on a dead fish using a long, prehensile proboscis.

Some

parasitic gastropods.[16][17]

Vertebrates

Asian elephant drinking water with trunk

The elephant's trunk and the tapir's elongated nose are called "proboscis", as is the snout of the male elephant seal.

Notable mammals with some form of proboscis are:

The proboscis monkey is named for its enormous nose.

The human nose is sometimes called a proboscis, especially when large or prominent.

Notable fishes with some form of proboscis are:

See also

  • Beak – Part of a bird
  • Nostril – Nose orifice that enables the entry and exit of air
  • Rostrum (anatomy) – Anatomy term
  • Snout – Extended part of an animal's mouth


References

  1. ^ προβοσκίς, Henry George Liddell, Robert S, A Greek–English Lexicon, on Perseus Digital Library
  2. ^ πρό, Henry George Liddell, Robert Scott, A Greek–English Lexicon, on Perseus Digital Library
  3. ^ βόσκω, Henry George Liddell, Robert Scott, A Greek–English Lexicon, on Perseus Digital Library
  4. Online Etymology Dictionary
    .
  5. PMID 25331738. Art. No. 53. Open access icon
  6. ^ Evans, W. H. (1927) Identification of Indian Butterflies, The Diocesan press. Introduction, pp. 1–35.
  7. ISBN 9780262582179
    .
  8. ISBN 0-03-096835-6
  9. ^ Krenn HW, Kristensen NP (2000). "Early evolution of the proboscis of Lepidoptera: external morphology of the galea in basal glossatan moths, with remarks on the origin of the pilifers". Zoologischer Anzeiger. 239: 179–196.
  10. S2CID 54538516
    .
  11. doi:10.1017/S0952836901000528
    .
  12. S2CID 33428687
    .
  13. PMID 19961330
    .
  14. PMID 24900162
    .
  15. PMID 22208893
    .
  16. ISSN 2595-9913
    .
  17. ISSN 0260-1230.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
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