Difference between revisions of "Cocoon"
(Created page with 'File:lighterstill.jpgright|frame ==Origin== French cocon, from Occitan coucoun, from coco shell, probably ultimately from Latin coccum kermes ([[...') |
m (Text replacement - "http://" to "https://") |
||
| Line 3: | Line 3: | ||
==Origin== | ==Origin== | ||
French cocon, from Occitan coucoun, from coco shell, probably [[ultimately]] from [[Latin]] coccum kermes ([[thought]] to be a gall or berry), from [[Greek]] kokkos berry, kermes | French cocon, from Occitan coucoun, from coco shell, probably [[ultimately]] from [[Latin]] coccum kermes ([[thought]] to be a gall or berry), from [[Greek]] kokkos berry, kermes | ||
| − | *[ | + | *[https://en.wikipedia.org/wiki/17th_century 1679] |
==Definitions== | ==Definitions== | ||
| − | *1a : an envelope often largely of silk which an insect [ | + | *1a : an envelope often largely of silk which an insect [https://en.wikipedia.org/wiki/Larva larva] forms about itself and in which it passes the [https://en.wikipedia.org/wiki/Pupa pupa] [[stage]] |
:b : any of various other protective coverings produced by [[animals]] | :b : any of various other protective coverings produced by [[animals]] | ||
*2a : something suggesting a cocoon especially in providing protection or in producing [[isolation]] <wrapped in a cocoon of blankets> <an interest in the world beyond the everyday cocoon most of us construct — Peter Mayle> | *2a : something suggesting a cocoon especially in providing protection or in producing [[isolation]] <wrapped in a cocoon of blankets> <an interest in the world beyond the everyday cocoon most of us construct — Peter Mayle> | ||
:b : a protective covering placed or sprayed over [[military]] or naval equipment in storage | :b : a protective covering placed or sprayed over [[military]] or naval equipment in storage | ||
==Description== | ==Description== | ||
| − | A '''cocoon''' is a casing spun of [ | + | A '''cocoon''' is a casing spun of [https://en.wikipedia.org/wiki/Silk silk] by many moth [https://en.wikipedia.org/wiki/Caterpillar caterpillars], and numerous other [https://en.wikipedia.org/wiki/Holometabolous holometabolous] insect larvae as a protective covering for the pupa. |
| − | Cocoons may be tough or soft, [[opaque]] or [[translucent]], solid or meshlike, of various [[colors]], or composed of multiple layers, depending on the [[type]] of insect larva producing it. Many moth caterpillars shed the larval hairs ([ | + | Cocoons may be tough or soft, [[opaque]] or [[translucent]], solid or meshlike, of various [[colors]], or composed of multiple layers, depending on the [[type]] of insect larva producing it. Many moth caterpillars shed the larval hairs ([https://en.wikipedia.org/wiki/Seta setae]) and incorporate them into the cocoon; if these are [https://en.wikipedia.org/wiki/Urticating_hair urticating hairs] then the cocoon is also irritating to the [[touch]]. Some larvae attach small twigs, fecal pellets or pieces of vegetation to the outside of their cocoon in an attempt to disguise it from predators. Others spin their cocoon in a concealed location – on the underside of a leaf, in a crevice, down near the base of a tree trunk, suspended from a twig or concealed in the leaf litter.[5] |
| − | The silk in the cocoon of the [ | + | The silk in the cocoon of the [https://en.wikipedia.org/wiki/Silk_moth silk moth] can be unravelled to get silk fibre which makes this moth the most [[economically]] important of all Lepidopterans. The moth is the only completely [[domesticated]] Lepidopteran and does not exist in the wild. |
| − | Insects that pupate in a cocoon must [[escape]] from it, and they do this either by the pupa cutting its way out, or by secreting [[fluids]] that soften the cocoon. Some cocoons are constructed with built-in lines of weakness along which they will tear easily from inside, or with exit holes that only allow a one-way passage out; such features [[facilitate]] the [[escape]] of the adult insect after it emerges from the pupal skin.[ | + | Insects that pupate in a cocoon must [[escape]] from it, and they do this either by the pupa cutting its way out, or by secreting [[fluids]] that soften the cocoon. Some cocoons are constructed with built-in lines of weakness along which they will tear easily from inside, or with exit holes that only allow a one-way passage out; such features [[facilitate]] the [[escape]] of the adult insect after it emerges from the pupal skin.[https://en.wikipedia.org/wiki/Pupa#Cocoon] |
[[Category: Biology]] | [[Category: Biology]] | ||
Latest revision as of 23:45, 12 December 2020
Origin
French cocon, from Occitan coucoun, from coco shell, probably ultimately from Latin coccum kermes (thought to be a gall or berry), from Greek kokkos berry, kermes
Definitions
- 1a : an envelope often largely of silk which an insect larva forms about itself and in which it passes the pupa stage
- b : any of various other protective coverings produced by animals
- 2a : something suggesting a cocoon especially in providing protection or in producing isolation <wrapped in a cocoon of blankets> <an interest in the world beyond the everyday cocoon most of us construct — Peter Mayle>
- b : a protective covering placed or sprayed over military or naval equipment in storage
Description
A cocoon is a casing spun of silk by many moth caterpillars, and numerous other holometabolous insect larvae as a protective covering for the pupa.
Cocoons may be tough or soft, opaque or translucent, solid or meshlike, of various colors, or composed of multiple layers, depending on the type of insect larva producing it. Many moth caterpillars shed the larval hairs (setae) and incorporate them into the cocoon; if these are urticating hairs then the cocoon is also irritating to the touch. Some larvae attach small twigs, fecal pellets or pieces of vegetation to the outside of their cocoon in an attempt to disguise it from predators. Others spin their cocoon in a concealed location – on the underside of a leaf, in a crevice, down near the base of a tree trunk, suspended from a twig or concealed in the leaf litter.[5]
The silk in the cocoon of the silk moth can be unravelled to get silk fibre which makes this moth the most economically important of all Lepidopterans. The moth is the only completely domesticated Lepidopteran and does not exist in the wild.
Insects that pupate in a cocoon must escape from it, and they do this either by the pupa cutting its way out, or by secreting fluids that soften the cocoon. Some cocoons are constructed with built-in lines of weakness along which they will tear easily from inside, or with exit holes that only allow a one-way passage out; such features facilitate the escape of the adult insect after it emerges from the pupal skin.[1]
