Glossary entry (derived from question below)
French term or phrase:
La mue qui aboutit à l’imago est dite imaginale.
English translation:
The process leading to the imago is called the imaginal stage
French term
La mue qui aboutit à l’imago est dite imaginale.
This expression comes in this context
Je commencerai par une définition du mot Imago, qui désigne le stade final d’un individu dont le développement se déroule en plusieurs phases (en général œuf, larve et imago).
La mue qui aboutit à l’imago est dite imaginale.
My rough translation:
I would like to start with a definition of the word Imago, which refers to the final stage of an individual whose development takes place in several phases (usually egg, larva and imago).
Even rougher translation of the sentence in question:
. The molting resulting in the imago is known as fledgling???
Sep 19, 2018 14:25: philgoddard changed "Field" from "Art/Literary" to "Other" , "Field (write-in)" from "Mosaic workshop for disabled people" to "(none)"
Sep 19, 2018 16:32: writeaway changed "Field" from "Other" to "Art/Literary"
Sep 19, 2018 16:33: writeaway changed "Field (write-in)" from "(none)" to "Mosaic workshop for disabled people "
Proposed translations
29 years turning out perfect English
Native in: English (Variant: British) 
Works in: French to English, Spanish to English
The process leading to the imago is called the imaginal stage
| Thanks a lot Philippa. |
| agree |
philgoddard
12 mins
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Ta Phil!
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| agree |
Lorraine Dubuc
: I like 'imaginal stage' a lot.
43 mins
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Thanks Lorraine!
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United Kingdom
Doctor of science - German to English
Native in: English 
Works in: German to English, Swedish to English, French to English, and 1 more.
'emergence' - imago emerges from pupa into adult form
The insect is said to go through a metamorphosis when it changes between forms/ life stages, but between individual stages it emerges. e.g. insect emerges (or there is another term 'eclose'/'eclosion'):
https://www.amentsoc.org/insects/glossary/groups/insect-life...
https://www.amentsoc.org/insects/glossary/terms/metamorphosi...
https://www.amentsoc.org/insects/glossary/terms/pupa
The pupa (plural pupae) is the third stage in the life cycle of insects undergoing complete metamorphosis. The four stages are: Egg Larvae Pupa Imago/adult.
The emergence of an adult insect from a pupa or a larvae (or nymph) from an egg is called eclosion.
https://www.amentsoc.org/insects/glossary/groups/insect-life-cycles
http://www.gardenswithwings.com/facts-info/NL2008/a0811ButterflyLifeCycle.html
| neutral |
David Vaughn
: This was originally posted in the "art" category. I'm not sure why it was transferred. But it seems likely that the terminology is used in a "poetic" manner and that it may be necessary to stick closer to the original.
14 mins
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The moult leading to imago is called fledgling
The moult leading to imago is called fledgling
Discussion
Actuellement, la plupart des bandes larvaires est au dernier stade avant la mue imaginale, l'acquisition des ailes et la transformation en ailés.
It's the final moult not the final stage of anything
Just to be clear, scientifically as well as poetically, a fledgling is never the "final" stage of anything. Fledgling strongly implies the first stage of something, in these cases the first stages of maturity.
Curtiss Fledgling, a trainer aircraft
Fergie's Fledglings, a group of Manchester United players recruited under the management of Alex Ferguson
Fledgling (birds), a young bird that has recently left its nest but is still dependent upon parental care and feeding
Fledgling (insect), an insect that has just fledged, i.e. undergone its final moult to become an adult or imago.
Fledgling (novel), a 2005 science fiction novel by Octavia Butler
Fledgling, a 2009 novel of the Liaden universe