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.1600, from Latin chrysallis, from Greek khrysallis (genitive khrysallidos) "golden colored pupa of the butterfly," from khrysos "gold," perhaps of Semitic origin (cf. Hebrew and Phoenician harutz "gold") + second element meaning something like "sheath."

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The ichneumon wasp (Hymenoptera) is a parasitoid, which means that its larvae feed on their host organism. Using her long, stinger-like ovipositor, the mother wasp injects her eggs into a host's dwelling or body — sometimes even into their larvae. When the wasp's larvae hatch, they will devour their host, which include butterfly pupae and moth caterpillars. (Credit: Therry The & Marilee Sellers | Northern Arizona University, Page Baluch | W.M. ...

from Spot Magazine

Zoo Releases 850 Endangered Butterflies into Wild

Oregon Zoo butterfly conservationist Kim McEuen prepares Oregon silverspot butterfly pupae for a trip to the coast. Hundreds of zoo-reared pupae have been released there this summer in an effort to stabilize declining populations of this threatened species. Photo by Michael Durham, courtesy of the Oregon Zoo.