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petekissdoll
Angemeldet seit:
17.06.2024
Beiträge: 73
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A chrysalis needs to be perfect when a caterpillar or silkworm prepares to transform from pupae to winged adults.***** Since the insect can’t emerge until it has completely matured, any overlooked structural flaws or weaknesses may prove fatal for them. But just as important is a chrysalis’ ability to remain anchored in place—and according to a new study, when it comes to metamorphosis, a butterfly’s delicate silk threads are some of its strongest and most reliable tools.*****
Researchers at China’s Southwestern University recently studied the life cycles of two butterfly species—Danaus chrysippus (plain tiger) and Papilio polytes (common Mormon)— and two silkworm species.***** When it came time for the butterfly and silkworm caterpillars to build their respective chrysalises and cocoons, the team watched as the insects each spun silk into net-like pads. Using an arm-like appendage called a cremaster, they then attached their chrysalis or cocoon to a branch.
Related: How everyone can help monarch butterflies.*****
“The connection between the cremaster and silk pad was observed to be similar to that between the hook and loop of a Velcro fastener, except that the cremaster hook is anchor-shaped rather than being a single hook,” the authors explain their paper published July 22 in ACS Biomaterials Science & Engineering.***** “Such a connection will remain secure, ensuring the safety of the pupae during exposure to wind and rain.”
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