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- W2519400738 abstract "The color patterns of the different larval instars of Cerura vinula Linnaeus 1758 are described and their protective function is discussed. The cuticular melanization is stepwise reduced, in different parts of the pattern at different molts. In the wandering stage, a temporary appearance of epidermal ommochrome results in completely red animals. It is investigated whether the succession of different larval colorations is controlled by the Corpora allata through different levels of juvenile hormone (JH). Head ligation at the end of a young larval instar, eliminating the Corpora allata, causes reddening of the whole epidermis without further development. Injection or topical application of JH before a larval molt causes uniform reduction of all melanin in the new cuticle. This effect does not mimic the stepwise reduction in different cuticular areas which occurs during the normal development. It is concluded that the ommochrome formation at the wandering stage depends on the absence of JH. Head ligation inhibits, in young larvae, the distribution of JH but, at the same time, interrupts that of prothoracicotropic hormone [PTTH], so that a small ecdysone peak results in the absence of JH, similar to the situation at the wandering stage, when it evokes ommochrome formation, but not a complete molt. Excessive JH causes an unspecific melanin inhibition, which cannot, by itself, explain the normal sequence of larval melanization patterns." @default.
- W2519400738 created "2016-09-23" @default.
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- W2519400738 date "1996-01-01" @default.
- W2519400738 modified "2023-10-17" @default.
- W2519400738 title "Effects of Juvenile Hormone and Head Ligations on the Succession of Cryptic Larval Color Patterns in Cerura vinula (Lepidoptera: Notodontidae)" @default.
- W2519400738 doi "https://doi.org/10.1127/entom.gen/20/1996/133" @default.
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