Seasonal polyphenism of coloration of Urostylis annulicornis Scott, 1874 (Heteroptera, Urostylididae) in Primorsky Krai
DOI:
https://doi.org/10.33910/2686-9519-2026-18-1-180-189Keywords:
Hemiptera, seasonal polyphenism, nymphs, adults, Primorsky Krai, Heteroptera, Urostylididae, Urostylis annulicornisAbstract
Data on seasonal polyphenism in the coloration of Urostylis annulicornis (Heteroptera, Urostylididae) are presented. The study was conducted in the south of Primorsky Krai from 2022 to 2024. Quercus mongolica trees were examined in forest biotopes. Rhytidome plots containing U. annulicornis egg masses, removed from the trunks, were maintained until the second- and third-instar nymphs emerged. Stationary observations were conducted in cages set up under natural conditions on Mongolian oak saplings, where the bugs remained until adult fledging. Changes in nymph coloration are observed as their diet and habitat change – the reddish-brown tint of younger nymph makes the insects less visible against oak bark and budding buds, which are brown in color. Color variations are most pronounced in older nymphs. In addition to camouflage, the bright red coloration of these insects can serve as protection from ultraviolet radiation and deter enemies. Reproductively active U. annulicornis adults found in oak tree crowns exhibit a marked change in the pigmentation of their limbs and first antennal segment by early October. The brighter coloration conceals pairs that remain in one spot for long periods of time among the variegated oak foliage.
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Markova, T. O., Kanyukova, E. V., Maslov, M. V. (2024) Reproductive behavior of Urostylis annulicornis Scott (Heteroptera, Urostylididae) in the southern Far East of Russia. Journal of Insect Biodiversity, vol. 51, no. 2, pp. 38–45. https://doi.org/10.12976/jib/2024.51.2.2 (In English)
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