Abstract
A three-year investigation was carried out on the life cycle of Aeshna cyanea (Müller, 1764) (Odonata, Aeshnidae) in temporary freshwater pools in Central Italy. The instars were discriminated by size and scatter plot, based on measurements of labium length, head width, metafemur length, forewing-pad length and total larval body length. The prolarvae instar was derived by Dyar's law. The mean increase value index between following and previous instar was between 1.26 and 1.33 for isometric variables, and around 1.96 for the wing-pad allometric variable. A. cyanea entered diapause mainly at the F-2 instar, placing it almost intermediate between the Southern Spain populations, which usually overwintered in the F-3 instar, and those of England and Central Europe, who spent their last winter in F-1. A. cyanea appeared to be a `summer species', as defined by Corbet (1962), and the population we studied had a semivoltine life cycle.
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Goretti, E., Ceccagnoli, D., La Porta, G. et al. Larval development of Aeshna cyanea (Müller, 1764) (Odonata: Aeshnidae) in Central Italy. Hydrobiologia 457, 149–154 (2001). https://doi.org/10.1023/A:1012227400613
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DOI: https://doi.org/10.1023/A:1012227400613