Damselflies are usually delicate versions of dragonflies, but some species challenge their place among the odonates. The most extreme example comes from the moist forests of Central and South America and is known as Megaloprepus caerulatus or the “helicopter damselfly”.
With a wingspan up to 19 cm, the helicopter damselfly is the largest of odonates and a voracious predator in both the aquatic naiad and the aerial adult forms.
Female helicopter damselflies lay their eggs in water-filled tree hollows. Males are territorialists and defend the larger holes as territory, mating with females interested in laying eggs there.
The aquatic juvenile stage, known as naiad or nymph, is a top predator in this reduced ecosystem, feeding on mosquito larvae, tadoples and even other odonates. As adults, they feed mainly on web-building spiders that they capture in areas that receive direct sunlight, such as forest glades.
As the population size of the helicopter damselfly depends on the number and size of available tree hollows and considering that they avoid crossing large gaps between forest patches, any environmental disturbance may have profound impacts on this species. Recent molecular studies also suggest that what is known as Megaloprepus caerulatus is actually a complex of species, as there is no genetic flow between the populations. This makes it (or them) a much more vulnerable species.
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Feindt, W., Fincke, O., & Hadrys, H. (2013). Still a one species genus? Strong genetic diversification in the world’s largest living odonate, the Neotropical damselfly Megaloprepus caerulatus Conservation Genetics, 15 (2), 469-481 DOI: 10.1007/s10592-013-0554-z
Wikipedia. Megaloprepus caerulatus. Available at < https://en.wikipedia.org/wiki/Megaloprepus_caerulatus >. Access on September 7, 2016.
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