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Would a dragonfly around the size of a Meganeura be a concrete danger for a humanoid about a meter (3'3") tall, weighing around 15kg (33lb)?

This dragonfly wouldn't have particular evolutionary adaptations to be able to predate large animals, being basically just scaled up to have a wingspan of approximately 70cm (27").

The humanoids, on the other hand, are somewhat frail, possessing long and thin bones. They don't have massive anatomical differences from humans, except for some differences in the respiratory system, being closer to a bird's, and, obviously, their stature.

My question is whether or not this insect would be considerably dangerous and perhaps kill or severely hurt these humanoids.

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closed as unclear what you're asking by L.Dutch Dec 27 '18 at 15:03

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Welcome to worldbuilding. Please take the tour and visit the help center to make yourself familiar with our standards. Your question lacks some details: By size alone is hard to tell if something is dangerous or not. $\endgroup$ – L.Dutch Dec 27 '18 at 15:04
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    $\begingroup$ Assuming wingspan is 1.5x body length, a 69 cm wingspan equates to a body 46 cm or 1.5' long. A 1.5' carnivore would believably target 3.3' prey, or more likely, the children $\endgroup$ – nzaman Dec 27 '18 at 15:41
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    $\begingroup$ @nzaman: While I don't know about Meganeura, modern dragonflies typically use superior speed & maneuverability to catch smaller airborne prey in a "basket" formed by their legs: dragonfly-site.com/what-do-dragonflies-eat.html So unless the humanoid can fly, no. But the immature nymphs might be a real danger to swimmers. $\endgroup$ – jamesqf Dec 27 '18 at 22:06
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    $\begingroup$ @jamesqf Thank you for the nymphs input, but i think I will have to abandon the idea of dragonflies altogether. A more pressing reason (related to the culture of these humanoids) basically forces me to have a seawater enviroment, and insects eggs and nymphs can't develop with such high salinity levels. $\endgroup$ – Nicholas Mazzer Dec 27 '18 at 23:18