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The huge bug was reportedly found in the city of Cordoba, in the central Argentine province of the same name.
A social media user called Ezequiel Lobo posted a picture of the giant creature on Tuesday, having laid it alongside a mosquito.
Lobo appeared to identify the mysterious beast as a mosquito, despite the fact it was several times larger than the insect next to it.
He said in the caption: "Look at the size of the mosquito that just came in through my window.
"He came in like a champion, my mother panicked and sprayed it with Raid.
"I haven't found anything similar online. Either it's Chernobyl's new evolution or I just found out that I am in Jumanji."
Lobo asked others to comment if they had seen anything similar, but not everyone had something constructive to say - with one joking that it was an 'alien'.
One slightly more helpful user commented: "The small one on the right side is Aedes aegypti and it can transmit Dengue fever, Yellow fever, Zika... The enormous one on the left is Psorophora ciliata, and it cannot cause anything like that."
According to insect expert Michael H. Reiskind, Psorophora ciliata, which are indigenous to the eastern United States, usually appear after flooding.
He said their bite can cause significant pain, but they do not usually carry disease. Because of this, they apparently only pose a risk to those who are allergic.
According to the University of Florida (a state where Psorophora ciliata are often seen), the species are also known as 'gallinipper' or 'shaggy-legged gallinipper' and are usually associated with other floodwater mosquitoes.
"Floodwater mosquitoes often lay their eggs in low-lying areas with damp soil and grassy overgrowth," a post on the Entomology and Nematology department explains.
"When these areas flood following a dry period, the eggs hatch, often producing very large numbers of adult mosquitoes.
"Psorophora ciliata occurs east of the Continental Divide (Howard et al. 1917, Darsie and Ward 2005) from the southern portions of Ontario and Quebec (Wood et al. 1979, Foss and Deyrup 2007) to as far south as Argentina (Campos et al. 2004)."
However, while some people have identified the bug as Psorophora ciliata, it has not been confirmed whether this is the case.
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