Once stretched up, the eyes stick out like selfie sticks for the rest of the fly’s life.
Biologists have known that eyestalks evolved in eight different fly families. Yetflies have gotten so little scientific attention that a lot of their basic biology has been a string of question marks.
Video images show the eyestalks curl and rise irregularly. Yet “they are not flopping around while partly inflated,” says Xiaolin Chen, an entomologist and evolutionary biologist at the Chinese Academy of Sciences in Beijing. “They seem slightly stiff, but still flexible enough.” Females of the species may raise shorter eyestalks too — if Chen and her colleagues have found the right females. Chen suspects that what are now named as two species, based on the few specimens available, may just be two sexes of the same species. The new paper describes a maleHer stalks aren’t as magnificent as his, but she has some.Pelmatops
and other kinds of stalk-eyed flies face off, eyestalk to eyestalk, with uppity intruders. There’s no knocking and locking stalks in fierce fly disputes though. Any pushing and shoving, Chen says, is “done with other body parts.” Extreme eyes may also have other benefits. In the wild, Chen finds these fruit flies on long stems ofberry brambles. The eyes naturally periscope outward and upward, allowing the flies to spot danger while the body stays hidden in the greenery.articles, delivered to your inbox
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