1
$\begingroup$

The wings of several kinds of dragonflies I've seen here in Taiwan all have an apparently special little pigmented spot near the ends of each wing.

Does this spot have a name and a function?

below x2: Taken today in Hsinchu county, Taiwan. Note arrows. I've also asked Identify these two large dragonflies in Taiwan?

Click for full size

dragonfly from Hsinchu county Taiwan dragonfly from Hsinchu county Taiwan

below left: from Identify this black dragonfly with bluish coloration along its flat top, yellow on it's mid-body and green on its head below right: from Identify this black dragonfly with a bright bluish-white band around its body

Click for full size

dragonfly from Hsinchu county Taiwan dragonfly from Hsinchu county Taiwan

$\endgroup$
2
$\begingroup$

Pterostigma is what those spots are. Wikipedia article is at https://en.wikipedia.org/wiki/Pterostigma.

I read the summary of the technical article below.

The pterostigma are heavier than the rest if the wing, and so the insect can glide faster without a destabilising flutter beginning.

The author also believes that the pterostigma contribute to more efficient active flight.

Technical details at: Norberg, R. Åke. "The pterostigma of insect wings an inertial regulator of wing pitch". Journal of Comparative Physiology A. 81 (1): 9–22. doi:10.1007/BF00693547.

$\endgroup$
1

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.