Century Dictionary and Cyclopedia
- n. The carpus or stigma, a peculiar mark or spot on the wings of some insects. It is a dark-colored triangular or quadrate space on the anterior border of the fore wings of hymenopters, and on both fore and hind wings of dragon-flies. It corresponds to that one of the costal cells which is thickened to strengthen the costal border.
- n. zoology A cell in the outer wing of insects which is often thickened or coloured and so stands out from other cells.
GNU Webster's 1913
- n. (Zoöl.) A thickened opaque spot on the wings of certain insects.
- Ancient Greek πτερόν (pteron) + στίγμα (stigma), meaning "wing mark". (Wiktionary)
“Carpus: the pterostigma of Odonata: the extremity of the radius and cubitus of the primaries: that point in the wings at which they are tratsversely folded.”
“Parastigma: = pterostigma; q.v. Parastigmatic glands: small, circular glands, which secrete a waxy powder, sometimes present around the spiracles of Coccidae.”
“Apical cells or cellules: Trichoptera; the series of cells along the outer margin of wing from pterostigma to arculus.”
“Without the pterostigma, self-exciting vibrations would set in on the wing after a certain critical speed, making gliding impossible. ”
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