Letter | Published:

Graded Mutations in Wings of a Stonefly

Naturevolume 140pages112113 (1937) | Download Citation

Subjects

Abstract

MORE than two hundred definable variants have been recognized in the wings of the variable stonefly, Allocapnia pygmœa Burmeister. Some of them were mentioned in a former paper1. The three following deviations are new and merit special reference. Figs. 1 and 2 are left and right forewings of the same female, the former nearly normal, the latter highly exceptional ; Fig. 3 is the left forewing of another and Fig. 4 that of a third. Left wings are seen from below. In a typical plecopterous forewing (Fig. 1), the radial sector (2) arises directly from the radius (1) by its own radicle ; it is separated from the arculus or basal anastomosis (4) by a radial internode (5) and from the median stem (3) by the basimedian passage (6). The hindwing is characterized, typically but not invariably, by a partial fusion of radial sector and median vein, which leave the arculus by a common mediosectoral pedicel. In A. pygmœa these veins issue separately from the arculus on an average of 8 per cent in five hundred hindwings.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

Author information

Affiliations

  1. Mille Isles, St. Jérome, Quebec

    • ARTHUR WILLEY

Authors

  1. Search for ARTHUR WILLEY in:

About this article

Publication history

Issue Date

DOI

https://doi.org/10.1038/140112b0

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.