Lindsley & Grell, 1972, p. 31
discoverer: Morgan, 11k.
references: Morgan and Bridges, 1916, Carnegie Inst. Wash. Publ. No. 237: 28 (fig.).
phenotype: Longitudinal veins fused at base of wing into bifid stalk. L3 delta-like at tip; L4 often incomplete at tip. Wing margins often excised at tip of L4. Wings spread in proportion to their shortness. High temperature enhances and low temperature produces overlapping of wild type. Stronger in male than in female. Enhances Bx alleles as well as sd, cp, and vgnp (Waletzky). RK1.
cytology: Between 4C7-8 and 4D1-2 according to Demerec, Kaufmann, Fano, Sutton, and Sansome (1942, Carnegie Inst. Wash. Year Book 41: 191).
color figure: P. A. Otto (original)
b & w figure: Morgan, Bridges and Sturtevant, 1925, The Genetics of Drosophila, Bibliog. Genet. 2: 1-262 (original drawn by Edith M. Wallace)