wgspd-fg:Sp-1 contains both the wgspd-fg and wgSp-1 mutations.
wgspd-fg:Sp-1/wgl-17 animals have a severely atrophied wing with no margin. The alula of the proximal wing is missing.
wgspd-fg:Sp-1/wgl-17 flies have a substantial loss of wing tissue, and structures distal to the posterior cross vein are missing.