Gymnoscelis derogata Walker, 1866

Schmidt, Olga, 2020, The structure and musculature of male terminalia in the Palaearctic and Indo- Australian species of the eupitheciine genera Eupithecia Curtis, Gymnoscelis Mabille, and Pasiphila Meyrick (Lepidoptera: Geometridae: Larentiinae), Zootaxa 4896 (2), pp. 224-238 : 230

Gymnoscelis derogata Walker

( Figs 7–8 )

The uncus is finger-shaped, gradually broadening towards the base, shifted to the ventral side of the tegumen. The tegumen is narrow, moderately expanded dorsally and hooded, bearing the longitudinal sutures medio-laterally. The proximal area of the short anal tube is connected to the thin gnathos arms. The rather thin, relatively long muscles m1 connect the lateral corners of the anterior margin of the tegumen to the base of the uncus. The muscles m2(10) run from the tegumen, close to the muscles m1, to the inner surface of the subscaphium on the anal tube. There is a small, somewhat staple-like process at the area of connection of the tegumen to the vinculum. The valva bears a short suture at the base of the costa, with the proximal end of the suture fused with the staple-like process. The rather short muscles m3(2) extend from the area of fusion of the short suture with the tegumen, on the tegminal side, to the basal part of the valva, near the costa. The base of the costa valvae is connected to the lateral membranous region of the band-like transtilla. The labides arising from the base of the costa valvae ventrally consist of thin, curved anterior arms connected to the juxta laterally and thin, curved posterior arms with somewhat S-shaped papillae, narrowing apically. The slightly twisted muscles m4 run from the lateral corners of the anterior margin of the tegumen, close to the staple-like process, to the medial part of the transtilla, whereas the ventral bunch runs to the medial, cupola-shaped region of the transtilla, and the dorsal bunch runs to the membrane dorsad of the transtilla. The muscles m5(7) connect the medial part of the valvae with the distinct longitudinal fold of the valvae, with one bundle attached on the vinculum. The juxta is elongated dorso-ventrally, with the voluminous, curved muscles m8(3) attached to the medial area of the juxta and broadly extended to the dorsal margin of the saccus, with the dorsal layer of the muscles slightly longer than the ventral layer. The distinct sacs of coremata with long hairs are present at the lateral margin of the vinculum, close to the saccus. The aedeagus is large, with the muscles m6(5) broadly running from the dorsal part of the vinculum, ventrad of the staple-like process, to the basal process of the aedeagus. The muscles m7a(6a) run from the ventral margin of the saccus, close to the medium sized sacs of coremata, to the medial part of the aedeagus. The slightly smaller, twisted muscles m7b(6b) connect the distal part of the aedeagus with the ventral margin of the saccus.

Figures

FIGURES 7–8. Gymnoscelis derogata, male genitalia and muscles: 7. Armature (parts of the muscles m2(10) not shown, coremata hairs removed). 8. Aedeagus.