Sigilliclystis insigillata (Walker)

Schmidt, Olga, 2023, Comparison of the structure and musculature of male terminalia in the genera Chloroclystis Hübner, Sigilliclystis Galsworthy, and Ziridava Walker (Lepidoptera: Geometridae: Larentiinae), Zootaxa 5278 (3), pp. 555-562 : 557

Sigilliclystis insigillata (Walker)

( Figs 3–4 )

The uncus is rather small, broadening at the base, slightly shifted to the ventral side of the tegumen. The tegumen is slightly elongate, with a small hood-shaped apical extension. The relatively short muscles m1 run from the latero-medial parts of the tegumen towards the uncus and are inserted in its base. The gnathos arms are not distinct. The proximal area of the anal tube is fused with the membrane, which is, in its turn, connected to the transtilla. The muscles m2(10) are attached to the tegumen, close to the muscles m1, and run to the medial part of the subscaphium. The transtilla is rather broad, complex, mostly membranous, arising from the base of the costa valvae dorsad of the labides and incorporating X-shaped sclerotised plates, as in C. v-ata. The basal process of the costa valvae is much reduced, partly fused with the lateral branches of the transtilla. The base of the costa valvae protrudes slightly ventrally, with a short, finger-shaped process connected to the tegumen. The muscles m3(2) extend from the ventral part of the tegumen to the lateral part of the transtilla branch, close to the base of the costa valvae. The muscles m4, consisting of two tightly connected bundles, run from the ventral corner of the tegumen, slightly dorsad of the muscles m3(2), to the short, narrow, vertical membrane anterior to the transtilla. The muscles m4 look like a single transverse tegminal muscle. The short, curved muscles m5(7) extend from the basal part of the valvae to the vinculum, close to the muscles m6(5). The juxta is rather large, elongate, and the long muscles m8(3) connect the upper area of the juxta with the medial part of the flat saccus. The aedeagus is small, with one cornutus on the vesica, with the small muscles m6(5) running from the vinculum, close to the tegumen, to the basal process of the aedeagus. The medium sized muscles m7a(6a) run from the lateral corners of the saccus to the medial part of the aedeagus. The twisted muscles m 7b(6b) connect the distal part of the aedeagus with the medial parts of the saccus, close to the muscles m8(3). There are sacs of coremata with long, stout, slightly curved spines ventrad of the saccus and compound coremata with long pockets of hairs at the margin of the seventh abdominal segment.

Figures

FIGURES 3–4. Sigilliclystis insigillata, male genitalia and muscles: 3. Armature (left valva partly removed, coremata on the left side removed, parts of the muscles m2(10) on the right side, and of m4 on the left side not shown). 4. Aedeagus.