Syzeuxis extritonaria Xue, 1999

Li, Jing, Xue, Dayong, Han, Hongxiang & Galsworthy, Anthony C., 2012, Taxonomic review of Syzeuxis Hampson, 1895, with a discussion of biogeographical aspects (Lepidoptera, Geometridae, Larentiinae), Zootaxa 3357, pp. 1-24 : 10-11

Syzeuxis extritonaria Xue, 1999

Figs 5 , 17 , 29

Syzeuxis extritonaria Xue, 1999 , in Xue & Zhu, Fauna Sinica: Insecta, 15: 193, fig. 199, pl.4: 4. Holotype 3, China: Yunnan, Tengchong, Dahaoping. (IZCAS)

Syzeuxis extritonaria Xue, 2000 , Acta Zootaxonomica Sinica, 25 (1): 85, figs 4a, 5f.

Materials Examined. CHINA: 33, Holotype and two Paratypes, Yunnan: Tengchong, Dahaoping, 2020 m, 24–26 May 1992, coll. Xue Dayong, slide no. of Holotype: L-2304, one of Paratypes: L-2277 ( IZCAS).

Description. Antennae in male bipectinate and ciliate apically, female unknown. Labial palpus grey-yellow, very long, extending for more than 1/2 its length beyond frons in male. Frons, vertex, dorsal side of thorax and abdomen grey-yellow to grey yellowish green. Wing pattern. Forewing length: 3 12–13 mm. Forewing grey-yellow to grey yellowish green, hindwing slightly paler. Forewing very broad, with apex pointed, and a little falcate; outer margin straight, with no protrusion, almost equal to inner margin in length; anal angle rounded. Hindwing with apex and anal angle rounded. Forewing with antemedial and postmedial lines straight, yellowish brown, forming small dark brown specks on costa; submarginal line only present as small black dots on costa and between M1 and M2. Hindwing with indistinct dark grey discal spot, very thin curved postmedial line almost parallel to outer margin. Fringes of forewing bright yellowish brown and a little paler on hindwing. Underside: both wings yellow, scattered with dark scales, especially from base to postmedial line on forewing; both wings with black discal spots and yellowish brown postmedial lines, which are almost parallel to outer margins. Forewing with a very small areole. M3 and CuA1 of hindwing not stalked. Hindwing in male with a small basal lobe. Male genitalia. Uncus and gnathos of S. extritonaria similar to that of S. tessellifimbria , but median process of gnathos much shorter and a little broader. Valva membranous and expanded basally; other parts slightly sclerotized, tapered apically, and with a partial flap extending over basal part; costa with a row of dense spines. Juxta undeveloped. Aedeagus a simple tube, without spines or process posteriorly. Female genitalia. Unknown.

Diagnosis. S. extritonaria and S. neotritonaria are closely related and differ from other species by the lack of a stalked M3 and CuA1 on the hindwing, the distinctly falcated forewing apex and the folded valva in the male genitalia. S. extritonaria can be distinguished from S. neotritonaria by the smaller size, the straighter forewing outer margin, and the differently shaped valve.

Distribution. China (Yunnan).

Figures

FIGURES 2 – 13. Adults. 2. Syzeuxis trinotaria (Moore), female; 3. S. tessellifimbria Prout, holotype, female; 4. S. seminanis Prout, holotype, male; 5. S. extritonaria Xue, holotype, male; 6. S. neotritonaria Xue, holotype, male; 7. S. magnidica Prout, lectotype, male; 8. S. subfasciaria (Wehrli), paralectotype, male; 9. S. heteromeces Prout, holotype, male; 10. S. furcalineas sp. nov., holotype, male; 11. S. nigrinotata (Warren), lectotype, male; 12. S. pavonata sp. nov., holotype, male; 13. S. calamisteria Xue, holotype, female. Scale bar = 1 cm.

FIGURES 14 – 19. Male genitalia. 14. Syzeuxis trinotaria (Moore); 15. S. tessellifimbria Prout; 16. S. seminanis Prout; 17. S. extritonaria Xue; 18. S. neotritonaria Xue; 19. S. magnidica Prout. Scale bar = 1 mm.

FIGURES 26 – 37. Aedeagus. 26. Syzeuxis trinotaria (Moore); 27. S. tessellifimbria Prout; 28. S. seminanis Prout; 29. S. extritonaria Xue; 30. S. neotritonaria Xue; 31. S. magnidica Prout; 32. S. subfasciaria (Wehrli); 33. S. heteromeces Prout; 34. S. furcalineas sp. nov.; 35. S. nigrinotata (Warren); 36. S. pavonata sp. nov.; 37. S. calamisteria Xue. Scale bar = 1 mm (except scale bar = 0.5 mm for fig. 35.)