Idaea setosa Xue & Han, 2023

Cheng, Rui, Xue, Da-Yong, Jiang, Nan & Han, Hong-Xiang, 2023, Review of the Idaea proximaria complex (Lepidoptera, Geometridae, Sterrhinae) with descriptions of four new species, ZooKeys 1169, pp. 293-305 : 293

Idaea setosa Xue & Han sp. nov.

Figs 11-12 , 22 , 29 , 32

Type material.

Holotype, ♂, China: Hainan (IZCAS): Qiongzhong, Limushan, Qijiacun, 657 m, 6-7.IV.2010, leg. Jiang Nan, slide no. Geom-5140. Paratypes: Hainan (IZCAS): 1♂1♀, Jianfengling, 900 m, 12.IV.1980, leg. Zhang Baolin; 1♂, Baisha, Yinggeling, Nankai, Mohaocun, 336 m, 15-16.IV.2010, leg. Jiang Nan; 1♂1♀, Bawangling, Dongerlinchang, 1015 m, 8-10.V.2007, leg. Chen Fuqiang, slide no. Geom-5141(♀).

Diagnosis.

The wing pattern is almost identical to that of I. proximaria , I. rectangularis , and I. rectispina . The first segment of the male hind tarsus is pure brown, which is different from the blackish hind tarsus in other species. In the male genitalia, I. setosa is distinctive in the Idaea proximaria complex by the uncus having a swollen posterior half, by the triangular gnathos, and by the valva having a subapical ventral spine. The aedeagus is even in width, not broadened posteriorly, and the cornutus has many more spines than in the other species. The female genitalia are distinctive with a very short ductus bursae and the large corpus bursae.

Description.

Forewing length: male 10 mm, female 9-12 mm. First segment of male hind tarsus pure brown. Head and wing pattern almost identical to I. proximaria , I. rectangularis , and I. rectispina. Forewing costa lacking dark purplish brown scales in females.

Abdomen. Male genitalia. Uncus long, with posterior half swollen and rounded. Gnathos nearly triangular, with blunt tip. Valva long and slender, tapering, apex rounded and setose; dorsal margin nearly straight and only slightly convex near tip; ventral margin with basal two-thirds straight, concave near apex, bearing a finger-like blunt process. Saccus blunt. Anellus a large sclerite, posterior margin flat, slightly tapering towards anterior margin. Aedeagus in even width, cornutus a bunch of long spines, more than 30 spines.

Female genitalia. Ovipositor lobes with small ventral protrusion. Apophyses posteriores ~ 2 × length of apophyses anteriores. Region around ostium membranous, lamella postvaginalis and antevaginalis unmodified. Ductus bursae very short, a small pouch-like process present, an elongate diverticulum present. Corpus bursae very large and rounded, a rounded sclerotised patch present at middle of posterior half, bearing needle-like spines.

Distribution.

China (Hainan).

Etymology.

This species is named from Latin word setosus, referring to the bunch of long spines in the cornutus.

Figures

Figures 1 - 15. (1 - 2) Male hind tibia and tarsus of Idaea proximaria 1 lateral view 2 medial view. (3 - 14) Adults of Idaea proximaria complex 3 - 7 I. proximaria 3 male, Jiguanshan, Sichuan 4 female, Baoxing, Sichuan 5 - 7 Jinsixia, Shaanxi 5 - 6 male 7 female 8 - 9 I. rectangularis sp. nov. 8 holotype, male, IZCAS 9 paratype, female, IZCAS 10 I. rectispina sp. nov., holotype, male, IZCAS 11 - 12 I. setosa sp. nov. 11 holotype, male, IZCAS 12 paratype, female, IZCAS 13 I. linearis sp. nov., holotype, female, IZCAS 14 I. craspedota. 15 Neighbour-Joining (NJ) tree of selected Idaea proximaria complex based on the Kimura two-parameter model. Scale bar: 1 cm (3 - 14).

Figures 16 - 27. (16 - 23) Male genitalia of Idaea proximaria complex 16 - 19 I. proximaria 16 - 17 Shizipo, Sichuan 18 - 19 Jinsixia, Shaanxi 20 I. rectangularis sp. nov., holotype 21 I. rectispina sp. nov., holotype 22 I. setosa sp. nov., holotype 23 I. craspedota. (24 - 27) Aedeagus of I. proximaria complex 24 - 26 I. proximaria 24 Dashuigou, Sichuan 25 Shizipo, Sichuan 26 Jinsixia, Shaanxi 27 I. rectangularis sp. nov., holotype. Scale bars: 1 mm.

Figures 28 - 34. (28 - 29) Aedeagus of I. proximaria complex 28 I. rectispina sp. nov., holotype 29 I. setosa sp. nov., holotype (30 - 34) Female genitalia of I. proximaria complex 30 I. proximaria 31 I. rectangularis sp. nov., paratype 32 I. setosa sp. nov., paratype 33 I. linearis sp. nov., holotype 34 I. craspedota. Scale bars: 1 mm.