Idaea rectispina Cheng & 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 rectispina Cheng & Han sp. nov.

Figs 10 , 21 , 28

Type material.

Holotype, ♂, China: Hunan (IZCAS): Yanling, Taoyuandong, 631 m, 4-8.VII.2008, leg. Chen Fuqiang, slide no. Geom-5159.

Diagnosis.

In the male genitalia, I. rectispina is similar to I. rectangularis in having a concave uncus, tongue-like gnathos, and in the presence of a small finger-like process on the ventral margin of the valva. However, small but differently sized protrusions are present on the valval costal margin of I. rectispina , but absent in I. rectangularis . The number of cornuti in the aedeagus is six and all are straight in I. rectispina , as opposed to the five in I. rectangularis with one right-angled.

Description.

Wing pattern almost identical to that of I. proximaria , I. rectangularis , and I. setosa . First segment of male hind tarsus covered with blackish scales. Forewing length: male 10 mm.

Abdomen. Male genitalia. Uncus spatulate, posterior margin slightly concave. Gnathos developed, tongue-like, with tip narrow. Valva long and slender, apex rounded and setose; dorsal margin with basal half decorated with small protrusions of different sizes, asymmetrical on the left and right valvae; ventral margin concave at middle, with a small blunt finger-like process. Saccus narrow and blunt. Anellus a large sclerite. Aedeagus with terminal part broadened, cornutus with six straight spines, vesica also with a scobinate area.

Female genitalia. Unknown.

Distribution.

China (Hunan).

Etymology.

This species is named from Latin prefix rect - and Latin word spina, referring to the straight spines of 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.