Idaea linearis 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 linearis Xue & Han sp. nov.

Figs 13 , 33

Type material.

Holotype, ♀, China: Hubei (IZCAS): Yingshan, Taohuachong, 590 m, 23-27.VI.2014, leg. Xue Dayong, slide no. Geom-5170. Paratypes: Hubei (IZCAS), 5♀, same data as holotype, leg. Jiang Nan et al., slide no. Geom-5169. Shaanxi (IZCAS): 1♀, Zhashui, Yingpanzhen, Niubeiliang, Laolin, 1046 m, 12-15.VII.2017, leg. Cui Le; 1♀, Foping, Yueba, 1093 m, 29.VI.-1.VII.2012, leg. Li Jing, slide no. Geom-5183; 1♀, Shangnan, Jinsixia, 766 m, 16-19.VII.2017, leg. Cui Le, slide no. Geom-5139.

Diagnosis.

On the wing pattern, I. linearis is distinctive in that the postmedial line is continuous and does not form black dots on the veins. The female genitalia are distinguished by the smooth lamella postvaginalis, which is divided posteriorly and bears a pair of processes; by the connection of the spinules of the ductus bursae and the corpus bursae, which form a spoon-shaped patch; and by the presence of the appendix bursae diverging anteriorly from the corpus bursae.

Description.

Head and wing patterns almost identical to previous species, except that the postmedial line is continuous rather than consisting of black spots on veins. Forewing length: female 10-11 mm. Forewing costa lacking dark purplish brown scales in female, unknown in male.

Abdomen. Male genitalia. Unknown.

Female genitalia. Ovipositor lobes with small ventral protrusion. Apophyses posteriores ~ 2 × length of apophyses anteriores. Lamella postvaginalis an elongate smooth sclerite, posterior margin divided, with a pair of proximal processes. Lamella antevaginalis shapeless. Ductus bursae short, wrinkled and spinulose, with a small, rounded, appendix bursae. Corpus bursae nearly oval, lateral half spinulose and joined with spinules of ductus bursae, expanded into centre of corpus bursae, spoon-shaped; with a long, elongate anterior appendix bursae. Seventh sternite with a pair of small proximal bag-like protrusions.

Distribution.

China (Shaanxi, Hubei).

Etymology.

This species is named from the Latin word Idaea linearis , referring to the linear postmedial line.

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 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.