Tortrilema fangae, Volynkin, 2024

Tortrilema fangae View in CoL sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:26FD7FEE-BD91-4F08-AAD9-173B8543B7F9

( Figs 11, 12 View Figures 1–12 , 23 View Figures 21–23 , 29 View Figures 27–31 )

Type material. Holotype ( Figs 11 View Figures 1–12 , 23 View Figures 21–23 ): male, “ China / WuyShan | Jiangxi – Fujian border | 50 km SE of Yingtan | 27°56'N, 117°25'E | 1600 m, March 2002 | leg. Siniaev [recte: Sinyaev] & local coll. | Museum Witt” / “Slide | CW 00097 ♂ ” [prepared by Volynkin] (MWM/ ZSM). GoogleMaps

Paratypes. CHINA: 4 males, 1 female , same data as holotype, gen. prep. No.: CW 00098 GoogleMaps ♀

(prepared by Volynkin) (MWM/ ZSM).

Diagnosis. The forewing length is 16.0–16.5 mm in males and 17.0 mm in the female. Tortrilema fangae sp. n. is externally very similar to T. lienquan and the reliable identification requires the examination of the genitalia structures. In the male genital capsule, the new species differs from T. lienquan in the proximally thicker uncus and the broader distal saccular process. The phallus of T. fangae sp. n. is distally broader than in T. lienquan . The differences between the two species are substantial in their vesica structures: T. fangae sp. n. has a strongly elongate basal diverticulum with two subdiverticula apically, one of which is elongate, utricular and recurved anteriorly while the other one is short and semiglobular, whereas the basal diverticulum of T. lienquan is short but broad and semiglobular. The distal section of the vesica of the new species is utricular and somewhat curved, shorter than the phallic tube, and has three short finger-shaped diverticula laterally whereas in T. lienquan , the distal section of the vesica is markedly longer and broader, helicoid and has a large conical apical diverticulum directed dorsally and bearing a cluster of spinulose scobination apically. Additionally, compared to T. lienquan , the apical cornutus of T. fangae sp. n. is somewhat shorter but thicker and has a broader base. The female genitalia of the new species are distinguished from T. lienquan by the longer and broader ventral plate of the ductus bursae, the more elliptical posterior gelatinous enlargement of the corpus bursae protruding latero-ventrally on the left side (it is protruding laterally to the right in the congener), and the broader but shorter diverticulum bursae situated ventrolaterally on the right side (vs. left-sided and more posterior position in T. lienquan ).

Distribution. The new species is currently known only from its type locality situated on the border of the Chinese provinces of Zhejiang and Fujian. The records of T. postmaculosa (as “ Systropha ” or “ Strysopha ”) from the same region of China (Zhejiang, Fujian and Guangdong) ( Daniel 1954; Fang 2000, partim) probably also belong to T. fangae sp. n. but require confirmation.

Etymology. The new species is named after Ms Cheng-lai Fang (Institute of Zoology Chinese Academic of Science, Beijing, China), who made significant contributions to the knowledge of Lithosiini of China in the 1980s–2000s.