Cyana triapotamia, Volynkin & Saldaitis & Müller, 2022

Volynkin, Anton V., Saldaitis, Aidas & Müller, Günter C., 2022, Two new species of the genus Cyana Walker from Myanmar, China and Vietnam (Lepidoptera: Erebidae: Arctiinae), Ecologica Montenegrina 59, pp. 1-9 : 2-4

Cyana triapotamia sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:8A7661FF-696E-46F9-B632-076D58D4C867

( Figs 1–5 , 15, 16 , 22 )

Type material. Holotype ( Figs 1 , 15 ): male, “ Myanmar (Burma), Provinz | - Kachin State, 1970m | Threeriver junktion ( Thome | Chaungn sone) Holzfäller- | camp, ca. 40km N Kanphant | N 26°23'127'' / E 098° | 39'366'' [recte: N26°23.127' E098°39.366'] / 02. 10. 2010 | leg. Michael Langer, S. | Naumann & S. Löffler ” / “Slide AV6915 ♂ | A. Volynkin ” ( WIGJ).

Paratypes: MYANMAR: 25 males and 5 females with the same data as in the holotype, gen. prep. Nos.: AV6914, AV6918 (males), AV6919 (female) (prepared by Volynkin) ( GMF-B) .

Additional material examined: CHINA: 1 male, Prov. Yunnan, Dali Bai aut. pref., Yunlong, 13 km N of Caojian, Fengshuining Mts , 2460m, 25.VII.–8.VIII.1999, Dr Ronald Brechlin leg., gen. prep. No.: MWM 34.473 (prepared by Volynkin) ( MWM / ZSM) .

Note. The single specimen from Yunnan was previously tentatively assigned with C. britomartis due to the lack of material ( Singh et al. 2020). It has somewhat smaller size (the forewing length is 18.5 mm), and somewhat broader forewings with larger black cellular spots than in the typical population from Kachin State. However, its genitalia structures display no differences from the Myanmar specimens and we hereby assign this specimen with C. triapotamia sp. n. but exclude it from the type series. To clarify the status of this population, additional material is necessary. The range of C. britomartis appears to be restricted only by the Himalaya.

Diagnosis. The forewing length is 19.5–21.5 mm in males and 23.5–24.0 mm in females. The male of the new species ( Figs 1–3, 5 ) is externally very similar to the Himalayan C. britomartis ( Figs 6, 7 ) but distinguished by the forewing having a somewhat more angular tornus (it is smooth in the congener), a somewhat darker orange colouration, and a shorter antemedial white spot along the anal margin. The female of C. triapotamia sp. n. ( Fig. 4 ) is more externally distinct from C. britomartis ( Fig. 8 ) due to its forewing with a less elongate apex, a somewhat more angular tornus, a somewhat darker orange colouration, markedly narrower white markings, and larger black cellular spots. The female of the new species is externally most similar to the Himalayan C. divakara ( Fig. 14 ) but differs in the somewhat broader forewing and the posterior black cellular spot positioned somewhat more proximally. The male genital capsule of C. triapotamia sp. n. ( Figs 15, 16 ) is similar to C. britomartis ( Figs 17, 18 ) but distinguished by the proximally broader and more distally tapered distal section of the valva, and the somewhat larger and more prominent medial crest of the valva. The vesica of the new species differs from C. britomartis in the broader main chamber, the somewhat smaller dorsal diverticulum, and the markedly smaller distal diverticulum. In the female genitalia, C. triapotamia sp. n. ( Fig. 22 ) differs from C. britomartis ( Fig. 23 ) in the markedly longer apophyses anteriores (the longest in the species complex), the posterior section of the corpus bursae lacking the left lateral gelatinous diverticulum but having an additional area of rugose sclerotisation on the right side and a narrow transverse plate medially, and the smaller signum bursae. Additionally, in the new species, the medial membranous dilated section of the appendix bursae is somewhat shorter and narrower than in C. britomartis .

Distribution. The new species is currently known only from its type locality in northern Myanmar (Kachin State).

Etymology. The specific epithet originates from the Greek ‘τρία ποτάμια’ meaning ‘three rivers’ and refers to the type locality of the species.

Figures

Figures 1–8. Cyana spp.: adults. Depositories of the specimens: 1 in WIGJ; 2–4 in GMF-B; 5–8 in MWM/ZSM.

Figures 15–18. Cyana spp.: male genitalia. Depositories of the specimens dissected: 15 in WIGJ; 16 in GMF-B; 17 and 18 in MWM/ZSM.

Figures 22–26. Cyana spp.: female genitalia. Depositories of the specimens dissected: 22 and 23 in GMF-B; 24 and 26 in MWM/ZSM; 25 in WIGJ.

Figures 9–14. Cyana spp.: adults. Depositories of the specimens: 9, 11 and 12 in WIGJ; 10 in GMF-B; 13 and 14 in MWM/ZSM.