Cyana meiomena, 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 : 8

Cyana meiomena sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:A6D385CC-EFA7-47CC-9EE7-C51249DE4309

( Figs 9, 10 , 19 , 24 )

Type material. Holotype ( Figs 9 , 19 ): male, “C[h]ina NW Yunnan | Tuguancun | road Zhongdian- Lijiang | May 25–29, 2004 | Huang leg.” / “Slide | AV6913 ♂ | A. Volynkin ” ( WIGJ).

Additional material examined: VIETNAM: 1 female, Mt. Fan-si-pan, W side, Chapa , 22°20'N 103°40'E, 1600–1800m, IX.1994, gen. prep. No.: AV6917 (prepared by Volynkin) ( GMF-B) .

Note. The single female from Northern Vietnam matches the male holotype due to its relatively small size and geography. However , without additional materials of opposite sex either from Yunnan or Vietnam, it is impossible to assign this female with the male holotype with sure therefore we hereby not designate it as paratype.

Diagnosis. The forewing length is 17.0 mm in the male holotype and 22.0 mm in the possible female. The male of C. meiomena sp. n. ( Fig. 9 ) is externally reminiscent of C. triapotamia sp. n. ( Figs 1–3, 5 ) but distinguished by the markedly smaller size, and the less elongate forewing with the more angular tornus. The possible female of the new species ( Fig. 10 ) differs from C. triapotamia sp. n. ( Fig. 4 ) in the smaller size, the more distally positioned distal cellular black spot, the broader antemedial white stripe along the costal margin, and the broader discal white area fused with the white stripe on the costal margin (they are separated from each other in the congener). The male genital capsule of C. meiomena sp. n. ( Fig. 10 ) is most similar to C. triapotamia sp. n. ( Fig. 15, 16 ) but differs in the proximally narrower uncus, and the somewhat shorter medial crest of the valva. In the vesica, C. meiomena sp. n. differs from C. triapotamia sp. n. in the longer and broader main chamber with the more elongate medial diverticulum, the broader dorsal diverticulum, and the longer and trapezoidal distal diverticulum (it is conical in the congener). Compared to C. britomartis ( Figs 17, 18 ), the vesica of C. meiomena sp. n. has a more elongate distal diverticulum, a markedly narrower dorsal lobe of the dorsal diverticulum, and a somewhat narrower and trapezoidal distal diverticulum (it is conical in C. britomartis ). The possible female genitalia of the new species ( Fig. 24 ) are reminiscent of C. britomartis ( Fig. 23 ) but distinguished by the smaller lateral diverticulum of the corpus bursae, the narrower sclerotised area at the base of the appendix bursae, and the presence of two longitudinal sclerotised stripe-like plates in the corpus bursae at the junction with the ductus bursae. Additionally, in the possible C. meiomena sp. n., the dilated membranous section of the appendix bursae is somewhat narrower than in C. britomartis .

Distribution. The new species is known from Southwest China (Yunnan Province) and Northern Vietnam (Lào Cai Province).

Etymology. The specific epithet originates from the Greek ‘μειωμένο’ meaning ‘reduced’ and refers to the relatively small size of the species.

Figures

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.

Figures 19–21. Cyana spp.: male genitalia. Depositories of the specimens dissected: 19 and 20 in WIGJ; 21 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 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.