Pachyna arienne, Prozorov & Saldaitis & Volkova & Prozorova & Revay & Yakovlev & Sulak & Petrányi & Müller, 2023

Prozorov, Alexey M., Saldaitis, Aidas, Volkova, Julia S., Prozorova, Tatiana A., Revay, Edita E., Yakovlev, Roman V., Sulak, Harald, Petrányi, Gergely & Müller, Günter C., 2023, Two new species close to Pachyna satanas from the Congolian forests (Lepidoptera, Lasiocampidae, Lasiocampinae), Ecologica Montenegrina 69, pp. 107-116 : 109-112

Pachyna arienne sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:4C95E6F8-E859-4C1A-9137-384C7B8180E5

( Figs 6–7 , 14 , 17–18 )

Holotype: ♂, DRC, Congo River, 10 km SE Kisangani, Mbiye Island , 0.45674 N, 25.28209 E, 420 m, 24.II.2008, leg. A. Gurkovich & V. Zolotuhin, GS 0185 ( CGM / USTTB) . Paratypes, DRC: 11♂, DRC, Mai-Ndombe, Ekongo camp, 2.75613S, 20.31538E, 350 m, XII.2017, leg. A. Prozorov, T. Prozorova et al., GS 0871 ( CGM / USTTB) ; ♂, DRC, Kongo Central, Mayumbe, Luki Nature Reserve , 5.45 S, 13.08333 E, 250 m, 29.XI.2008, leg. J. & W. de Prins, GS 000005056 ( RMCA) .

Description. Male ( Figs 6–7 ). Flagellum covered with speckled brown and dark brown scales. Head, thorax and abdomen dark brown. Forewing. Forewing length: 24–26 mm. Long, semilanceolate with bunt apex. Background color dark brown. Pattern consists of diagonal contrasting lines. Fringe dark brown. Hindwing. Somewhat tapezoid with concave outer margin. Background color and fringe dark brown. Genitalia ( Figs 14 , 17 ). Vinculum a narrow band slightly widening medially. Socii papilla-shaped, sclerotized and covered with setae. Cucullus elongated, finger-shaped with blunt apex, covered with setae. Sacculus elongated, slightly longer than cucullus, c-shaped, densely covered with setae, apically bears small dents. Juxta nearly reduced, medioventrally fused with aedeagus. Aedeagus c-shaped with large ventroapical spur. Vesica large, trapezoid, dorsally has two short extensions. Vinculum ventrally elongated, bears cubile. Cubile clearly divided medially into a pair of somewhat triangle processes with mediodistal spur. Female remains unknown.

Diagnosis. Adult males of P. arienne sp. n. are very dark brown with concave external margin of hindwings ( Figs 6–7 ), have large vesica, large ventroapical spur in aedeagus, and fully split lobes of cubile ( Figs 14 , 17 ), while adult males of P. subfascia are brown with convex dentated external margin of hindwings ( Fig. 1 ), have small vesica, brely pronounced spur in aedeagus, and fused lobes of cubile ( Fig. 10 ).

Adult males of P. arienne sp. n. are very dark brown with concave external margin of hindwings ( Figs 6–7 ), have large vesica, large ventroapical spur in aedeagus, and fully split lobes of cubile ( Figs 14 , 17 ), while adult males of P. bogema are brown with convex external margin of hindwings ( Fig. 2 ), have small vesica, small ventroapical spur in aedeagus, and half-fused lobes of cubile ( Fig. 12 ).

Adult males of P. arienne sp. n. are very dark brown with concave external margin of hindwings ( Figs 6–7 ), have large vesica, large ventroapical spur in aedeagus, and fully split lobes of cubile ( Figs 14 , 17 ), while adult males of P. ckabik are brown with convex dentated external margin of hindwings ( Fig. 3 ), have small vesica, small ventroapical spur in aedeagus, and fused lobes of cubile ( Figs 15–16 ).

Adult males of P. arienne sp. n. have large vesica, large ventroapical spur in aedeagus, and fully split lobes of cubile ( Figs 14 , 17 ), while adult males of P. satanas have small vesica, small ventroapical spur in aedeagus, and partly fused lobes of cubile ( Fig. 13 ).

Adult males of P. arienne sp. n. have overall larger genitalia, straight apex of cucullus, long sacculus, large vesica, and large ventroapical spur in aedeagus ( Figs 14 , 17 ), while adult males of P. stella sp. n. have overall smaller genitalia, bent apex of cucullus, short sacculus, small vesica, and proportional spur in aedeagus ( Figs 15–16 ).

Distribution ( Fig. 18 ). Congolian coastal forests, Central Congolian lowland forests and Eastern Congolian swamp forests in DRC.

Biology. Adults were collected in February and November from an altitude of 350–420 meters a.s.l. Preimaginal stages unknown.

Etymology. The species is named in honor of Arienne Taormina (Nesconset, USA).

Figures

Figure 18. Collecting sites of Pachyna spp. Circle with star is for the HT, other tags are PT.

Figures 1–9. Adult ♂ of Pachyna spp. 1. P. subfascia, Equatorial Guinea, Mbini (MfNB). 2. P. bogema, HT, Cameroon, Ebogo, GS 2006-25 (RMCA). 3. P. crabik, HT, unknown location (NHML). 4–5. P. satanas, DRC, Isiro (RMCA). 4. HT, GS 2006-46. 5. PT. 6–7. P. stella sp. n., DRC. 6. HT, island Mbiye, GS 0185 (CGM/USTTB). 7. PT, Luki Nature Reserve, GS 000005056 (RMCA). 8–9. P. arienne sp. n., DRC, Ekongo camp (CGM/USTTB). 8. HT, GS 0794. 9. PT, GS 0795. Scale bar – 1 cm.

Figures 10–14. ♂ genitalia of Pachyna spp. 10. P. subfascia, Burundi, Gitega, GS 2006-70 (RMCA). 11. P. crabik, HT, unknown location, GS 1408 (NHMUK). 12. P. bogema, Cameroon, Nkolmetet, GS 2013-087 (ZSM). 13. P. satanas, HT, GS 2006-46 (RMCA). 14. P. stella sp. n., DRC, Luki Nature Reserve, GS 000005056 (RMCA). Scale bar – 1 mm.

Figures 15–17. ♂ genitalia of Pachyna spp., DRC (USTTB). 15–16. P. arienne sp. n., Ekongo camp. 14. HT, GS 0794. 15. PT, GS 0795. 17. P. stella sp. n., island Mbiye, GS 0185. Scale bar – 1 mm.