Gastroplakaeis alena, Prozorov & Saldaitis & Yakovlev & Volkova & Sulak & Prozorova & Revay & Müller, 2024

Prozorov, Alexey M., Saldaitis, Aidas, Yakovlev, Roman V., Volkova, Julia S., Sulak, Harald, Prozorova, Tatiana A., Revay, Edita E. & Müller, Günter C., 2024, Two new sister species of Gastroplakaeis: G. lidia and G. alena (Lepidoptera, Lasiocampidae, Lasiocampinae, Selenepherini), Ecologica Montenegrina 72, pp. 178-188 : 184-188

Gastroplakaeis alena sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:8AFEA59E-3B70-4FE2-AF1D-2421BC74A42E

( Figs 5–6 , 9 , 13 )

Holotype: ♂, DRC, Mai- Ndombe , Ekongo camp, 2.75613 S, 20.31538 E, 350 m, XI.2017, leg. A. Prozorov, T. Prozorova et al., GS 0706 ( CGM / USTTB) . Paratypes: ♂, DRC, Equateur Province, Moliba, Bikoro , 20.VII.1991, Ph. Oremans, GS 000005070 ( RMCA) ; ♀, DRC, Lualaba, Kafakumba , IV.1935, leg. F. G. Overlaet ( RMCA) .

Description. Male upperside ( Fig. 5–6 ). Antennae, head, and thorax dark brown with straw speckles. Abdomen orangish straw with wide transversal dark brown stripes. Forewing. Forewing length: around 28 mm. Narrow, elongated, somewhat of oval shape with blunt apex and slightly wavy outer margin. Of dark brownish yellow color with dark brown speckles, external field darker than basal and medial ones; doubled wavy dark brown or black antemedial line, more or less pronounced pale discal dot with thick dark brown or black contour, and vague crenulated dark brown postmedial line are pronounced. Fringe brownish yellow with dark brown speckles. Hindwing. Somewhat trapezoid with slightly wavy outer margin. Coastal field speckled brown and yellow, medial field brown with darker field near orangish anal field and darker marginal field. Fringe speckled dark brown and yellow. Genitalia ( Fig. 13 ). Tegumen helmet-like with very small nipple-like laterodorsal pair of outgrowths. Socii cone-shaped. Vinculum medially split into a pair of elongated somewhat triangular projections. Valvae short, cone-shaped, apically blunt. Juxta an oval plate surrounding aedeagus. Aedeagus claw-like with tiny vesica. Eighth sternite is trapezoid with two big dents and smaller ones on caudal margin between them, laterobasal apodemes long. Female ( Fig. 9 ) remind male in pattern. Thorax brownish yellow medially and dark brown with pale speckles around. Abdomen brown. Forewing. Forewing length: 51.5 mm. Wide, semilanceolate with slightly wavy outer margin. Of brownish yellow color with brown speckles, doubled wavy faded dark brown medial lines and large somewhat round black medial spot with slightly darkened field under it pronounced. Hindwing. Somewhat trapezoid with slightly wavy outer margin. Of brown color with yellow speckles in costal field and brownish yellow outer margin. Genitalia not studied.

Diagnosis. Differs from other Gastroplakaeis by large discal spot with pale center, contrasting basal and medial fields of male, brownish yellow coloration of female and sexual dimorphism in coloration, not only in size. Adult males of G. alena are overall lighter ( Figs 5–6 ), have better pronounced dorsolateral outgrowths of tegumen ( Fig. 13 ), female is overall darker and larger ( Fig. 9 ), and the species is spread eastwards the Dahomey Gap; whereas adult males of G. lidia sp. n. are overall darker ( Figs 3–4 ), have barely pronounced dorsolateral outgrowths on tegumen ( Fig. 11 ), female is overall lighter and smaller ( Fig. 8 ), and the species is spread westwards the Dahomey Gap.

Distribution. Eastern Congolian swamp forests, Central Congolian lowland forests and Central Zambezian wet miombo woodlands in DRC. The new species originates from the rich Congolian forests, from where we described 48 other lasiocampid species, ( Zolotuhin & Prozorov 2010; Prozorov & Zolotuhin, 2012 a, 2012b; Prozorov, 2016 a, 2016b; Prozorov & Zolotuhin, 2016; Prozorov et al., 2021 a, 2021b, 2023 a, 2023b, 2023c, 2023d, 2024; Sulak et al., 2024; Tejuoso et al., 2024; Friend et al., 2024).

Biology. Adults were collected in IV, VII, XI from altitudes up to 350 meters a.s.l. Preimaginal stages unknown.

Etymology. The new species is named in honour of Alena Kazakevich (Lida, Belarus), for her deep understanding and support of the entomological activities of the second author. The name is a feminine noun in apposition.

Acknowledgments

We thank Manfred Ströhle (CMS), Joël Minet (MNHN), and †Ugo Dall’Asta (RMCA) for providing material and helping to process it.

We are thankful to †Vasiliy D. Kravchenko (Tel Aviv University, Israel) for preliminary work in the Ekongo camp in March and April of 2017: setting up most traps, training local workers, and taking care of material under harsh conditions. We express our gratitude to the LuiKotale Bonobo Project leaders Barbara Fruth and Gottfried Hohmann for their help with the general curating of the insect collection from the project in Ekongo. A heartfelt thank you to LuiKotale and Ekongo camp managers Roman Keller and Alexis Louat who helped to organize, manage and maintain the daily work efforts in the camp. We appreciate the irreplaceable help of the Bekombo village people with collecting, sorting, packing, and transporting insects from Ekongo as well as with the daily routine in the camp.

A portion of the presented work was done by Alexey Prozorov with the financial support of the Thomas-Witt-Stiftung.

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Figures

Figures 1–6. Adult ♂ of Gastroplakaeis spp. 1–2. G. forficulatus, Ghana, Bunso Arboretum, GS 2011-21 (RMCA). 3–4. G. lidia sp. n., Ivory Coast, Lamto (RMCA). 3. HT, GS 000005079. 4. PT. 5–6. G. alena sp. n., DRC. 5. HT, Ekongo camp, GS 0706 (CGM/USTTB). 6. PT, Bikoro, GS 000005070 (RMCA). Scale bar – 1 cm.

Figures 7–9. Adult ♀ of Gastroplakaeis spp. 7. G. forficulatus, Ghana (MfNB). 8. G. lidia sp. n., PT, Ivory Coast, Lamto, GS 000005072 (RMCA). 9. G. alena sp. n., PT, Zambia, Kafakumba (RMCA). Scale bar – 1 cm.

Figures 10–13. Genitalia of Gastroplakaeis spp. 10. G. forficulatus, Ghana, Bunso Arboretum, GS 2011-021 (RMCA). 11–12. G. lidia sp. n., Ivory Coast, Lamto (RMCA). 11. HT, GS 000005079. 12. PT, 000005072. 13. G. alena sp. n., HT, DRC, Ekongo camp, GS 0706 (CGM/USTTB). Scale bar – 1 mm.