Ancylogastra burundiana Bassi, 2021

Bassi, Graziano, Sáfián, Szabolcs, Léger, Théo, Müller, Günter C., Kravchenko, Vasiliy D. & Poltavsky, Alexander N., 2021, Ancylogastra, a new genus of Afrotropical Crambinae, with descriptions of seven new species (Lepidoptera, Pyraloidea, Crambidae), Zootaxa 5052 (1), pp. 42-60 : 53-58

Ancylogastra burundiana Bassi , sp. n.

( Figs 7 , 16, 17 , 29, 30 )

Holotype male, with labels: 1) Holotypus; 2) Urundi [ Burundi]: Kitega [Gitega, approximatively 1500 m a.s.l. and 03°26’S, 29°54’E], 20.X.1965, Dr. M. Fontaine [legit], 3) GS 2441 GB, 4) Ancylogastra burundiana Bassi , Holotype, G. Bassi det. Deposited in RMCA .

Paratypes: 1 male, Burundi, Gitega, 29.X.1967, Dr. M. Fontaine, RCGB ; 1 female, Burundi, Gitega, 2.III.1968, Dr. M. Fontaine legit, GS 2829 GB, RMCA .

Diagnosis. In habitus the species is similar to A. ghanensis sp. n. ( Fig. 8 ) described below, but with forewing termen wider with white ground colour and abdomen paler. In the male genitalia ( Fig. 16 ) the phallus is cylindrical with an apical tooth. In the female genitalia ( Fig. 29 ), the sterigma is larger and less pointed and the ductus bursae is larger and less sclerotised. This and the next two new species described below are very close to each other in having the female genitalia with the lateral extension of the ductus bursae membranous, very short, and delicate ( Figs 30–32 ).

Etymology. The name refers to the country where the type series was collected.

Description ( Fig. 7 ). Wingspan: males 25–26 mm, female 31 mm. Labial palpi four times as long as eye diameter, brown with upper margin and tip sprinkled with white. Maxillary palpi subtriangular, brown tipped white. Antenna in male shortly bipectinate with rami one and a half times as long as flagellomere; in female simple, brown with costa bronze brown. Frons rounded, gently produced, white with brown dot medially. Ocelli normally developed. Chaetosemata minute. Vertex white. Patagia brown with scattered white scales. Tegulae pale brown. Thorax white sprinkled with brown. Forewing subtriangular, apex rounded, termen large and slightly concave medially; ground colour white with costa darker with scattered brown scales; three irregular dots medio-dorsally, antemedially and in cell; postmedial fascia silvery white, with very distinct brown serrate inner border and weakly serrate brown outer border; subterminal area white with seven subtriangular black spots; terminal line black; fringes silvery white with short scales tipped brown; underside bronze brown suffused with white. Hindwing shiny white in male, shiny white suffused with pale ivory yellow in female; fringes shiny white; underside white suffused with brown along costa. Legs bronze brown with tarsi annulated with white. Abdomen white and pale bronze brown. Tergite of male abdominal segment VIII as in Fig. 17 .

Male genitalia ( Fig. 16 ). Uncus and gnathos of equal lengths, both slightly curved distally and with narrowly rounded apex. Tegumen long and narrow. Vinculum stout, rounded. Pseudosaccus subconical. Juxta large, cupshaped. Valva simple, ventrobasally bulged, narrowing towards apex; costal arm strongly sclerotised, upcurved and apically pointed. Phallus slightly shorter than valva, almost cylindrical, with rounded apex bearing a triangular tooth; vesica with several minute scobinations.

Female genitalia ( Figs 29, 30 ). Papillae anales subrectangular. Apophyses posteriores with base strongly sclerotised, then narrow and apically slightly curved. Abdominal segment VIII more intensely sclerotised ventrally and dorsally. Apophyses anteriores longer than apophyses posteriores, narrow, slightly curved. Sterigma bulged dorsally and broadly subtriangular ventrally. Ostium bursae membranous. Ductus bursae larger than antrum, slightly longer than corpus bursae, strongly sclerotised basally, with a narrowing sclerotised band along its length, ending at inception of ductus seminalis, proximally in corpus bursae; lateral extension small, sclerotised basally and then membranous. Corpus bursae membranous with scobinations laterally and basally.

Distribution. Only known from Burundi.

Figures

FIGURES 1–8. Adults of Ancylogastra Bassi & Poltavsky, gen. n. species. A. amphiaula (Meyrick), female, Malawi, Nyika National Park. 2. A. magnifica Bassi, sp. n., male holotype. 3. A. boireaui Bassi & Sáfián, sp. n., male holotype. 4. A. gangraensis Bassi, Sáfián, Müller & †Kravchenko, sp. n., male paratype. 5. A. endroedyi Bassi, sp. n., female holotype. 6. A. coronata Bassi, sp. n., female holotype. 7. A. burundiana Bassi, sp. n., male paratype. 8. A. ghanensis Bassi, sp. n., male holotype. Scale bars = 10 mm.

FIGURES 16–24. Male genitalia and abdominal sclerotisations of Ancylogastra Bassi & Poltavsky, gen. n. species. 16. A. burundiana Bassi, sp. n., holotype; 17. The same, tergite of eighth abdominal segment; 18. A. ghanensis Bassi, sp. n., paratype GS 6220 GB; 19. The same, paratype GS 6246 GB, sternite of eighth abdominal segment; 20. The same, tergite of eighth abdominal segment; 21. A. gangraensis Bassi, Sáfián, Müller & †Kravchenko, sp. n., paratype GS 6690 GB, Guinea; 22. The same, tergite of eighth abdominal segment; 23. The same, sternite of eighth abdominal segment; 24. The same, apex of phallus magnified. Not to scale.

FIGURES 29–33. Female genitalia of Ancylogastra Bassi & Poltavsky, gen. n. species. 29. A. burundiana Bassi, sp. n., paratype GS 2829 GB; 30. The same, magnified to show the lateral extension of ductus bursae; 31. A. ghanensis Bassi, sp. n., paratype GS 6195 GB; 32. A. coronata Bassi, sp. n., holotype, magnified to show the lateral extension of ductus bursae; 33. The same, holotype. Not to scale.