Cyana (Cryptanaema) ngata, Volynkin & Černý & Vos, 2022

Volynkin, Anton V., Černý, Karel & Vos, Rob De, 2022, Two new species of the subgenus Cryptanaema de Vos of the genus Cyana Walker from eastern Indonesia (Lepidoptera: Erebidae: Arctiinae: Lithosiini Nudariina), Zootaxa 5178 (1), pp. 81-91 : 83-84

Cyana (Cryptanaema) ngata sp. n.

( Figs 1, 2 , 13 , 19 )

Type material. Holotype ( Figs 1 , 13 ): male, “ Indonesia, Irian Jaya | 25 km S Manokwari, Arfak Mts. | Ngat Biep, river Ngat valley | 250m, 17. XII. 1993, Sekundärveg. [secondary vegetation] | leg. R.Brechlin & K.Cerny ” / ‘Slide | AV5533 ♂ | A. Volynkin ” ( MWM / ZSM, ex CKC).

Paratypes: INDONESIA: 14 males, 3 females, same data as holotype, gen. prep. Nos.: MWM 33.482 (male) and AV5534 (female) (prepared by Volynkin) ( CKC and MWM / ZSM) ; 5 males, Irian Jaya, Birdshead Peninsula, Warkapi (nr Breie ), primary lowland forest, 500 m, at light, 12.XI.1993, A.J. de Boer, A.L.M. Rutten & R . de Vos. [leg.], unique numbers: RMNH .INS.1108918, 1108919, 1108920, 1108921, and 1108465 ( RMNH); 1 male, Papua Barat, Onin Peninsula, Werba , 106 m, 2°53’20”S 132°13’00”E, 31.X.2014, at light, S. & J. Sinnema, F. Groenen & P.J. Zumkehr leg., unique number: RMNH.INS.1108466 ( RMNH) ; 1 male, Irian Jaya, Birdshead Peninsula, Arfak Mts, 300 m, Warmare Dua , 0°58’S 133°53’E, 27.II.1996, at light, primary forest/cultiv. area, ZMA-exp. 1996, unique number: RMNH .INS.1108464 ( RMNH); 1 male, Irian Jaya, Birdshead Peninsula, Gng [Mount] Bembab 350 m, 1°26’S 134°11’E, 2.III.1996, at light, primary/secondary forest, ZMA-exp. 1996, unique number: RMNH . INS.1108922 ( RMNH).

Diagnosis. The new species ( Figs 1, 2 ) is superficially reminiscent of C. punctistrigosa ( Figs 4–6 ) but distinguished by its somewhat smaller size and a number of details in the forewing pattern. The male of C. ngata sp. n. differs from C. punctistrigosa in the medial line with a narrower gap in the cell and a subcostal spot positioned more distally, and the less dentate postmedial line with a posterior section smoothly curved inwards whereas it is curved outwards in the congener. Additionally, the spots and shades in the postmedial area of the new species are markedly smaller than in C. punctistrigosa . The female of C. ngata sp. n. differs from that of C. punctistrigosa in the cell lacking the elliptical spot in the gap of the medial line, the postmedial cellular spots positioned somewhat more inwardly, and the interrupted subterminal line, which is continuous and sinuous in the congener. Compared to C. devriesi ( Fig. 3 ), the male of C. ngata sp. n. is larger, has a broader forewing lacking the small elliptical spot in the cellular gap of the medial line, and a narrower terminal shade of the hindwing. The male genital capsule of C. ngata sp. n. ( Fig. 13 ) differs from that of C. devriesi ( Fig. 14 ) in the more elongate distal section of the valva, and the longer and basally broader ampulla (in proportion to the valva width). Compared to C. punctistrigosa ( Fig. 15 ), the male genital capsule of the new species has a slightly thicker uncus, broader arms of the tegumen, narrower arms of the vinculum, a medially broader valva, and a slightly longer and medially wider ampulla (in proportion to the valva width). The phallus of C. ngata sp. n. is similar to that of C. devriesi and differs from that of C. punctistrigosa in the significantly broader distal section bearing a row of tiny denticles latero-ventrally. The vesica structure of the new species is clearly different from that of C. punctistrigosa and is similar to C. devriesi . However, the vesica of C. ngata sp. n. is much broader than in the congener and differs from it in the markedly larger subbasal diverticulum bearing a broader cluster of scobination, the much longer and broader dorsal diverticulum bearing more numerous cornuti, and the longer and broader ventral diverticulum bearing a longer cluster of more numerous cornuti. Since the female of C. devriesi is unknown, the female genitalia of C. ngata sp. n. ( Fig. 19 ) are compared only with C. punctistrigosa ( Fig. 20 ). The posterior section of the corpus bursae of the new species is broader than in C. punctistrigosa and weakly sclerotised whereas it is spinulose in the congener.Additionally, the signum bursae of the new species is markedly shorter than in C. punctistrigosa , and the appendix bursae is shorter and distally narrower (in proportion to the ovipositor size).

Description. External morphology of adults ( Figs 1, 2 ). Forewing length 10.5–11.0 mm in males and 13.0 mm in female. Antenna weakly ciliate in both sexes, pale coffee brown proximally and dark brown medially and distally. Sexual dimorphism limited: female with somewhat broader forewing than in male, larger cellular spots with elliptical proximal one, larger shade-like postmedial spots of forewing, and paler hindwing with posteriorly broader terminal band. Head monotonous pale coffee brown. Thorax pale coffee brown with two trapezoid dark brown spots medially; patagia edged with dark brown scales. Forewing with rounded apex and medially convex anal margin. Forewing ground colour pale coffee brown, pattern dark brown. Subbasal spot transverse dash-like, curved outwards along vein R. Antemedial line sinuous, interrupted into series of irregular spots. Medial line broad, dilated posteriorly and interrupted in cell. Cell between medial and postmedial lines with two small spots posteroproximally and anterio-distally. Postmedial line curved anterio-medially, diffuse with small cuneal spots on veins. Postmedial area with broad and diffuse dark brown shade subapically and two smaller and diffuse spots opposite cell and posteriorly. Terminal line interrupted into spots between veins, indistinct at tornus. Forewing cilia monotonous pale coffee brown. Hindwing ground colour pale ochreous-yellow. Discal spot dash-like, fuscous, indistinct. Terminal band fuscous, strongly dilated at apex and indistinct at tornus. Hindwing cilia fuscous with admixture of ochreous-yellow scales. Abdomen ochreous-yellow basally and distally and fuscous medially. Male genitalia ( Fig. 13 ). Uncus elongate and slender, laterally flattened, slightly down curved medially and apically pointed. Tuba analis broad (ca. 2/3 of tegumen length), with thin and weakly sclerotised scaphium and broad setose subscaphium. Arms of tegumen somewhat dilated posteriorly. Vinculum more or less equal in length to tegumen, U-shaped, with thin but well-sclerotised arms. Valva lobular, dilated medially, with distally tapered, down curved and apically pointed distal section. Ampulla broadly triangular with slightly curved apical section and pointed tip, directed ventrally-inwards. Sacculus narrow (ca. half of basal section of valva width), with extremely short, protrusion-like distal process. Juxta broad but short, falcate. Phallus long and broad (in proportion to genital capsule size), straight, slightly dilated medially. Vesica broad (in proportion to phallus and genital capsule size), with large digitiform subbasal diverticulum bearing cluster of spinulose scobination distally. Ventral diverticulum broadly conical and medially curved, directed ventrad, granulose anteriorly and with cluster of numerous short triangular cornuti of various sizes posteriorly, and with short semiglobular granulose lateral subdiverticulum. Dorsal diverticulum sausage-shaped, directed anteriad, granulose with cluster of numerous short triangular cornuti of various sizes outwardly. Vesica ejaculatorius narrowly tubular, directed dorsad, with thin plate-like basal plate. Female genitalia ( Fig. 19 ). Papilla analis broadly trapezoid with rounded corners, setose. Apophyses elongate and thin, equal in length, anterior one thinner than posterior one. Ostium bursae with membranous margins. Ductus bursae membranous, tubular, dilated anteriorly. Posterior section of corpus bursae broad (in proportion to ovipositor width), moderately sclerotised, rugose, with three clusters of short spinulose scobination. Anterior section of corpus bursae narrower than posterior one, semiglobular, membranous, with bilobate and strongly dentate signum anterio-laterally. Appendix bursae short and narrow (in proportion to corpus bursae), conical and apically curved, membranous, positioned postero-laterally on right size.

Distribution. Known only from its type locality in the Arfak Mountains ( Indonesia, Western New Guinea).

Etymology. The specific epithet originates from the type locality, Ngat River. The name is a noun in apposition.

Figures

FIGURES 1–6. Cyana (Cryptanaema) spp.: adults. Depositories of the specimens: 1 in MWM/ZSM (ex CKC); 2 and 5 in CKC; 3 in RMNH; 4 and 6 in NHMUK (©The Trustees of NHMUK).

FIGURES 13–15. Cyana (Cryptanaema) spp.: male genitalia. Depositories of the specimens dissected: 13 in MWM/ZSM (ex CKC); 14 in RMNH; 15 in CKC.

FIGURES 19–22. Cyana (Cryptanaema) spp.: female genitalia. Depositories of the specimens dissected: 19 and 22 in CKC; 20 in NHMUK (©The Trustees of NHMUK); 21 in MWM/ZSM.