Acanthosia reducta, Volynkin, 2025

Acanthosia reducta View in CoL sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:74A0365F-A2E5-4BBF-BD29-66F1CB684BEF

( Figs 22–24 View Figures 16–30 , 102–104 View Figures 102–105 , 154 View Figures 150–155 )

Type material. Holotype ( Figs 22 View Figures 16–30 , 102 View Figures 102–105 ): male, “ Sierra Leone 120m | Tiwai Island , Moa River | N07˚33'00''; W11˚21'09'' | 17–22.vi.2016 Light Trap | leg. Takano, Miles & Goff | ANHRT:2017.18” / “ANHRTUK | 00020581” / ‘Slide | AV8971 ♂ | A. Volynkin ” ( ANHRT).

Paratypes (38 males, 28 females, all in ANHRT). SIERRA LEONE: 16 males, 2 females , same data as in holotype, gen. slide Nos: AV9026 ♀ , AV9027 ♀; 1 male, 3 females, 373m, Kono Province, Gori Hills, near Giehum , 08°27'47''N, 10°46'17''E, 3–12.ii.2020, Kalnoi, G., Sinyaev, V. leg., gen. slide No.: AV9047 ♀ GoogleMaps ; 2 males, 2 females, 375m, Kono Province, Gori Hills, near Giehum , 08°27'47''N, 10°46'17''W, 22–29.ii.2020, Kalnoi, G., Sinyaev, V. leg., gen. slide No.: AV9016 ♂ GoogleMaps ; 1 female, 685m, Kono Province, Gori Hills, near Giehum , 08°27'45''N, 10°48'07''W, 11–15.iii.2020, Kalnoi, G., Sinyaev, V. leg.; 1 female, 380m GoogleMaps , Kono Province, Gori Hills, near Giehum , 08°27'48''N, 10°46'17''W, 14–21.ii.2020, Kalnoi, G., Sinyaev, V. leg.; 1 male, 470m GoogleMaps , Kenema Province, Gori Hills, near Moimandu , 08°14'51''N, 10°58'17''W, 2–9.iii.2020, Kalnoi, G., Sinyaev, V. leg.; 1 female, 370m GoogleMaps , Kono Province, Gori Hills, near Bongema , 08°29'19''N, 10°46'26''W, 1–9.i.2020, Kalnoi, G., Sinyaev, V. leg.; 4 females GoogleMaps , same data as previous but 13–20.i.2020; 4 females GoogleMaps , same data as previous but 16– 28.xii.2019; 3 females, 385m GoogleMaps , Kono Province, Gori Hills, near Bodu , 08°28'36''N, 10°44'33''W, 21– 30.i.2020, Kalnoi, G., Sinyaev, V. leg GoogleMaps . LIBERIA: 1 male, 2 females, 585m , Lofa County, Wologizi Mts, Rosewood Camp , 8˚06'14.9''N, 9˚58'27.3''W, 18.xi.–1.xii.2018, LepiLED light trap, Sáfián, Sz., Simonics, G. leg., gen. slide No.: AV8973 ♂ ; 13 males, 4 females, 530m, Lofa County, Foya Proposed Protected Area , 7˚56'36''N, 10˚16'36''W, 10–19.xi.2017, MV (125W), 8W actinic, and cold cathode light traps, Aristophanous, M., Sáfián, Sz., Simonics, G., & Smith, L., leg., gen. slide No.: AV9028 ♀ ; 2 males, 865m, Lofa County, Wologizi Mts, Ridge camp, 807'10''N, 9˚57'11''W, 24–29.xi.2017, light trap (blended bulb 250w), Aristophanous, M., Sáfián, Sz., Simonics, G. & Smith, L. leg.; 1 male, 611m , Lofa County, Wologizi Mts , base camp forest, 8˚07'17''N, 9˚57'42''W, 20.xi.–01.xii.2017, MV light trap (125w), Aristophanous, M., Sáfián, Sz., Simonics, G. & Smith, L. leg.; 1 male, 1 female, 883m , Lofa County, Wologizi Mts., Ridge Camp 2, 8˚7'20.79''N, 9˚56'50.75''W, 22–31.xi.2018, light trap blended bulb (250W), Sáfián, Sz., Simonics, G. leg.

Diagnosis. The forewing length is 12.0– 12.5 mm in males and 12.5–14.0 mm in females. The male genital capsule of A. reducta sp. n. is similar to A. tryphosa with its strongly elongate distal saccular process but can be easily distinguished by the proximal lobe of the distal saccular process reduced to an irregularly spinulose crest and the irregularly dentate dorsal margin of the proximal section of the sacculus. In addition, the uncus of the new species is more proximally swollen and distally thicker than in A. tryphosa . The phalluses of the two species display no remarkable differences. The vesica of A. reducta sp. n. is similar to A. tryphosa but distinct with its distal diverticulum, which is longer, having small dorsal subdiverticula but lacking the distal hook-like curved lobe, and bearing a cornutus on its ventral side whereas it is situated dorsally in A. tryphosa . The female genitalia of A. reducta sp. n. differ from A. tryphosa in the narrower swollen sclerotised plates of the postvaginal region of the sterigma, the longer and ventrally sclerotised ductus bursae (it is membranous and reduced in the congener), the sclerotised posterior end of the posterior section of the corpus bursae, and the longer and anteriorly more dilated lateral sclerotised area of the posterior section of the corpus bursae, which is situated slightly more anteriorly than in A. tryphosa .

Distribution. The new species is currently known from Sierra Leone and Liberia.

Etymology. The specific epithet is derived from the Latin ‘reduco’ meaning ‘to reduce’ and refers to the reduced proximal lobe of the distal saccular process of the new species. The name is a noun in the nominative singular in apposition.