Pterotiltus bioko Oumarou-Ngoute & Rowell 2025, sp. nov.

Pterotiltus bioko Oumarou-Ngoute & Rowell sp. nov. Figs 1, 2, 3, 4, 5, 6, Tables 1, 2 Material examined. — Holotype: EQUATORIAL GUINEA, Bioko Island • ♂; Road to Ureka, Reserva Cientifica de la Caldera de Luba, Bioko Island; 03°13'3"N, 008°21'4"E; altitude 1345 m; 15-xii-2023; H. Song, R. Mariño-Pérez, J. B. Linde, B. M. Woo, & C. Oumarou-Ngoute leg.; specimen N °. 8012023 D; MfN. Paratype: EQUATORIAL GUINEA, Bioko Island • 1 ♀; Pico Basile National Park, Bioko Island; 03°23'20"N, 008°29'51"E; altitude 1374 m; 18 December 2023; H. Song, R. Mariño-Pérez, J. B. Linde, B. M. Woo, & C. Oumarou-Ngoute leg.; specimen N °. 7732023 D; MfN. Other material examined. — EQUATORIAL GUINEA, Bioko Island; H. Song, R. Mariño-Pérez, J. B. Linde, B. M. Woo, & C. Oumarou-Ngoute leg. (36 ♂, 24 ♀) • 9 ♂; road to Ureka, Reserva Cientifica de la Caldera de Luba; 03°13'3"N, 008°21'4"E; altitude 1345 m; 15 December 2023; specimens N ° 7972023 D 7942023 D 7962023 D 7952023 D 7992023 D 7982023 D 8002023 D 8022023 D 8032023 D; ONC • 1 ♂; same information as previous; 03°12'57"N, 008°21'11"E; altitude 1370 m; specimen N ° 8122023 D; ONC • 2 ♂; same information as previous; 03°20'09"N, 008°35'07"E; altitude 1204 m; specimens N ° 7852023 D 7862023 D; ONC • 9 ♂, same information as previous; 03°12'7"N, 008°21'4"E; altitude 1192 m; specimens N ° 8452023 D 8312023 D 8332023 D 8342023 D 8372023 D 8322023 D 8362023 D 8352023 D 8462023 D; ONC • 3 ♀; same information as previous; 03°13'3"N, 008°21'4"E; altitude 1345 m; specimens N ° 7932023 D 7892023 D 7902023 D; ONC • 3 ♀; same information as previous; 03°20'09"N, 008°35'07"E; altitude 1204 m; specimens N ° 7792023 D 7812023 D 7832023 D; ONC • 10 ♀; same information as previous; 03°12'7"N, 008°21'4"E; altitude 1192 m; specimens N ° 8302023 D 8292023 D 8222023 D 8212023 D 8242023 D 8272023 D 8282023 D 8232023 D 8252023 D 8262023 D; ONC • 1 ♂; same information as previous;,, 03°13'3"N, 008°21'4"E; altitude 1345 m, specimen N ° 8382023 D; RC • 3 ♂: Pico Basile National Park, 03°38'53"N, 008°49'45"E; altitude 1374 m; 18 December 2023; specimens N ° 7702023 D 7712023 D 7722023 D; ONC • 7 ♂; Lago Biao, Reserva Cientifica de la Caldera de Luba; 03°21'20"N, 008°37'17"E; altitude 1831 m; 16 December 2023; specimens N ° 8082023 D 8092023 D 8112023 D 8072023 D 8052023 D 8062023 D 8042023 D; ONC • 2 ♂; same information as previous; 03°13'3"N, 008°21'4"E; altitude 1345 m; specimens N ° 7842023 D 7802023 D; RC • 3 ♀; Pico Basile National Park; 03°38'53"N, 008°49'45"E; altitude 1374 m; 18 December 2023; specimens N ° 7742023 D 7752023 D 7762023 D; ONC • 5 ♀; same information as previous; 03°22'33"N, 008°28'48"E; altitude 1864 m; N ° 8392023 D 8402023 D 8432023 D 8422023 D 8442023 D; ONC • 1 ♂; same information as previous;; 03°38'53"N, 008°49'45"E; altitude 1374 m; 18 December 2023; specimen N ° 7692023 D; ONC • 1 ♂; Lago Biao, Reserva Cientifica de la Caldera de Luba; 03°21'20"N, 008°37'17"E; altitude 1831 m; 16 December 2023; specimen N ° 8102023 D; RC. Type locality. — Reserva Cientifica de la Caldera de Luba, Bioko Island, EQUATORIAL GUINEA. Etymology. — Toponymic, referring to Bioko Island, Equatorial Guinea. Description. — (Figs 1 – 6, Tables 1, 2). Male. Body of small size, average length of body 14.22 mm (Table 1); fastigium of vertex rounded or roughly pentagonal in dorsal view with a medial carina, its tip merging smoothly with frontal ridge. Frons slightly oblique; frontal ridge shallowly sulcate above medial ocelli, obliterated below; antennae longer than the combined length of head and pronotum together; eyes protuberant, inter-ocular space slightly wider than antennae scape. Pronotum dorsally crossed by three deep sulci; medial carina very weak or absent. Space between sulci 2 and 3 almost equal to or slightly wider than metazona in length; metazona short, accounting for less than 25 % of the pronotum length (Fig. 3 A). Lateral margins of prozona tuberculate in dorsal view, anterior margin of prozona slightly convex, sometimes slightly notched in the midline. Posterior margin of metazona slightly convex and notched in the midline; prosternal process conical, vertical, pointed. Mesosternal space slightly longer than wide, lobes rounded; metasternal space open, about half of mesosternal space; micropterous. Tegmina minute, lobiform, shorter than, reaching, or barely exceeding middle of metathorax but not reaching mesothorax (Fig. 3 B). Hind femur slender, 5 times longer than wide (Table 1); 6 to 7 external tibial spines, 8 to 9 internal tibial spines (Table 1), external apical spine present; paired internal tibial spurs longer than external spurs. Tympanum wide, oval or rounded. Last abdominal tergite divided, the hind margin with two small lobiform processes forming a minute furcula, the tips separated by 0.3–0.35 mm (Fig. 3 D, E), cercus compressed laterally, slightly incurved, slightly shorter than or exceeding the tip of the subgenital plate, with acute apex. Supra-anal plate triangular in dorsal view with acute or slightly rounded apex; proximally in the plate there is a short medial longitudinal groove bounded posteriorly by a curved transverse ridge that extends across the width of the plate (Fig. 3 D). Phallic complex (Figs 4 A, B, 5 A, B) of large size for the genus, ectophallic membrane coarsely stippled and obscures most of the sclerites; epiphallus with large forwardly curved blade-like outer lophi; inner lophi absent (Figs 4 C, D, 5 C, D). Anterior processes of epiphallus well developed, axially large and rounded, ancorae absent (Figs 4 C, D, 5 C, D). Oval sclerites large with pronounced pointed tubercles on their ventral surfaces (Fig. 4 F); valvular plate foliose, showing large lobes that dorsally join the cingulum by a well-prolonged arch. Cingular apodemes dorsally blade-like, incurved (Fig. 5 E); cingular ramus laterally large, prolonged and rounded (Fig. 5 F). Endophallic apodemes dorsally slender, laterally large, spatula shaped, with robust, long and pointed gonopore processes; endophallic process terminates on the ventral aedeagal sclerite which forms a part of the ventral aedeagal valve (Fig. 5 G). Female. In general, similar to the male. Female particularities: body of small to medium size, average L = 18.11 mm (Table 1). Lateral margins of prozona less tuberculate in dorsal view; last abdominal tergite short, divided, but the hind margin without a furcula. Cercus robust, very slightly compressed laterally almost conical, straight or very slightly excurved, equaling or slightly exceeding the supra-anal plate, with acute apex; supra-anal plate triangular in dorsal view, elongated, lingulate, with rounded apex. Ovipositor valves smooth, slender, long, with rounded apex; subgenital plate ventrally conical, distally with a medial groove bounded laterally by two inflated ridges, not projecting posteriorly beyond the posterior edge of the plate. Egg-guide slender, rod-like, long, about half of the ventral ovipositor valves in length (Fig. 3 C). Dorsally, subgenital plate smoothly triangular, terminated by a straight and pointed egg guide at the tip; a pair of large sclerotized columellae that are prolonged by a pair of less sclerotized stripes (Fig. 6 A). Bursa copulatrix large, dorsally with a longitudinal groove separating the bursa into two somewhat distinct lobes (Fig. 6 B, C), spermathecal duct long; spermatheca with a hooked terminal ampulla and a developed lateral diverticulum (Fig. 6 B, D). Sexual dimorphism. — (Table 1) The average length of pronotum (P) of males is 82 % of that of females. The male antennae are longer than those of females (after normalization, the ratio of male / female Ant = 1.23). In the males, the interocular space (IOS) is smaller than in the females (male / female IOS = 0.68, and 0.82 after normalization). Breadth of fastigium (Fast-B) is slightly shorter in males than in females (male / female Fast-B = 0.73, and 0.89 after normalization). There are generally less internal tibial spines in males than in females (male / female medians = 0.82) (Table 1). After normalization, the ratios of the various other body dimensions are closely similar in both sexes (Table 1). Coloration. — (Fig. 2 A – F). Male. Body multicolored, predominantly black; scape and pedicel of antennae light green. First two or three segments of flagellum green, tip white or light green, the remaining segments brown. Fastigium of vertex green or green-black; vertex black, eyes black fading to brown when dried. Frons yellow-white; genae black in upper half and yellow-white or yellow in inferior half; clypeus, labrum, and palps green with whiter mottling. Pronotal disc black with a wide yellow patch at the anterior margin of prozona; metazona dorsally yellow; tegmina yellow; mesothoracic and metathoracic tergites black. Pronotal lobes black with two yellow patches, one in the antero-basal edge joining the yellow tripe of the genae, another at the postero-basal edge behind the third sulci of pronotum (in some specimens, the last yellow patch can join dorsally the yellow metazona to form a single stripe). Prosternum, mesosternum, and metasternum light-green; fore and middle femora orange-green, tibiae and tarsi orange-green fading green-brown or brown when dried. Hind femora orange-green; hind knee brown, upper lobes of hind knee brown, lower lobes brown-green. Hind tibiae and tarsi light green with black spines; tergite of first abdominal segment black, with paired yellow patches at the posterior margin; tergites 2 and 3 black; tergite 4 yellow-green or green or orange-green; all other abdominal segments green or orange-green. Female. We observed two different female morphotypes: All are green but some (the majority) have red patches in pronotal lobes (Fig. 2 C), the rest have yellow patches. The yellow-patched females looked newly molted (Fig. 2 D), suggesting that the color difference is developmental and that mature females are all red. Body multicolored, predominantly green, fading