Arantia

Hemp, Claudia & Massa, Bruno, 2017, Review of the African genera Arantia Stål and Goetia Karsch (Orthoptera: Tettigoniidae: Phaneropterinae), Zootaxa 4362 (4), pp. 451-498 : 455

Key to the species of Arantia

(only males, with some notes considering species known only from females)

1 Fore coxa with well developed spine on anterior side of coxa. Subgenus Goetia n. comb............................. 3

1´Fore coxa unarmed or with only traces of spines............................................................. 2

2 Tegmina broad (width> 12 mm); tegmina leathery, leaf-like. Hind tibiae curved. Subgenus Euarantia Heller. ............ 5 2’ Tegmina narrow (<12mm). Mostly medium-sized species with light green tegmina. Hind tibiae little or not curved. Subgenus Arantia Stål. ........................................................................................ 20 3. Tegmina purple. Conspicuous black spots on ventral side of femora. Central African Republic.. A. (Goetia) purpurea (Massa) 3´. Tegmina not purple, predominantly green.................................................................. 4 4. Tegmina without hexagons. Male cerci slender, dorso-ventrally compressed, with apical dent. West and Central Africa..................................................................... A. (Goetia) dimidiata Bolivar (= gestri Griffini ) 4´Veins forming hexagons on tegmina. Male cerci sinuate, tips a roundish hairy bulge. West and Central Africa............................................................................................ A. (Goetia) galbana Karsch 5 At least one ventral broad-based spine on hind femora. Lateral lobes of the ovipositor with a pointed protuberance. Cerci long, up- and in-curved, stout with a central narrowing, a spoon-like expanded apex and a sclerotized apical spine. Democratic Republic Congo, Central African Republic....................................... A. (Euarantia) marmorata Karsch 5’ Spines ventrally on hind femora of normal shape............................................................ 6 6 Abdominal tergites with small spines. Male cerci long and in-curved; a sclerotized dark bulge branches off before the upper apex, which has a long in-curved dark finger. Democratic Republic Congo, Central African Republic.............................................................................................. A. (Euarantia) congensis Griffini 6’ Abdominal tergites of normal shape...................................................................... 7 7 Male cerci club-shaped................................................................................ 13 7´Male cerci not club-shaped.............................................................................. 8 8 Male cerci undifferentiated.............................................................................. 9 8´Male cerci either with inner spine, branched or with bifid apex................................................. 10 9 Apex of male cerci flattened and tips incurved. Posterior margin of pronotum wrinkled. Mauritius Is., Indian Ocean................................................................................ A. (Euarantia) mauritiana Saussure 9`Apex of male cerci with sclerotized ridge. Cameroon, Equatorial Guinea................. A. (Euarantia) latifolia Karsch 1 10 Inner base of male cerci with one spine. Cerci stout with sclerotized ridge at inner side. Ivory Coast................................................................................................. A. (Euarantia) bispinosa n. sp. 10`Inner base of male cerci without spine.................................................................... 11 11 Midway on male cerci sclerotized inner spine. Dorsal furrow of tibiae expanded. Congo, Cameroon, Sierra Leone, Togo................................................................................ A. (Euarantia) incerata Karsch 11`Male cerci bifid...................................................................................... 12 12 Outer part of tip of male cerci sclerotized and acute, inner part broad based and with tiny sclerotized spinule. Fore tibiae pitch black in area of tympana. Pronotum with thin transverse black line where pronotum is abruptly bent, posterior part of more yellowish to whitish colour. Cameroon, Central African Republic, Angola................. A. (Euarantia) melanota Sjöstedt 12`Both tips of male cerci about the same size, sclerotized. Fore tibiae green, infumate in area of tympana. Pronotal disc uniformly green. Guinea, Sierra Leone, Togo, Ivory Coast, Cameroon, Democratic Republic Congo, Central African Republic............................................................................ A. (Euarantia) retinervis Karsch 13 On anterior margin of tegmina numerous brown to black patches or grooves between veins.......................... 14 13`Tegmina without brown to black patches between veins on anterior margin....................................... 19 14 Metazona of pronotum with a deflection at posterior part..................................................... 15 14’ Metazona of pronotum in the posterior part without deflection................................................. 16 15 Hind tibia basally not modified. Posterior margin of pronotum partly or completely brown with conspicuous white fascia or two large white patches. Central and West Africa ( Sierra Leone, Equatorial Guinea, Central African Republic and Cameroon)................................... A. (Euarantia) excelsior Karsch (= A. mammisignum Karsch = A. tigrina Bolívar ) 15’ Basally hind tibia with 3–5 closely set and enlarged spines so that this part seems expanded; marked dark brown. Posterior margin of pronotum brown with 2 small white patches. Ivory Coast................... A. (Euarantia) tibiaspinosa n. sp. 16 Posterior part of pronotum dark brown. Male cerci stout and slightly sinuous with club-shaped apex pitch black. Styli of subgenital plate present. Hind tibiae with brown markings. Cameroon, Central African Republic, Ivory Coast............................................................................................. A. (Euarantia) scurra Karsch 16`Posterior part of pronotum not dark brown but sometimes with two lateral brown patches........................... 17 17 Smaller size, ratio length/width tegmina> 4.0. Fore tibiae ivory-coloured mixed with some dark traces in the area of the tympana. Tegmina with only faintly visible 4–5 ivory or more tawny to orange spots, sometimes on dark to black ground..... 18 17’ Larger size, ratio length/width tegmina <4.0. Sometimes 2 black spots on posterior margin of pronotum. Stridulatory file short and straight, consisting of ca. 40 teeth. Widely distributed throughout West and Central Africa...................................................................... A. (Euarantia) regina Karsch (= gabunensis Brunner von Wattenwyl ) 18 Stridulatory file short, with 80–85 teeth. Stridulatory area on left tegmen as in Fig. 19 . West and Central Africa ( Cameroon, Equatorial Guinea, Central African Republic, Democratic Republic Congo, Senegal, Togo, Burkina Faso, Ivory Coast)................................................ A. (Euarantia) rectifolia Brunner von Wattenwyl (= A. accrana Karsch ) 18’ Stridulatory file long, with more than 100 teeth. Stridulatory area on left tegmen as in Fig. 20 . Central Tanzania...................................................................................... A. (Euarantia) tanzanica n. sp. 19 Inner and outer tympanum of fore tibia closed. Posterior margin of pronotum (measured at greatest distance of metazona)> 6 mm. Posterior part of pronotum with transverse dark fascia at broadest point, remaining part white. Tegmina wide> 15 mm.

Figures

FIGURES 19–20. Dorsal view of stridulatory area of Arantia (Euarantia) rectifolia (19) and A. (Euarantia) tanzanica n. sp. (holotype) (20).