Arantia (Arantia) orthocnemis Karsch, 1890

Hemp, Claudia & Massa, Bruno, 2017, Review of the African genera Arantia Stål and Goetia Karsch (Orthoptera: Tettigoniidae: Phaneropterinae), Zootaxa 4362 (4), pp. 451-498 : 461

Arantia (Arantia) orthocnemis Karsch, 1890 ( Figs. 8 , 77 )

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:464832

Karsch (1890). Entom. Nachricht., 16 (23): 357.

Type locality: CAMEROON. Barombi Station . Depository: MfN, Berlin. Kind of type: syntypes male and female.

Material examined. CAMEROON. Barombi Station, Preuss (1♂, 1♀ syntypes) . (1♂, 1♀). Mundame, L. Conradt; Cameroon, Victoria (1♀). Isanga Lobaje Eays, Jainide , X.1894, G. Tessmann (1♀) ( MfN). (1♂, 1♀) ( MNCN). Mukonje Farm, R. Rohde (1♂, 1♀) ( MSNG). Mundame (2♂). Mukonje Farm, R. Rohde (4♂, 3♀) ( RBINS). DEMOCRATIC REPUBLIC CONGO . Congo, Urw.-Mawambi 1910, Grauer (2♂) ( NMW).

Tegmina width: 9.8–11; tegmina length/width: 4.6; tegmina width/pronotum length: 1.5 ( Heller et al. 2014).

Characters. A. orthocnemis is a species of medium size (body length ♂ 31 mm, ♀ 34 mm) ( Fig. 8 ). Karsch (1890) described both sexes from Barombi Station ( Cameroon). Sjöstedt (1902) recorded it from Itoki ( Cameroon), Bolívar (1906) from Fernando Póo ( Equatorial Guinea), Griffini (1908) from Mukonje Farm ( Cameroon) and Bruner (1920) from Lolodorf ( Cameroon). It has narrow tegmina with reddish or ivory to white coloured spots, and with basal black markings. Tarsi in most specimens are black. Fore femora with 5–8 inner ventral spines (1 specimen from Mundame has 5 spines on the left femur, while the right is unarmed), mid femora are unarmed, hind femora with 6 outer and 8 inner ventral spines. Male specimens are easily distinguished from other Arantia species comparing the male cerci. The bases are swollen and a sclerotized ridge stretches from the base to the apex at the inner side. Basally at the inner side of the cerci a process is present, armed with an almost circular sclerotized ridge ( Fig. 77 ). Styli well developed. The ovipositor has two lateral protuberances. The subgenital plate of the female is short and slightly pointed.

Affinities. Karsch (1889) and Griffini (1908) pointed out its affinity with A. hydatinoptera . A. orthocnemis has morphologically completely different male cerci while in A. hydatinoptera the male cerci are apically compressed and the tips incurved and a basal process is lacking as well as the inner sclerotized ridge. A. hydatinoptera is probably more closely related to A. leptocnemis . A. orthocnemis has almost identical male cerci as A. dentata (see above).

Distribution. Widespread in Central and Western Africa ( Cameroon, Democratic Republic Congo, Equatorial Guinea).

Figures

FIGURES 8–11. Habitus of Arantia (Arantia) orthocnemis (syntype) (8), A. (Arantia) manca (holotype) (9), A. (Arantia) gracilicercata (holotype) (10) and A. (Arantia) hydatinoptera (syntype) (11).

FIGURES72–84.Cerci of Arantia angustipennis (72a) and original drawing of Chopard (1954) (72b), Arantia ivoriana n. sp. (dorsal and ventral view) (73a, 73b), Arantia fatidica (dorsal and lateral view) (74a, 74b), Arantia brevipes (75), Arantia dentata (76), Arantia orthocnemis (77), Arantia manca(lateral and dorsal view) (78a, 78b), Arantia gracilicercata (dorsal and lateral view) (79a, 79b), Arantia hydatinoptera (80), Arantia leptocnemis (81), Arantia simplicinervis (82), Arantia quinquemaculata n. sp. (83a, 83b), and Arantia bispinosa n. sp. (dorsal view and lateral view of left cercus) (84a, 84b).