Arantia (Goetia) dimidiata ( Bolívar, 1906 ) Hemp & Massa, 2017

Hemp, Claudia & Massa, Bruno, 2017, Review of the African genera Arantia Stål and Goetia Karsch (Orthoptera: Tettigoniidae: Phaneropterinae), Zootaxa 4362 (4), pp. 451-498 : 487-488

Arantia (Goetia) dimidiata ( Bolívar, 1906) n. comb. ( Figs. 47–48 , 70 , 102–103 )

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:500649

Bolívar (1906). Mem. Soc. espan. Hist. nat. 1: 335.

Type locality: EQUATORIAL GUINEA. Fernando Póo and CAMEROON. Depository: MNCN, Madrid. Kind of types: syntypes male and females.

Syn. Arantia gestri Griffini, 1906

Griffini (1906). Ann. Mus. Civ. Stor. Nat. Genova, 3 (2): 384.

Type locality: GABON. N’Jolè (=Ndjole). Depository: MSNG, Genoa. Kind of type: holotype male.

Material examined. EQUATORIAL GUINEA. Bioco ( Fernando Póo ), Escalera (1♂, 1♀ syntypes) . CAMEROON. L. Conradt (1♀ syntype) ( MNCN) . CENTRAL AFRICAN REPUBLIC. Dzanga-Ndoki National Park, Lake 1, (light trap) 10–11.II.2012 (1♂) ; 11–12.II.2012 (2♂); 20–23.II.2012 (3♂); 24–25.II.2012 (6♂). Ndoki, border of Lake 1 (light trap) 13–14.II.2012 (6♂). Ndoki, Lake 1 (light trap) 2, 15–16.II.2012 (4♂). Ndoki, Lake 3 (light trap) 18–19.II.2012 (1♂). Ndoki, Lake 1, platform on the canopy, 35m (light trap) 4–5.II.2012 (1♂); 10– 11.II.2012 (1♂); Ndoki, Lake 1, platform on the canopy, 45m (light trap) 28–29.II.2012 (1♂). Ndoki, saltpans 25.I.2012 (1♂), P. Moretto (BMCP). A. gestri : GABON. Ndjolé XI–XII.1902, L. Fea (♂ holotype) ( MSNG) . DEMOCRATIC REPUBLIC CONGO . Kasai, Mange, V. Ferry (1♀) ( RBINS) .

Measurements. Males. Body length: 27.0–32.0; pronotum length: 7.0–7.2; pronotum height: 5.2–6.1; hind femur: 26.0–29.0; hind tibiae: 31.0–34.0; length of tegmina: 45.0–47.0; tegmina width: 9.5–10.5 ( A. gestri : 11.8); tegmina width/pronotum length: 1.3–1.4 ( A. gestri : 1.7). Females. Body length: 25.0–27.0 ( A. gestri : 27.4); pronotum length: 6.1–6.5 ( A. gestri : 6.4); pronotum height: 5.8–6.0 ( A. gestri : 5.8); hind femur: 28.5; hind tibiae: 27.5; length of tegmina: 44.0–47.0 ( A. gestri : 49.8); tegmina width: 10.5–10.6 ( A. gestri : 11.0); ovipositor: 3.8–4.2 ( A. gestri : 3.0); tegmina width/pronotum length: 1.6–1.7 ( A. gestri : 1.7).

Characters. A. dimidiata is easily distinguished from A. galbana by the absence of hexagonal areas in the tegmina and by black spines present on the legs of A. galbana ( Karsch 1891; Bolívar 1906) (compare Figs 48 and 49 ). In addition, the cerci of A. dimidiata are long, in-curved, dorso-ventrally compressed and end with a small black spine, while those of A. galbana are sinuate and end with a round hairy bulge (compare Figs 102 and 104 ). Further, some specimens of A. dimidiata have a dark fascia on the posterior area of the pronotum, absent in A. galbana . The stridulatory file consists of ca. 55–60 teeth, the central situated teeth are broader and more spaced ( Fig. 68 ). Griffini (1906) described the male of Arantia gestri from the Democratic Republic Congo ( Fig. 47 ) and later ( Griffini 1908) the female from Mange (Kassay, Congo). A peculiar character is the black velvet color of the hind margin of the pronotum. The fore coxae are armed with a very small spine (both in the male holotype and in the female), fore femora armed with 7–9 black-tipped small spines. The outer tympanum of the fore tibia is black. The mid femora are armed with 6 small ventral spines, and the hind femora with 6–8 ventral black-tipped spines. The anterior margin of the tegmina is straight with small black spots, and the stridulatory area of the left tegmen also has small black markings, as in A. dimidiata . Further, a concavity on the lower margins of the pronotal lobes is present also in A. dimidiata . Cerci of A. gestri are long, hairy, with an enlarged apex and a very small dark spine, identical to those of A. dimidiata (compare Figs 102 and 103 ). Styli are absent. The ovipositor of the female is short and the last tergite has two tumescent bumps. A. gestri and G. dimidiata were described in the same year, thus authors of their descriptions probably were unaware of the respective described taxa. However, G. dimidiata was described on 1st August 1906, while A. gestri on 5th August 1906 (cf. Poggi 2010). Thus, A. gestri Griffini, 1906 is a junior synonym of G. dimidiata Bolívar, 1906 .

Distribution. Central and West Africa ( Cameroon, Central African Republic, Equatorial Guinea, Gabon).

Figures

FIGURES 45–50. Habitus of Arantia (Euarantia) tibiaspinosa n. sp. (45a), inset expanded spiny base at joint with femur of hind tibia (45b), A. (Euarantia) griffinii n. sp. (46), Arantia (Goetia) gestri (holotype) (= A. dimidiata) (47), A. (Goetia) dimidiata (syntype) (48), A. (Goetia) galbana (49) and A.(Goetia) purpurea (holotype) (50).

FIGURES63–71.Stridulatory files of Arantia retinervis (63), Arantia excelsior (64), Arantia scurra(65), Arantia tibiaspinosa n. sp.(66), Arantia griffinii n. sp. (67), Arantia bispinosa n. sp.(68), Arantia galbana (69), Arantia dimidiata (70) and Arantia purpurea (71).

FIGURES 96–105. Cerci of Arantia excelsior (96, 97), Arantia tigrina (= A. excelsior) (98), Arantia scurra (99), Arantia tibiaspinosa n. sp. (100), Arantia griffinii n. sp. (101), Arantia dimidiata (102), Arantia gestri (= A. dimidiata) (103), Arantia galbana (104)and Arantia purpurea (105).