Eurycorypha binasuta, Hemp, 2017

Hemp, Claudia, 2017, New Eurycorypha species (Orthoptera: Tettigonoidea: Phaneropteridae; Phaneropterinae from East Africa, Zootaxa 4358 (3), pp. 471-493 : 472-474

Eurycorypha binasuta n. sp.

( Figs. 1–3 )

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:500276

Holotype male: Tanzania, Nguru Mountains , submontane forest above Turiani, March 2017. Depository MfN . Paratype female: same data as holotype. Depository MfN . Further paratype material: 1 male, same data as holotype ; 1 male Tanzania, Udzungwa Mountains National Park, Mangula Gate, July 2015 (CH8039). Collection C. Hemp.

Description. Male. General habitus & colour. Eurycorypha species of uniformly green colour and elongate body shape ( Fig. 1 A ). Head and antennae: Scapus green and first couple of antennal segments green then getting darker towards end of antenna; very thin and not surpassing folded tegmina. Fastigium of vertex broad, more than 3 times as wide as scapus of antenna. Fastigium of vertex meeting equally broad fastigium of frons along well developed horizontal line with well developed median sulcus; fastigium at this point bulge-like elevated, medially below this bulge ocellus is located. Face with moderately developed frontogenal carinae, of triangular shape. Eyes typical for Eurycorypha , elongate and oval, green with faint white fascia in upper part. Thorax: Disc of pronotum depressed, thus lateral edges sharp; anterior margin of pronotum shallowly and broadly incurved, while posterior margin broadly rounded. Wings: Both pairs of wings fully developed; tegmina elongate, evenly rounded at tips, about 3 times longer than broad. Alae shiny with green area near tips which surpass tegmina when folded. Stridulatory file as in Fig. 2 , almost straight at posterior part, then slightly curved and teeth getting smaller. Legs: Fore coxa with almost straight spine. Fore femora on outer side with 3 small spines, mid femora with 2 small spines and hind femora near joints to tibiae with up to three brown-tipped spines. Fore tibiae without dorsal spine. Hind tibiae with four rows of densely set short brown-tipped spines, two outer spurs and three inner apical brown-tipped spurs. Abdomen: Light green without any pattern. Last abdominal tergite differentiated into two stout processes, densely to each other set short processes ( Fig. 2 C , arrows; D). Cerci stout, slightly incurved, with apical sclerotized tooth. Subgenital plate long with median keel at posterior third, forming two laterally compressed short processes at its posterior end, without styli ( Fig. 2 B ).

Female. Similar to male but larger and more roundish ( Fig. 1 B ). Well developed ovipositor, strongly upcurved as typical for most Eurycorpyha species ( Fig. 3 A ). Subgenital plate flap-like, longer than broad with evenly rounded posterior margin ( Fig. 3 B ).

Measurements (mm).—Male (N = 2). Body length 17.1–20.5. Median length of pronotum 4.9. Posterior femur length 14.8–15.2. Length of tegmina 29.7–29.8. Width of tegmina 9.7–10.5.

Measurements (mm).—Female (N = 1). Body length 24.8. Median length of pronotum 5.0. Posterior femur length 17.0. Length of tegmina 35.3. Width of tegmina 12.6. Ovipositor 7.0.

Diagnosis. Males are well characterized by the two “nose-like” processes formed on the posterior margin of the 10th abdominal tergite. Females have a flap-like subgenital plate and can thus be distinguished from most Eurycorypha species known from East Africa with a broad and/or medially incurved or indentated subgenital plate ( E. conclusa Hemp , E. curviflava n. sp., E. flexata n. sp., E. meruensis Sjöstedt , E. pianofortis Hemp , E. pseudovaria n. sp., E. punctipennis Chopard , E. resonans Hemp , E. varia B. v. Wattenwyl). Similar to E. binasuta n. sp. are females of E. elongata n. sp. However, E. elongata seems to be restricted to the East Usambara Mountains while E. binasuta n. sp. is at present only recorded from the Nguru and Udzungwa Mountains. Also E. ligata females have a flap-like subgenital plate but have a much smaller body size than the comparatively large females of E. binasuta n. sp. Further the ovipositor in E. ligata is not as strongly up-curved and appears more slender. The subgenital plate is evenly rounded and smooth in E. binasuta n. sp. while the female subgenital plate in E. ligata is medially deeply grooved. Only E. combretoides Hemp females have a subgenital plate very similar to E. binasuta n. sp. However, the habitat in which E. combretoides occurs (savanna woodlands) is completely different. Also E. combretoides is more elongate with usually numerous black dots on the apical part of the tegmina ( Fig. 4 B ) while the only known female of E. binasuta n. sp. was uniformly green with very few scattered black dots ( Fig. 1 B ).

Etymology. Named after the two nose-like processes on the posterior margin of the 10th abdominal tergite. Distribution. Tanzania, Nguru and Udzungwa Mountains.

Figures

FIGURE 1. Eurycorypha binasuta n. sp. A. Male B. Female. This species is at present known from submontane forest of the Nguru Mountains and lowland wet forest in the Udzungwa Mountains of Tanzania.

FIGURE2. Morphological details of male E.binasuta n. sp. A. Stridulatoryfile B. Subgenital plate C, D. Semilateral view on abdominal apex. Arrows on image C point to the two processes formed on the posterior margin of the 10 th abdominal tergite. Scale bars 1 mm.

FIGURE 3. Morphological details of femaleE.binasuta n. sp. A.Lateral view on ovipositor B. Subgenital plate.

FIGURE4. A.Male E.combretoides from the Bereku Forest Reserve some 30 km south of Babati, Miombo woodland at 1600 m B. Female E.combretoides, dry deciduous forest in the North Pare Mountains at an elevation of 1250 m near the small town Lembeni.