Hexacentrus japonicus Karny, 1907

Farooqi, Mohd Kaleemullah & Usmani, Mohd Kamil, 2018, A new species and a new record of genus Hexacentrus Serville, 1831 (Orthoptera: Tettigoniidae: Hexacentrinae) from India, Zootaxa 4526 (4), pp. 547-560 : 551-553

Hexacentrus japonicus Karny, 1907

( Fig. 3, 4 , 5 )

Hexacentrus japonicus Karny, 1907 . Abh. Zool.-bot. Ges. Wien. 4(3):1–114.

Redescription. Male: Body medium sized and slender. Antennae without alternate short dark bands apically. Fastigium of vertex triangular, narrow; compressed laterally with a longitudinal median sulcus; apex obtusely rounded; base of fastigium1.67 times as wide as scapus. Fastigium of vertex separated from the fastigium of frons by a furrow. Median ocellus well developed. Eyes are globular. Pronotum saddle-shaped, dorsal region longer than wide and expanded on posterior region, slightly depressed behind first transverse sulcus; with three transverse sulci, second and third ones restricted to disc, a U-shaped sulcus is present between second and third transverse sulci, anterior dorsal margin slightly concave, with slight median excision. An hour glass like band covers the whole pronotum; median carina faintly visible. Pronotal disc flat, expanded, broadly rounded and highly rugose on posterior region; lateral lobes of pronotum inclined; longer than high; humeral sinus absent. Prosternum armed with two long, cylindrical spines; mesosternum and metasternum armed with a pair of short and thick sternite. Thoracic auditory spiracle large, oval, slightly hidden under the lateral lobe of pronotum with a tubercle at midanterior edge. Tegmina longer than hind wings. Wings reaching the middle of hind tibiae. Male tegmina broad at the middle. Stridulatory file with 27 teeth, moderately sulcate; teeth are large at middle; file gradually narrowing at distal end, abruptly narrowing with few teeth towards proximal end. Legs: genicular lobes of fore femora armed with a single spine on inner side and unarmed on outer side, mid and hind genicular lobes armed with bispinose on both inner and outer side. All femora dorsally unarmed. Fore coxae with a forward outward projecting spine. Fore femora ventrally armed with 4 to 5 minute spines with more minute spines each on inner margin and outer margin. Mid femora ventrally armed with minute spines on inner margin, 2–3 minute spines with minute spines on outer margin. Hind femora ventrally armed with 7–8 spines with minute spines each on inner and outer margin. Fore tibiae dorsally unarmed. Fore tibiae ventrally armed with 6 long, movable, outwardly bowed opposing spines decreasing in length from basally to apically each on inner margin and outer margin. The first four spines of fore tibiae on inner margin are longer than outer margin. Mid tibiae dorsally armed with two spines on right leg and a single spine present on left leg. Mid tibiae ventrally armed with 6 long, movable, outwardly bowed opposing spines decreasing in length from basally to apically each on inner and outer margin. Hind tibiae dorsally armed with 28– 30 spines on inner margin; 24–26 spines on outer margin. Hind tibiae ventrally armed with 10–12 spines increasing in length and density from basally to apically on inner margin; 12–14 spines increasing in length and density from basally to apically on outer margin. Single dorsal pair of spurs and two ventral pairs (inner small and outer large) of spurs present on the apical region of hind tibiae. Tenth abdominal tergite with median rounded excision. Supra-anal plate triangular, broader than long, apex slightly rounded. Subgenital plate long with elongated, wide, longitudinal median furrow, lateral ridges well developed, apical margin with rounded excision; styles straight, diverging apically. Cerci robust basally with a moderate tubercle on internal side, then abruptly narrowing to a small digitiform apical appendage with incurved apex.

Female: Tenth abdominal tergite with rounded median excision. Supra-anal plate triangular, short, with dorsal groove; broader than long; apex rounded. Cerci conical slightly upcurved; apex narrow. Subgenital plate triangular; apex with median rounded excision. Ovipositor slightly decurved; slightly broad at base, apex narrow.

Morphometry (length in mm)

Material Examined: India—Uttar Pradesh, Moradabad, Mangupura (28°49'22.30"N, 78°42'18.47"E), 3♂♂, 2♀♀, 25. IX. 2016, on millet, (coll. M. K. Farooqi); Bijnor, Ram Bagh (29°22'23.63"N, 78° 7'25.37"E), 3♂♂, 3♀♀, 29.IX.2016, on millet, (coll. M. K. Farooqi).

Distribution: India—Uttar Pradesh.

Elsewhere: China, Japan and Korea.

Figures

FIGURE 4. Hexacentrus japonicus. (A–Q): A—Lateral view of head and pronotum ♂, B—Lateral view of fastigium of vertex ♂, C—Dorsal view of pronotum ♂, D—Lateral view of sternum ♂, E—Dorsal view of left basal tegmen ♂, F—Dorsal view of right basal tegmen ♂, G—Stridulatory file ♂, H—Dorsal view of supra-anal plate ♂, I—Ventral view of subgenital plate ♂, J—Dorsal view of cercus ♂, K—Dorsal view of supra-anal plate ♀, L—Ventral view of subgenital plate ♀, M— Dorsal view of cercus ♀, N—Lateral view of ovipositor ♀, O—Dorsal view of fore tibia ♂, P—Dorsal view of mid tibia ♂, Q—Lateral view of hind tibia ♂.

FIGURE 5. Stridulatory file of Hexacentrus japonicus. A—Entire file, B—Enlarged fragment.