Dialarnaca longicerca Shi & Bian

Shi, Fu-Ming, Bian, Xun & Guo, Li-Ying, 2016, First record of the genus Dialarnaca Gorochov, 2005 from China, with description of two new species (Orthoptera, Gryllacrididae, Gryllacridinae), ZooKeys 558, pp. 1-8 : 3-4

Taxon classification Animalia Orthoptera Gryllacrididae

Dialarnaca longicerca Shi & Bian sp. n. Map 1, Figs 1-11, 18-19

Type material.

Holotype: male, pinned, China, Hainan, Changjiang, Bawangling, 26 May 2014, coll. by Jiao Jiao. Paratypes: 1 male and 1 female, pinned, China, Hainan, Changjiang, Bawangling, 13 July 2010, coll. by Ming Qiu and Rui-Lian Li.

Diagnosis.

This species differs from the Dialarnaca roseola Gorochov, 2005 in body green, male cerci longer and apical area curled, posterior margin of male subgenital plate slightly concave in the middle, styli shorter.

Description.

Male. The following characters are in addition to those given in the generic description. Fastigium verticis broad, about 1.5-1.7 times as wide as scape (Fig. 2). Eyes ovoid; ocelli inconspicuous. Scape about as long as length of eyes, pedicel approximately half as long as scape (Fig. 2). Anterior margin of pronotum projected in the middle, posterior margin almost truncate, lateral lobes longer than high (Figs 1, 3). Hind femora with 5-6 spines on internal margin of ventral surface, external margin with 6-8 spines; tibiae with 5-6 spines on internal margin and seven spines on external margin of dorsal surface. Apical area of ninth abdominal tergite with 1 tubercular process in the middle, which slightly directing downwards; posterior margin of tenth abdominal tergite with one pair of long triangular hooks in the middle, which curved upwards, its apices directing forwards (Figs 4-6, 18-19). Cerci about 4.3-4.4 mm, longer than in other species of the genus, apical area curly, apices obtuse (Fig. 5). Subgenital plate broader than long, anterior margin nearly straight, posterior margin slightly concave in the middle; styli about 0.23-0.24 mm, shorter than in other species of the genus, cylindrical, located on lateral margins of subgenital plate near apex (Fig. 4).

Female. Differs from male in following characters: cerci slender, apices acute. Seventh abdominal sternite long, both sides of four fifths apical area slightly concave, posterior area projecting backwards, centre of posterior margin slightly concave (Figs 10-11). Subgenital plate longer than broad, basal area semimembranous, with abundant fine stripes, posterior margin obtuse-angular. Ovipositor longer than hind femora, distinctly upcurved, apices obliquely roundly cutting (Fig. 10).

Coloration. Body green. Eyes black-brown. Apices of hooks of tenth abdominal tergite blackish.

Measurements

(mm). Male: body w/wings 33.2-34.0, body w/o wings 18.7-20.5, pronotum 4.5-5.0, tegmen 28.7-29.2, hind femur 11.8-12.4; female: body w/ wings 34.0, body w/o wings 21.2, pronotum 5.3, tegmen 28.0, hind femur 11.7, ovipositor 14.0.

Distribution.

China (Hainan).

Etymology.

The name is derived from the longer cerci of male.