Microconema arctilamina, Duan & Liu & Chang, 2022

Duan, Yanhao, Liu, Qing & Chang, Yanlin, 2022, One new species of the genus Microconema Liu, 2005 (Orthoptera: Tettigoniidae Meconematinae) from Yunnan, China, Zootaxa 5154 (1), pp. 81-86 : 82-84

Microconema arctilamina sp. nov., Chinese name K片小mā

( Figs. 1–2 )

Description. Male. Body small, comparatively stout. Head slightly hypognathous, fastigium verticis conical, apex obtusely rounded, furrowed in the midline. Eyes globular, slightly protruding forwards.Apical segment of maxillary palpus longer than subapical one, apex swollen.

Pronotum comparatively long, anterior margin straight, posterior margin obtusely rounded; lateral lobe longer than high, humeral sinus shallow. Thoracic auditory spiracle exposed, nearly peanut-shaped.

Tegmen surpassing apex of hind femur, basal area slightly broad, apical area narrowing gradually, apex obtusely rounded; almost stridulatory area of left tegmen covered by pronotum. Hind wing nearly as long as tegmen.

Forecoxa with 1 spine. All femora unarmed on ventral surfaces. Internal and external margins of ventral surface of fore tibia with 5 long spines separately, tibial tympana opened on both sides. Middle tibia with 3–6 spines on internal and external margins of ventral surface respectively. Genicular lobes of hind femur with apices obtusely rounded on both sides, hind tibia with 20–22 spines on internal and external margins of dorsal surface respectively, and 2–7 spines on internal and external margins of ventral surface separately, as well as one pair of dorsal apical spurs and two pairs of ventral apical spurs.

Tenth abdominal tergite nearly retangular, posterior margin with a pair of inconspicuous tubercles. Cercus long, stout in basal third, with a narrow lamellar extension along dorsal margin and ventral margin respectively on inner surface; middle area conspicuously curved upwards and inwards; two thirds of apical area long cylindrical, inner surface faintly flattened, apex slightly stout. Subgenital plate obviously longer than wide, furrowed in the midline, apical area with nearly quadrate area concave dorsally, posterior margin obtusely rounded. Styli short with apices obtusely rounded, directing downwards, inserted on lateral margins of subapical area of subgenital plate.

Female. Appearance is similar to that of male. Lateral area of ninth abdominal tergite slightly broadened backwards, tenth abdominal tergite narrow, split in the centre of posterior margin. Cercus short conical with apex subacute. Epiproct broad and short, posterior margin obtusely rounded. Subgenital plate broad and almost pentagonal, feebly furrowed in the midline, posterior margin emarginate. Ovipositor almost as long as hind femur, basal area slightly robust, then narrowing apically, faintly upcurved; dorsal margin smooth, ventral margin with some small blunt teeth in subapical area, afterwards with a large tooth; apex of dorsal valvula acute and apex of ventral valvula hooked.

Coloration. General color yellowish green (probably green when alive). Apex of mandible black. Eyes reddish brown. Area after eyes with a longitudinal yellow stripe separately (but in some specimens discolored). Disc of pronotum with a pair of parallel longitudinal yellow stripes. Apical area of stridulatory area of male left tegmen with a large and irregular black spot. Claw with apex brown.

Material examined. Holotype: ♂, Yaoshan, Qiaojia, Yunnan, China, 22 August, 2020, coll. Tao Wang and Qi Guo. Paratypes: 2♂, same data as holotype ; 2♀, Dongping, Qiaojia, Yunnan, China, 24 August, 2020, coll. Tao Wang and Qi Guo. Other specimens: 8♂ 7♀, Dongping, Qiaojia, Yunnan, China, 24 August, 2020, coll. Tao Wang and Qi Guo ; 9♂ 5♀, same data as holotype .

Measurements (mm). Body: ♂ 9.5–10.9, ♀ 12.6–12.9; pronotum: ♂ 3.9–4.5, ♀ 3.5–3.9; tegmen: ♂ 9.2–12.2, ♀ 10.9–13.8; hind femur: ♂ 9.1–9.5, ♀ 10.2–10.5; ovipositor: 11.1–11.4.

Etymology. The name of this new species is named for morphology of male cercus, from Latin ‘ arct -’ (narrow) and ‘ lamin -’ (lamellar).

Discussion. The new species resembles Microconema clavata ( Uvarov, 1933) , but it differs from the latter in: male cercus on inner basal area with a narrow lamellar extension on dorsal margin and ventral margin respectively; subgenital plate nearly rectangular, with a median longitudinal furrow distinctly. Ventral margin of ovipositor with some small blunt teeth in subapical area.

Figures

FIGURE 1. Microconema arctilamina sp. nov.: A–B, G–H. head and pronotum: A, G. lateral view; B, H. dorsal view; D–F. apex of abdomen: D, F. dorsal view; E. apico-lateral view; C, I. subgenital plate; J. apical area of ovipositor in lateral view; K. ovipositor in lateral view; A–C, E–F. male; D, G–K. female.

FIGURE 2. Habitus lateral view of Microconema arctilamina sp. nov., A. male; B. female.