Homogryllacris erromena Duan, Su & Shi, 2023

Duan, Yanhao, Su, Jie, Zhang, Wenxiang & Shi, Fuming, 2023, Two new species of the genus Homogryllacris (Orthoptera: Gryllacrididae) with the male of Homogryllacris irregularis Lu, Zhang & Bian, 2022 from Yunnan, China, Zootaxa 5277 (2), pp. 388-394 : 390-392

Homogryllacris erromena Duan, Su & Shi sp. nov., Chinese name ffifiÑDzdz

( Figs. 2 , 3 )

Description. Body medium-sized. Fastigium verticis about 1.5 times as broad as scape, apex obtuse. Eyes ovoid, ocelli distinct, oval. Pronotum subquadrate, anterior margin slightly protruding forward, posterior margin straight. Lateral areas of second and third abdominal tergites each with two rows of stridulatory pegs.

Wings reaching about middle of out-stretched hind femora. Tegmen: R with two branches, both forked near apical area; left tegmen: MA free from base, near basal third dividing into MA and MP; CuA forks before mid-length of tegmen into two veins, CuA1 and CuA2, anterior branch shortly fused with MP; right tegmen: MA free from base, near basal third of tegmen divides into MA and MP, then MP divides again into 2 branches; CuA undivided, free throughout; both left and right tegmina with CuP undivided; with 4 anal veins.

Legs: Fore coxa with 1 spine. Fore and middle femora unarmed on ventral surfaces; fore and middle tibiae with 4 pairs of long spines and 1 pair of short apical spurs on ventral surfaces respectively. Hind femur with 10–11 inner spines and 8–11 outer spines on ventral surface; hind tibia with 5–6 inner spines and 6 outer spines on dorsal surface, with 1 pair of apical spurs on dorsal surface; ventral surface with 1 long apical spur on inner margin, near basal area strongly curved dorsad, while outer margin with 2 apical spurs, with 1 pair of pre-apical spurs.

Male. Ninth abdominal tergite trapezoidal in dorsal view, basal area comparatively broad, narrowing. Tenth abdominal tergite very short, the middle of posterior margin with a pair of short processes, basal areas stout, apical halves gradually narrowing, apical areas sclerotized and obviously incurved, tips obliquely truncate. Cerci conical, apices rounded. Subgenital plate subquadrate, basal area slightly broad, posterior margin with a triangular notch, apices of lateral lobes slightly protruding backwards. Styli cylindrical and short, apices rounded, inserted on lateral margins of subapical area of subgenital plate.

Female. Appearance is similar to that of male. Subgenital plate nearly trapezoidal, basal area broad, then narrowing, basal half with thin transverse folds, posterior margin subtruncate. Ovipositor thin and long, straight, dorsal and ventral margins almost parallel, apex broken. Tegmen: CuA forks near basal third into two veins, CuA1 and CuA2, anterior branch briefly fused with MA and then divides, subsequently divides near mid-length of the tegmen into two parallel branches, MP and CuA1, while the posterior branch (CuA2) undivided throughout.

Coloration. Body light yellow. Inner margin of antennal socket black. Base and apex of scape, base of pedicel with dark brown spots. Eyes black, ocelli light red. Apical area of mandible black. Pronotum with dark brown rim, the midline with a broad longitudinal rosy stripe. Tegmen with rosy veins. Fore femur and tibia rosy as well as middle femur and tibia. femur and tibia. Apical halves of hind femur and hind tibia rosy. Spines on hind femur and tibia with apical areas black. Dorsal surfaces of fifth to eighth abdominal tergites rosy in middle, basal area of ninth abdominal tergite rosy on both sides.

Measurements (mm). Body: ♁22.8–23.1, ♀ 29.7; pronotum: ♁5.1–5.5, ♀ 6.1; tegmen: ♁22.9–24.2, ♀ 26.4; hind femur: ♁13.2–13.8, ♀ 15.1; ovipositor: apex broken.

Material examined. Holotype: ♁, Taiyanghe, Puer, Yunnan, 30 July, 2022, coll. Yanhao Duan and Jie Su. Paratype: 1♁, Taiyanghe, Puer, Yunnan, 29 July, 2022, coll. Yanhao Duan and Jie Su. Other specimens: 1♁ 1♀, same data as paratype .

Etymology. The name of the new species is derived from the processes on male tenth abdominal tergite stout, from Greek erromen - (stout).

Discussion. The new species is similar to Homogryllacris obtusitubera Li, Dou & Shi, 2019 based on morphology of the processes on male tenth abdominal tergite, but it can be distinguished from the latter in the following: body obviously large, body length about twice as long as that of the latter species; posterior margin of male subgenital plate with a triangular notch; female subgenital plate is of almost equal length and width, posterior margin subtruncate. Furthermore, DNA sequencing was implemented of these two species based on COI, the genetic distance between them is more than 8% (unpublished). Hence, with a combination of morphological and molecular evidence, we regard it as a new species of Homogryllacris .

Figures

FIGURE 2. Homogryllacris erromena sp. nov., male: A. face; B–C. head and pronotum: B. lateral view; C. dorsal view; D–H. apex of abdomen: D, E. apical view; F. lateral view; G. dorsal view; H. ventral view; female: I. seventh abdominal sternite and subgenital plate in ventral view.

FIGURE 3.Tegmina of Homogryllacris spp. in dorsal view: A–B. male: Homogryllacris incurva sp. nov., C–F. Homogryllacris erromena sp. nov., C–D. male; E–F. female; A, C, E. left tegmen; B, D, F. right tegmen.