Duolandrevus (Eulandrevus) meiacanthus Ma & Dai, 2025

Dai, Jin-Hong, Wang, Ning, Wang, Rui & Ma, Li-Bin, 2025, Duolandrevus (Eulandrevus) meiacanthus Ma & Dai, sp. nov., a new species of Landrevinae from Yunnan, China (Orthoptera: Gryllidae), Zootaxa 5566 (2), pp. 397-400 : 398-400

Duolandrevus (Eulandrevus) meiacanthus Ma & Dai , sp. nov.

( Figs. 1 , 2 )

Chinese name: 小NJ矛÷ƶ兰DZ

Specimens examined. Holotype. China: Male, Yunnan, Pingbian, Daweishan National Forest Park , 22-vi-2024, Jinhong Dai coll. ( SNNU) . Paratypes. 2 females. Yunnan, Pingbian, Daweishan National Forest Park, 22-vi-2024, Jinhong Dai coll. ( SNNU) .

Etymology. The specific epithet “ meiacanthus ” refers this species having epiphallic median lobe shaped as a small spine.

Description ( Fig. 1 ). Male. Body sized medium for this genus. Head. Head rounded and slightly wider than the pronotum. Vertex broad and flattened, weakly inclined. Frontal rostrum slightly convex in frontal view, equal to the width of antennal scape. Antennal scape transversely broad, about 1.5 times as wide as length. Eyes slightly protruding, not extending beyond the head; ocellus three, lateral ocelli ovoid and distinctly larger than the median ocellus. Postclypeus narrowly banded, and slightly narrower in the middle than laterally; anteclypeus broader, apical narrowing; labrum shaped as a shield. Maxillary palpus five, the third and fourth segments equal in length, and the apical of the fifth segment distinctly widened; labial palpus three, the third segment being as long as the first two and widening at the end. Thorax. Pronotum broad, anterior margin slightly narrower than posterior margin and slightly concave. Tegmina and wings. Forewings reaching the fifth abdominal segment, oblique veins six, the inner two slightly curved; chord veins three, second and third chord veins basally connected. Diagonal vein straight, proximally curved and connected with oblique veins. Mirror irregularly shaped and surrounded by several large wing cells. The length of cercus equal to half of the abdomen. Both inner and outer tympanum ovoid and equal in size. Legs. Posterior femur well developed, slightly shorter than the abdomen. Posterior tibiae equipped with spines on the one half of proximal portion (inside: 3-4; outside: 5) and spurs on distal part (inside: 4; outside: 4); basitarsus armed with two rows of small spines.

Genitalia. In dorsal view, basal of the epiphallus broader, and the posterior margin of the middle lobe armed with short protuberances. Lateral lobe barrow and length, distinctly enlarged subterminal and curved medially. In lateral view, the lateral lobe of epiphallus slightly curved dorsally, protuberance of middle lobe distinctly shorter than lateral lobe. In ventral view, the ectoparamere broader and about half as long as the lateral lobes.

Female. Similar to male, but larger than males and with shorter forewings covering only the first abdominal segment. Apical of ovipositor pointed, slightly longer than cercus.

Coloration. Body dark brown. Head and pronotum black, ocellus white; legs dark reddish brown, and the inner posterior femur and forewings brown.

Measurements (mm). Male (n=1): BL 18.09, HL 3.5, HW 4.6, PL 3.05, PW 4.83, FWL 7.39, HFL 10.86; Females (n=2). BL 18.04±0.17, HL 3.44±0.08, HW 5.14±0.02, PL 3.24±0.06, PW 5.01±0.16, FWL 2.32±0.24, HFL 12.20±0.08, OL 10.39±0.11.

Remarks. This new species is very similar to Duolandrevus (Eulandrevus) paradoxus ( Gorochov, 2001) . Both species have dark brown bodies, the male forewings extending to the 5th abdominal tergite, and long narrow lateral lobes of epiphallus. However, the new species is distinguished from D. (E.) paradoxus by the wider and longer basal of the epiphallus. In addition, the lateral lobe of the epiphallus of the new species are significantly longer than those of D. (E.) paradoxus . Finally, the length of the posterior marginal protuberance of the middle lobe is markedly different in the two species of epiphallus. The protuberance of the new species is about 1/5 as long as the lateral lobe, whereas the posterior marginal protuberance of D. (E.) paradoxus extends to the expansion of the lateral lobe, exceeding the length of the lateral lobe by half. Therefore, we consider this species should be treated as a species new to science.

Figures

FIGURE 1. Bodies of D. (E.) meiacanthus sp. nov. A. male; B. female; Scale bar: 10 mm.

FIGURE 2. Genitalia of D. (E.) meiacanthus sp. nov. A. dorsal view; B. lateral view; C. ventral view.