Duolandrevus (Eulandrevus) hainanensis, He, Zhuqing & Ma, Libin, 2015

He, Zhuqing & Ma, Libin, 2015, A new species of subgenus Eulandrevus Gorochov, 1988 (Orthoptera: Gryllidae: Landrevinae) from China, Zootaxa 4013 (4), pp. 594-599 : 596-597

Duolandrevus (Eulandrevus) hainanensis sp. n.

( Figs. 1 , 2 A, 3A, 3C, 3E)

Type material. Holotype. male. China: Hainan, Jianfengling, Jul. 22, 2009, coll. He Zhuqing ( SNNU).

Measurements. BL 21.04, HW 5.43, PL 2.77, PW 4.91, FWL 6.78, MTL 4.58, HFL 12.59, HTL 8.75, CL>6.35 (destroyed).

Etymology. The specific epithet “ hainanensis ” refers to the location of specimen.

Diagnosis. Large body size. Elytra shorter than uncovered abdomen portions. Six oblique veins ( Fig. 2 A). Apical portions armed with reticulated veins. Both inner and outer tympanum present, oval shaped. Epiphallic lateral lobes somewhat squared apically, equipped with a denticle pointed backward (Fig. 3C).

Description. Body size large for this genus. Head large and transverse, conspicuously wider than pronotum. Occiput broad and somewhat flattened, slightly inclined to rostrum. Rostrum broad and flattened, almost equal to the width of antennal scape. Portions under antennal socket concave and flattened, and portions under eyes concave but wrinkled. Straight rostrum suture. Labrium rhombus-like, with angle lateral margins and concave apical margin. End section of maxillary palpi longer than the third, depressed and widened, with rounded apex. End section of labrial palpi longer than remainder basal sections, depressed and widened, with truncated tip. Median ocellus small and transverse oval-like; lateral ocelli large and rounded.

Pronotum short, disk almost smooth, bearing few hairs; anterior margin concave and arc-like, posterior margin straight. Pronotal disk somewhat rounded and curved to lateral lobes without lateral edges. Lateral lobes vertically short, equipped with a ridge along margin and concave at hind corner beyond the ridge. Hind wings absent. Tegmina shorter than abdomen and with 6 oblique veins; apical portions bearing reticulated veins.

Both inner and outer tympanum present on fore tibia, oval-like and inner slightly larger than the outer. Fore tibiae laterally depressed. Hind tibiae equipped with spines proximally and with spurs halfway on the proximal portion, numbered 4:5 (inner: outer); inner apical spurs longer than the outer; ventral inner apical spur shortest, median outer apical spur longest. Abdomen armed with few hairs, almost smooth. Supra-anal plate simple, trapezoid-like with straight apex. Cercus robust, pubescent. Subgenital plate simple, fusiform, with acute apex. Genitalia: Epiphallus slightly widened and constricted apically, equipped with pair of small median lobes; lateral lobes longitudinally wide and armed with somewhat squared apex, with a denticle pointed backward. Top lobe of ectoparamere large and apically truncated in lateral view, with a rather small notch beyond the small bottom lobe.

Coloration ( Fig. 2 A). Body brown-colored. Antenna, legs, cercus and bottom of abdomen light-colored.

FIGURE 3. Genitalia. A, C, E. D. (E.) hainanensis ; B, D, F. D. (E.) hongkongae . A~B, dorsal view; C~D, lateral view; E~F, ventral view.

Remarks. So far, all Eulandrevus species could be basically divided into two types from the shape of their epiphallic tips—simple rod-like and bifurcated. The new species is distinct from its relatives. Its epiphallic tip is simple but short, thick and somewhat square-like when laterally viewed, and also armed with a tooth pointed toward the head. Additionally, the new one is slightly larger than the previous, with longer elytra that reach the 5th abdominal tergite (that of D. (E.) hongkongae is just extended to the apex of the 4th tergite).

Figures

FIGURE 1. Known distribution of the Chinese Duolandrevus (Eulandrevus) species. Part of data D. hongkongae from Ma (2011) and Otte (1988).