Gryllotalpa permai Tan & Kamaruddin

Tan, Ming Kai & Kamaruddin, Khairul Nizam, 2016, A new species of Gryllotalpa mole cricket (Orthoptera: Gryllotalpidae: Gryllotalpinae) from Peninsular Malaysia, Zootaxa 4066 (5), pp. 552-560 : 554-557

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Gryllotalpa permai Tan & Kamaruddin

new species

Gryllotalpa permai Tan & Kamaruddin , new species

( Figs. 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 ) Orthoptera 473462

Material examined. Holotype: male (LAR. 15.114), Peninsular Malaysia, Perak, Taiping, on Bukit Larut, N 4.85710, E 100.80245, 1234 ± 6.4 m, calling underground, shaded forest, on herbs near road, 19 June 2015, 1110 h, coll. M. K. Tan, K. N. Kamaruddin, S. T. Toh, I. Abdul Rani ( ZRC).

Paratype: male (LAR. 15.219), Peninsular Malaysia, same locality as holotype, circa N 4.86364, E 100.79122, 1006 ± 6.3 m, calling underground, near stream, with rocks, boulders and logs, 21 September 2015, 1040 h, coll. M. K. Tan ( ZRC).

Diagnosis. This small species differ from all known species of Asiatic Gryllotalpa by head and pronotum orange, abdomen velvety black abdomen and legs orange.

Discussion. This species is similar to Gryllotalpa fulvipes Saussure, 1877 in general size and colouration (velvety black abdomen and orange legs). It differs by having the head and pronotum orange (instead of black in G. fulvipes ); tegmen venation, stridulatory file (more than 45 teeth compared to around 30 teeth in G. fulvipes ). This species has genitialia that distinguishes it from G. fulvipes in the following: apex of transverse sclerite (ats) with dorsal branch triangular and short (more slender and elongated in G. fulvipes ); distal margin (dmp) of epiphallus with proximal margin with two lateral fairly acute processes (absent in G. fulvipes ); shape of basal plate (Bp) of paramere (Par); internal prolongation (Ip) pointing with apex acute (instead of blunt in G. fulvipes ). This species also differ to G. fulvipes by male calling song of a higher pitch and lower pulse rate.

Description. Habitus typical of this genus ( Fig. 1 View FIGURE 1 ). Ocelli convex and medium ( Figs. 2 View FIGURE 2 A & 2 B). Pronotum ( Fig. 2 View FIGURE 2 B) oval, about 1.18 (n= 2) times longer than wide; with longitudinal medial furrow; anterior margin concave; posterior margin roundly smooth; inferior margin of lateral lobe roundly triangular at about 90 º. Anterior trochanter with process with convex ventral and straight dorsal margins; apex acute ( Fig. 2 View FIGURE 2 C). Dactyls of anterior tibiae moderately long, decreasing in size from dorsal to ventral dactyls; ventral dactyl substraight, others slightly curved; apices fairly acute ( Figs. 2 View FIGURE 2 C & 2 D). Anterior tibiae with internal tympanum slit-shaped ( Fig. 2 View FIGURE 2 C). Hind wings reduced, completely covered by tegmina. Hind femur about 1.66 (n= 2) times longer than hind tibia. Hind tibia armed with 2 internal subapical spines.

Male. Tegmen about 1.29 (n= 2) times longer than wide, reaching end of the 5 th abdominal tergite. Venation on left and right tegmina not different. Right tegmen ( Fig. 2 View FIGURE 2 E): harp (enclosed by CuA+CuPa, CuPb, c and CuPaβ; = discoidal cell) broad at base, narrowing in the basal third area (c curved and CuA+CuPa straight), with distal margin narrowly rounded, with diving vein closer to CuA+CuPa than c. Cell 1 (enclosed by c, c’ and CuPaβ) broad internally; with c and c’ parallel thereafter; laterally (or externally) truncated with c and c’ both forming right angles with CuPaβ. Cell 2 (enclosed by CuPaβ and CuPaα 2) small, elbowed in the middle, CuPaβ bent and CuPaα 2 gently curved; radius vein not diverged into RA and RP (denoted as RA+ RP). Veins CuPb and CuPaα 2 +CuPaβ do not fuse at the apex. Stridulatory file about 2.8 mm (n= 2) substraight, slightly bent in the middle, with 49 (n= 2) fairly evenly distributed and widely-spaced teeth; teeth are larger in the middle ( Fig. 2 View FIGURE 2 F).

Genitalia as shown in Fig. 3 View FIGURE 3 . Epiphallus (Epi): transverse sclerite (Ts) more of a ‘L’ shape ( Figs. 3 View FIGURE 3 A, 3 B). Base of transverse sclerite (bts) narrow, gently widening towards the apex ( Fig. 3 View FIGURE 3 B). Apex of transverse sclerite (ats) with a pair of branches; dorsal branch triangular, short, with rounded to subtruncated apex; ventral margin broadly curved; ventral branch elongated, slightly curved into an acute apex ( Figs. 3 View FIGURE 3 A, 3 B). Median prolongation of epiphallus (MP) broad; base (bmp) broad, then narrow slightly before widening again towards the apex (amp) ( Fig. 3 View FIGURE 3 A). Apex of median projection (amp) with dorsal surface spear-shaped; distal margin (dmp) truncated, proximal margin with two lateral fairly acute processes ( Fig. 3 View FIGURE 3 D). Ectophallus (Ect): basal plate (Bp) of paramere (Par) with small subacute lobe on latero-posterior margin ( Fig. 3 View FIGURE 3 C). Latero-basal plate (Lbp) transverse, gently curved along ventral margin ( Figs. 3 View FIGURE 3 A, 3 B). Anterior-apical process (Aap) stout and rounded; internal prolongation (Ip) pointing distally with apex acute ( Fig. 3 View FIGURE 3 A).

Female. Unknown.

Colouration. Head dark orange, with frons slightly darkened. Maxillary palp orange with apex and base slightly darkened. Scapus black basally, orange at apical third; antennae dark basally, orange after basal third. Pronotum orange. Abdominal tergite and tegmen velvety black, abdominal sternites orange; cercus mostly black and pale orange at the apex. Legs generally orange; dactyls in the anterior tibiae black apically.

Measurements. See Table 1 View TABLE 1 .

Etymology. This species name (noun in apposition) refers to the Malay word, Permai , meaning lovely. It reflects the colouration, rather unique among species of Gryllotalpa . The holotype was also collected near the Permai View Bungalow on Bukit Larut.

Calling song. One specimen was recorded in-situ at night (1945 hours). Calling song is a series of relatively high-pitch thrilling within a shallow burrow. Each thrill is consistently about 0.36 s (thrill rate about 2.79 s - 1). Pitch peaks at a frequency of about 3.27 kHz and pulse rate consistent of 53.2 s - 1 ( Fig. 4 View FIGURE 4 ).

TABLE 1. Measurement of males of Gryllotalpa permai sp. n. (in mm, mean values in brackets).

Holotype 21.0 7.8 5.6 8.4 6.9 11.4 6.2 3.0 53
Paratype 19.8 6.6 6.6 7.6 5.5 7.7 5.3 2.5 45
Mean (n =2) 20.4 7.2 6.1 8.0 6.2 9.6 5.8 2.8 49

Zoological Reference Collection, National University of Singapore