Odontogryllodes gratus Tan et al., 2016

Tan, Ming Kai & Kamaruddin, Khairul Nizam, 2016, New taxa and notes on some Landrevinae (Orthoptera: Gryllidae) from Malay Peninsula, Zootaxa 4162 (3), pp. 559-570 : 565-566

Odontogryllodes gratus Tan et al., 2016 sp. nov.

( Fig. 4 )

Tan & Kamaruddin, 2014: 39—“unidentified nymph”

Material examined. Holotype: male (FRA.12.70), Peninsular Malaysia, Pahang, Bukit Fraser, along Mager Trail , N03.71197, E101.73460, 1295 ± 8 m, coll. M. K. Tan & S. T. Toh, 25 December 2012. ( ZRC).

Diagnosis. Male cercus with short basal internal projection. Male epiphallus with posterior margin setose; rather deeply but narrowly notched. Posteromedial epiphallic lobule raised, directed posteriorly, and with almost acute apex. Posterolateral epiphallic lobe elongated. Dorso-apical process on each posterolateral epiphallic lobe robust, sabre-shaped (almost triangular in profile), with posterior margin curved and anterior margin substraight; ventro-apical process elongated, directed posteriorly, longer than dorso-apical process, tapering into a subacute apex.

Description. Body typical of the genus: cylindrical, slightly dorso-ventrally compressed and densely pubescent ( Fig. 4 A). Head rostrum less wide than scapus, with apex truncated (in dorsal view). Maxillary palpi with apical (fifth) segment distinctly larger, broader and longer than third and fourth segments, with apex obtusely rounded; fourth segment much shorter than third segment ( Fig. 4 B). Pronotum transverse, about as wide as long; margins with strong hairs; disc with anterior and posterior margins straight, lateral lobe longer than tall. Fore tibia without tympanum. Hind tibia inner and outer margins with 5 stout articulated spurs (also known as movable spines) on each dorsal side; and 2–3 much smaller basal spines. Hind basitarsus with 3 inner and 4 outer denticles.

Tegmen extending to middle of 2nd abdominal tergite, with 9 longitudinal veins having 2nd internal (= along posterior margin) vein on dorsal field forked near base into two separate veins; stridulatory apparatus absent; dorsal fields with anal (or posterior) margin touching each other only at basal half and forming a rather broad notch at distal half; dorsal field obliquely truncated distally and with almost angular posteromedial part ( Figs. 4 D, 4E). Hind wings absent. Metanotal gland with two deep triangular depression clearly separated by a ridge in the middle; outer margins slightly rounded; anterior margin and middle ridge with long and strong hairs; posterior margin feebly concave in the middle ( Fig. 4 C). Ninth abdominal tergite transverse ( Fig. 4 F). Anal plate broadly rounded with truncated apex ( Fig. 4 F). Subgenital plate elongated, longer than broad, tapering to a narrow apex. Male genitalia as shown in Figs. 4 G–I. Male epiphallus with posterior margin setose; rather deeply but narrowly notched (when viewed dorsally) ( Fig. 4 G). Posteromedial epiphallic lobule raised, directed posteriorly, and with almost acute apex ( Fig. 4 G). Posterolateral epiphallic lobe elongated. Dorso-apical process on each posterolateral epiphallic lobe robust, almost triangular in profile, with posterior margin curved and anterior margin substraight; ventro-apical process elongated, directed posteriorly, longer than dorso-apical process, tapering into a subacute apex. Rachis (or ectophallic fold) moderately large, containing a pair of rather high plates having widely and roundly truncate apex as well as numerous very small ridges on their lateral sides ( Figs. 4 G, 4H). Formula with apodeme elongated and fairly tall (when viewed laterally), posterior apex concave (when viewed dorsally); apodeme tapering anteriorly ( Fig. 4 G).

Colouration. Generally red brown or brown. Head red brown, antenna scapus lighter brown. Gena, maxillary palpi and clypeus pale to yellow brown. Pronotum red brown. Tegmen red brown. Legs light brown. Hind femur mostly light brown, but red brown near knee; hind tibia red brown, dorsally dark brown except the basal and distal parts; hind tarsus red brown; spines on hind tibia and tarsus brown with black tips. Thoracic segments pale yellow brown. Abdominal tergites red brown and male anal platedark brown. Abdominal sternites and male subgenital plate yellow brown.

Measurements (in mm). BL = 14.6; PL = 2.7; PW = 2.7; TL = 2.4; HFL = 9.3; HFW = 3.2; HTL = 4.8.

Etymology. The species name “ gratus ” means charming and thankful, in Latin. MKT would like to express his gratitude to be able to study orthopterans in Bukit Fraser and discover a charming new species.

Figures

FIGURE 4. Odontogryllodes gratus sp. nov. male: habitus in dorsal view (A), head in lateral view (B), metanotal gland in dorsal view (C), tegmina in dorsal views (D), dissected left right tegmen (E), abdominal apex in dorsal view (F), genitalia in dorsal (G), lateral (H) and ventral (I) views. Scale bars: 10 mm (A), 1 mm (B – F), 0.5 mm (G – I).