Odontogryllodes latus Chopard, 1969

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 : 566-569

Odontogryllodes latus Chopard, 1969

( Figs. 5 , 6 C, 6D)

Tan et al., 2015: 47— Duolandrevus (Surdolandrevus) species

Material examined. 5 males, Singapore : 1 male (ZRC.ORT.210), Nee Soon swamp forest, coll. M. K. Tan, R. W. J. Ngiam & M. R. B. Ismail, 20 December 2010; 1 male ( ZRC. ORT.244), Central Catchment Nature Reserve , Upper Seletar Trail, coll. M. K. Tan, 12 March 2011 ; 1 male (ZRC.ORT.1039), Mandai secondary forest, coll. M. K. Tan & H. Yeo, 4 June 2014; 1 male (D12.B.02), Mandai secondary forest, N1.414428, E103.798, coll. M. K. Tan, 15 December 2015 ; 1 male (A58.B.13), Mandai secondary forest, N1.412564, E103.796, coll. M. K. Tan, 11 January 2016 . 2 females, Singapore : 1 female (F1.B.04), Mandai secondary forest, N1.413551, E103.7899, coll.

M. K. Tan, 9 December 2015; 1 female (B10.F.01), Mandai secondary forest, N1.415826, E103.7947, coll. M. K. Tan, 4 January 2016. (All ZRC).

Note. This species was first described from Singapore from a female. To date, the male remains unknown. From recent collection, we identified females to this species and subsequently identified and described conspecific males for the first time.

New diagnosis. This species differs from all known species by: male tegmen with dorsal field angular distally. Posterolateral epiphallic lobe with dorso-apical process sabre-shaped (triangular in profile) and having acute apex, and with ventro-apical process lobous, broad truncated.

Discussion. The males are very similar to Odontogryllodes angulatus Gorochov, 2016 ; but differ by tegmen and genitalia (see key to species of Odontogryllodes ).

First description of the male. Body typical of the genus: cylindrical, slightly dorso-ventrally compressed and densely pubescent ( Fig. 5 A). Head rostrum about as wide as scapus, with apex truncated. Maxillary palpi with apical (fifth) segment distinctly larger, broader and longer than third and fourth segments, with apex obtusely rounded; fourth segment shorter than third segment. Pronotum transverse, slightly longer than wide; its margins with strong hairs; disc with anterior and posterior margins straight, and with lateral lobe longer than tall. Fore tibia without tympanum. Hind tibia inner and outer margins with 6 stout articulated spines on each dorsal side; and with 2–5 much smaller basal spines. Hind basitarsus with 3–4 inner and 4–5 outer spines.

Tegmen extending to anterior margin of 2nd abdominal tergite, with 8–9 longitudinal veins; stridulatory apparatus absent; anal margins of dorsal tegminal fields touching each other along basal half and forming a narrow excision between distal halves; dorsal field roundly angular distally ( Fig. 5 B). Hind wings absent. Metanotal gland clearly divided by a ridge in the middle; outer margins slightly rounded; anterior margin with long and strong hairs; posterior margin feebly concave in the middle ( Fig. 5 C). Ninth abdominal tergite transverse, widely excised along posterior margin. Anal plate broadly tongue-shaped, divided into two halves by a sulcus; basal half broader, slightly swollen laterally and with two rounded depression in the middle; apical margin truncated with numerous long hairs ( Fig. 5 D). Subgenital plate elongated, narrowing to apex, with apical margin forked. Male genitalia as shown in Figs. 5 E–5G. Male epiphallus rather deep and narrowly notched (when viewed dorsally). Posteromedial epiphallic lobule rather large, directed more or less upwards ( Fig. 5 E). Posterolateral epiphallic lobe curved and more roundly truncated. Dorso-apical process on each posterolateral epiphallic lobe narrowly triangular with apex acute dorsally; ventro-apical process forming a broad truncated lobe ( Fig. 5 F). Rachis (or ectophallic fold) moderately large, containing a pair of rather high plates having widely and obliquely truncate apex as well as numerous very small ridges on their lateral sides ( Figs. 5 E, 6G). Formula with apodeme elongated; formula slightly swollen laterally before apodeme tapering anteriorly.

Colouration. Very similar to Odontogryllodes gratus sp. nov. Generally red brown or brown. Head brown, antenna scapus lighter brown. Gena, maxillary palpi and clypeus pale 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 to yellow brown. Abdominal tergites red brown and male anal plate dark brown. Abdominal sternites and male subgenital plate yellow brown.

Redescription of female. Tegmen small and round, reaching middle of 1st tergite. Anal plate transverse, roundly truncated apically. Subgenital plate transverse, broader than long, with apical margin deeply and roundly excised. Ovipositor short, barely surpassing hind knee; with acute apex and denticulate lateral edge of subapical part of each upper valve; denticulations with blunt or truncated apices ( Fig. 5 H).

Measurements (in mm). See Table 2 .

Distribution. Singapore.

The authors are grateful for Andrej V. Gorochov for the review of the manuscript prior to submission and provision of references. The authors thank Huiqing Yeo, Siew Tin Toh, Robin Ngiam Wen Jiang, Mirza rifiq bin Ismail, Yi Fei Chung and Henrietta P. M. Woo for assistance in field collection. Permission for the collection of material in Singapore was granted by the National Parks Board (NP/RP10-073). Permission for the collection of material in Peninsular Malaysia was granted by the Research Promotion and Co-Ordination Committee, Economic Planning Unit, Prime Minister’s Department (UPE: 40/200/19/2923) and supported by the Institute for Biodiversity, Department of Wildlife and National Parks (Perhilitan). The work of MKT was partly supported by Lady Yuen Peng McNeice Graduate Fellowship.

Figures

FIGURE 5. Odontogryllodes latus Chopard, 1969: male habitus in dorsal view (A), right male tegmen in dorsal view (B), male metanotal gland in dorsal view (C), male abdominal apex in dorsal view (D), male genitalia in dorsal (E), lateral (F) and ventral (G) views and female ovipositor in dorsal view (H). Scale bars: 10 mm (A), 1 mm (B – D), 0.5 mm (E – H).

FIGURE 6. Landrevinae from Singapore: Duolandrevus (Bejorama) parvulus Gorochov, 2016 male adult (A), Endodrelanva jimini s p. nov. female adult (B), Odontogryllodes latus Chopard, 1969 female adult (C) and nymph (D).

Tables

TABLE 2. Measurements of Odontogryllodes latus (in mm).

	BL	PL	PW	TL	HFL	HFW	HTL	OL
Dry-pinned
Males (n = 3)
ZRC.ORT.210	12.2	2.8	2.8	2.3	7.8	2.8	4.6	-
ZRC.ORT.244	12.1	3.1	2.7	2.4	7.7	3.0	4.7	-
ZRC.ORT.1039	12.2	3.0	3.0	2.2	7.6	2.9	4.7	-
Alcohol-preserved
Males (n = 2)
D12.B.02	12.0	2.6	2.6	2.6	8.1	3.1	4.4	-
A58.B.13	12.2	2.7	2.6	2.3	7.6	3.0	4.5	-
Females (n = 2)
F1.B.04	13.5	3.1	2.9	1.0	8.1	2.9	4.4	4.0
B10.F.01	13.0	3.2	3.1	1.1	8.0	3.1	4.4	3.9
Acknowledgements