Ornebius dowwiangkanae, Tan, Dawwrueng & Artchawakom

Tan, Ming Kai, Dawwrueng, Pattarawich & Artchawakom, Taksin, 2015, Contribution to the taxonomy of scaly crickets (Orthoptera: Mogoplistidae: Mogoplistinae) from Southeast Asia, Zootaxa 4032 (4), pp. 381-394 : 386-390

Ornebius dowwiangkanae, Tan, Dawwrueng & Artchawakom , new species

( Figs. 4–6 )

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:471938 Material examined. Holotype (male): Thailand, Nakhon Ratchasima, Sakaerat Environmental Research Station, main road near Upper Dam, dry evergreen forest, N14.49801, E101.91687, 501.9±7.0 m, 2 July 2014, 2228 hours, coll. M. K. Tan, H. Yeo & S. T. Toh ( SERS.14.160) ( ZRC).

Paratypes. Same locality as holotype: 1 male ( SERS.14.47), near light trap, dry evergreen forest, N14.5079, E101.92767, 417.0± 6.2 m, 24 June 2014, 2116 hours, coll. M. K. Tan, H. Yeo & S. T. Toh ( ZRC); 1 male ( SERS.14.146), 1 female ( SERS.14.147), en route Upper Dam, dry evergreen forest, N14.49681, E101.91647, 507.6± 5.1 m, 1 July 2014, 2040 hours, coll. M. K. Tan, H. Yeo & S. T. Toh ( ZRC); 2 males, main road, dry evergreen, on treelet, 400-450m, 18 January 2014, coll. P. Dawwrueng, Y. Tubsee, N. Porntanawat & O. Srinawakorn ( THNHM).

Diagnosis. This species differs from all known species by paraproct process slightly sigmoid, broadest in the middle, tapering to an obtuse apex; male phallic complex with external sclerite, basal half narrow before bent, with apical half after bent broad (weakly sclerotized between the dorsal and ventral margins); female ovipositor with dorsal apical valve shorter than ventral valve.

Description (n = 4). Habitus as shown in Figs. 4 and 5 A. Frontal rostrum 1.3 times wider than scapus, with distinct longitudinal sulcus in middle. Maxillary palps with three apical segments of subequal length, apical (= fifth) segment only slightly widened, third segment slightly longer than fourth or fifth ( Fig. 5 B). Pronotum in male about 1.2 times longer than wide with anterior dorsal margin feebly concave in middle; lateral margins widening posteriorly; posterior margin convex, barely covering base of mirror. Tegmen about 1.1 times wider than posterior area of pronotum; posterior margin convex; mirror roughly triangular, wider than long. Fore tibia with internal tympanum round to oval; without external tympanum. Hind femur 1.4 times longer than hind tibia; hind tibia 3.0 times longer than hind metatarsus.

Male. Supra-anal plate with last abdominal tergite and epiproct distinctly separated by a transverse suture ( Fig. 5 C). Last abdominal tergite transverse, slightly narrowing posteriorly; with posterior margin truncated and feebly emarginated; with dense setae along posterior margin on both side of emargination ( Fig. 5 C). Epiproct rounded, slightly less wide than posterior margin of last abdominal tergite; setose along posterior margin ( Fig. 5 C). Paraproct process medium-sized, slightly laterally compressed; slightly sigmoid, broadest in middle, tapering to obtuse apex; more setose along the dorso-external margin than along ventro-internal margin ( Figs. 5 C, 5D). Sclerotised part of male genitalia as in Fig. 6 F. Phallus with external sclerites, bent for about 90º slightly before middle; external sclerite with basal half narrow before bent, with apical half after bent broad, narrowing slightly towards an truncated apex (weakly sclerotized between the dorsal and ventral margins. Medial valve broad and little curved (when viewed laterally), with a hyaline to slightly sclerotized hook-like projection at the base.

Female (n = 1). Ninth abdominal tergite with posterior margin straight. Tenth abdominal tergite transverse; epiproct broadly rounded. Subgenital plate broader than long; apical margin roundly excised in middle; setose ( Fig. 5 E). Ovipositor with dorsal apical valve shorter than ventral valve; dorsal apical valve stout, setose along dorsal margin; ventral apical valve elongated with four bristles along ventral margin and with six large and blunt crenulation; apex obtuse ( Fig. 5 F).

Colouration. Head uniformly orange. Pronotal disc orange with white scales along apical margin. Male tegmen yellow; in dorsal view, apex with broad black margin; black band not continuing to lateral field ( Fig. 4 ). Femur pale orange. Abdomen with tergite (including abdominal apex) black, covered by yellow brown scales; sternite white except the apical sternites. Male paraproct process white. Cercus light brown.

Measurements. See Table 3 .

Etymology. This species is named after Thansuda Dowwiangkan, a friend and field assistant of PD.

Discussion. The male genitalia of this species is similar to Ornebius peniculatus Ingrisch, 2006 , Ornebius tuberculatus , Ornebius aureus from Thailand, and Ornebius cibodas and Ornebius samudra from West Java by the presence of external sclerite of lateral valve ( Fig. 6 ). This species however differs from all the above species by the supra-anal plate being setose but without strong short hairs or bristles standing together as in a brush, and by the paraproct being laterally compressed but not slender. This species is also similar to Ornebius pendleburyi Chopard, 1969 from Bukit Fraser of Peninsular Malaysia, Ornebius flori Ingrisch, 1998 and Ornebius citrus Ingrisch, 2006 from Sabah by tegmen yellow with black band along posterior margin but differ by male phallic complex (without dorso-ventrally compressed lobe of lateral valve) and paraproct process.

Figures

FIGURE 4. Ornebius dowwiangkanae sp. n. habitus (when alive) in natural environment.

FIGURE 5. Ornebius dowwiangkanae sp. n. female habitus in dorsal view (A); head and maxillary palps in anterio-lateral view (B); male abdominal apex in dorsal (C) and dorso-lateral (D) views; female subgenital plate in ventral view (E); female ovipositor in lateral view (F). Scale bars: 5 mm (A), 1 mm (B – F).

FIGURE 6. Sclerotized parts of male genitalia of Ornebius cibodas (A), O. tuberculatus (B), O. peniculatus (C), O. samudra (D), O. aureus (E) and O. dowwiangkanae sp. n. (F) in lateral views. Line drawings (A – E) from Ingrisch (2006). es = external sclerite of lateral valve; mv = medial valve of central phallic lobe, ss = spermatophore sac.

Tables

TABLE 3. Measurements of Ornebius dowwiangkanae sp. n. (in mm, mean values in brackets).

	BL	FRW	SW	PL	PW	TL	TW	HFL	HTL	HML	OL
Alcohol preserved
Male											-
Holotype	9.0	0.5	0.4	3.3	2.6	3.0	2.8	5.3	3.7	1.4	-
SERS.14.146	9.6	0.5	0.4	3.2	2.6	3.6	3.1	5.9	3.9	1.4	-
18 Jan.2014	9.9	0.5	0.4	3.3	2.6	3.8	3.0	5.7	4.4	1.4	-
18 Jan.2014	9.0	0.5	0.4	3.0	2.6	3.1	2.6	5.3	3.8	1.1	-
Mean (n=4)	9.4	0.5	0.4	3.2	2.6	3.4	2.9	5.5	4.0	1.3	-
Female
SERS.14.147	9.6	0.5	0.5	2.4	2.3	-	-	6.3	4.8	1.7	6.2
Dry-pinned
Male
SERS.14.47	?	0.5	0.4	3.3	2.4	3.3	2.7	5.5	3.9	1.2	-