Randallopsallus malayanus, Yasunaga & Duwal & Jsps, 2017

Yasunaga, Tomohide, Duwal, Ram Keshari & Jsps, 2017, Two new species of the phyline plant bug genus Randallopsallus from Southeast Asia (Hemiptera: Heteroptera: Miridae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57 (2), pp. 457-471 : 469-470

Randallopsallus malayanus sp. nov.

( Figs 6–8, 14 , 18, 19, 22, 25 , 33–35 , 41–43 , 64 )

Type material. HOLOTYPE: J, MALAYSIA: PERAK: Taiping, Bukit Larut (Maxwell Hill), N4.8625 E100.8000, 1100 m, at mercury light, 13 Jul 1989, T. Yasunaga ( AMNH) ( AMNH _ PBI 00380575 ) . PARATYPES: MALAYSIA: PERAK: Same data as for holotype, 1 J ( TYCN) ( AMNH _ PBI 00380576 ) ; same data, except for date 7 Dec 1989, 1 ♀ ( TYCN) (00380577) . PAHANG: Fraser’s Hill , N3.71, E101.73, 6 Jan 1997, S. Gotoh, 1 ♀ ( TYCN) (00380583) .

Differential diagnosis. Similar in general appearance to R. berastagi and R. paracastaneae , from which this new species can be distinguished by the characters in the key (1st couplet), generally smaller size (Table 1), uniformly darkened, short antennal segment II that is distinctly shorter than twice the length of segment III, almost entirely dark antennal segment III, relatively light brown hemelytron ( Fig. 6 ), well splayed-out left paramere and medium-sized right paramere ( Fig. 33 ), broad, winged secondary blade of endosoma ( Fig. 35 ), and enlarged, rectangular sclerotized ring ( Fig. 41 ).

Description. Macropterous; body generally smoky brown, ovoid, somewhat elongate; dorsal surface weakly shining, with uniformly distributed, reclining, silky setae intermixed with uniformly distributed, brownish setae. Head smoky brown, with rather uniformly distributed, short, slivery, reclining setae; vertex in female narrowly pale brown along inner margin of eye ( Fig. 19 ); clypeus slightly produced and pointed in front. Antenna dark brown; segment II almost uniformly darkened; extreme base of segment III yellowish brown. Labium shiny reddish brown; apical half of segment IV darkened. Pronotum relatively shining; scutellum brown, lighter than pronotum; pleura chocolate brown; ventral margin of propleuron yellowish brown; scent efferent system pale grayish yellow, subtriangular, with a small, ear-like process posterior to ostiole ( Fig. 14 ). Hemelytron somber brown, paler than pronotum; cuneus somewhat tinged with red; membrane including veins pale smoky brown, semitransparent. Coxae and legs somber brown; bases and apices of pro- and mesocoxae more or less pale brown; apical 1/3 of each femur and all tibiae yellowish brown; tibial spines dark brown; tarsi pale brown; proportion of metatarsomeres I–III = 10: 15: 16. Abdomen dark brown, with ventral median part somewhat paler ( Figs 7, 8 ). Male genitalia ( Figs 33–35 ): Left paramere splayed-out, with a sharp hypophysis ( Fig. 33 ); right paramere not enlarged as seen in R. paracastaneae ( Figs 29 vs. 33); apex of phallotheca distinctly keeled ( Fig. 34 ); endosoma distinct in form, strongly bifurcate, with secondary blade winged and spinulate from middle to apex ( Fig. 35 ). Female genitalia ( Figs 41–43 ): Sclerotized ring widened, rectangular ( Fig. 41 ); medioventral extension of ventral labiate plate similar to R. berastagi ( Fig. 39 ) but more inflated and bulbous apically ( Fig. 43 ).

Measurements. See Table 1.

Etymology. Named for the type locality of this new species, Malaya ( Malaysia); latinized as an adjective.

Collecting circumstances. This new species was collected at a mercury light trap, facing toward a dense, primary tropical rain forest.

Distribution. West (Peninsular) Malaysia (Pahang and Perak) ( Fig. 64 ).

Figures

Figs 1–6. Habitus images of phyline plant bugs, live adult individuals. 1 – Randallopsallus paracastaneae Yasunaga, 2013 (all attracted to UV light trap) (SERS, Thailand), 2–3 – Hypseloecus castaneus Yasunaga, Yamada & Artchawakom, 2015 (2 – J, Chaiyaphum, Thailand; 3 – ♀, Nakhon Nayok, Thailand), 4 – Sthenaridea piceonigra (Motschulsky, 1863) (J, Yangon, Myanmar), 5 – Psallus edoensis Yasunaga & Vinokurov, 2000 (♀, Tokyo, Japan).

Figs 6–17.Habitus images of Randallopsallus spp. (6, 9, 10 – dorsal, 7, 8, 12–13 – ventral, 14–17 – left lateral views). 6–8, 14 – R. malayanus sp. nov. 9–10, 15 – R. berastagi sp. nov. 11–13, 16–17 – R. paracastaneae Yasunaga, 2013.

Figs 18–27. Randallopsallus spp., head in frontal view (18–21), scent efferent system (22–24), and pro- (27), meso- (26) and metatarsus (25). 18, 19, 22, 25 – R. malayanus sp. nov.; 20, 23, 26 – R. berastagi sp. nov.; 21, 24, 27 – R. paracastaneae Yasunaga, 2013.

Figs 28–35. Randallopsallus spp., male genitalia. 28–32 – R. paracastaneae Yasunaga, 2013: 28 – pygophore in dorsal view, 29 – right paramere, 30 – left paramere, 31 – phallotheca, 32 – endosoma; 33–35 – R. malayanus sp. nov.: 33 – apex of pygophore in dorsal view, 34 – phallotheca, 35 – endosoma.

Figs 36–47. Randallopsallus spp. and Hypseloecus castaneus Yasunaga, Yamada & Artchawakom, 2015, female genitalia: 36–40 – R. berastagi sp. nov.: 36 – bursa copulatrix in dorsal view, 37 – ditto in ventral view, 38 – sclerotized ring, 39 – medioventral extension of ventral labiate plate, 40 – posterior wall; 41–43 – R. malayanus sp. nov.: 41 – bursa copulatrix in dorsal view, 42 – posterior wall, 43 – medioventral extension of ventral labiate plate; 44–46 – R. paracastaneae Yasunaga,2013:44 – posterior wall, 45 – bursa copulatrix in dorsal view, 46 – medioventral extension of ventral labiate plate; 47 – Hypseloecus castaneus: bursa copulatrix in dorsal view. Scale bars 0.2 mm.

Fig. 64. Distribution map for species of Randallopsallus.