Bryanellocoris wakaharai, Ban & Szx & Cmos & Vhx-, 2020

Ban, Teruaki, Szx, Olympus, Cmos, Color & Vhx-, Keyence, 2020, The discovery of the genus Bryanellocoris from Laos, with description of a new species (Heteroptera: Rhyparochromidae), Acta Entomologica Musei Nationalis Pragae 60 (1), pp. 169-172 : 170-172

Bryanellocoris wakaharai sp. nov.

(Figs 1–12)

Type material. HOLOTYPE:, LAOS: Oudomxay Prov.: / 11 km Southeast From Oudomxay:/ Lak 11 Water Fall / 20°37′N, 102°00′E / alt. 837 m / 4.x.2009 / G. ÔISHI leg.( TUA) . PARATYPES (11 9 ♀♀). LAOS: 3 2♀♀, same data as holotype, G. Ôishi leg. ( TUA); 8 7 ♀♀, same data as holotype, T. Ban leg. ( NMPC, TUA).

Differential diagnosis. Recognized among congeners of Bryanellocoris by a combination of the following characters: Head dark reddish brown, antennal segment II twice as long as segment I, antennal segment IV with proximal pale band, labium reaching mesocoxae, labial segment I longer than the other labial segments, apex of carina of humeral angle acute, profemur armed with two large spines. This new species is the most similar in general appearance to B. hebridensis and B. pilosus , but can be distinguished from the latter by a combination of the following characters: Antennal segment II twice as long as segment I (in B. pilosus antennal segment II 1.5 times longer than segment I); length of setae of antennal segment I shorter than diameter of antennal segment I (in B. pilosus length of setae of antennal segment I longer than diameter of antennal segment I); basal one-fifth of antennal segment IV brownish yellow and brown in remaining part (in B. hebridensis antennal segment IV uniformly reddish brown); labium reaching front edge of mesocoxae (in B. pilosus labium reaching front edge of metacoxae); ventral surface of mesothorax matte gray (in B. hebridensis dark reddish brown and in B. pilosus blackish brown); corial pale spot within apical dark spot absent (in B. hebridensis corial pale spot within apical dark spot present); profemur with 2 spines (in B. hebridensis profemur usually with 3 or 4 spines); brown annulation of tibiae present (in B. hebridensis brown annulation of tibiae absent).

Description. Male. Coloration. Head (Fig. 1) dark reddish brown. Short decumbent setae on juga golden. Antennal segment I reddish brown, segments II, III and basal one-fifth of segment IV brownish yellow, apical four-fifths of segment IV brown. Labium yellowish brown; segment II pale yellow; segment IV dark brown in apical one-third. Pronotal collar brown. Pronotum (Fig. 1) dark reddish brown in anterior lobe and yellowish brown in posterior lobe, with dark spot in each humeral area. Venter of mesothorax and metathorax matte grey; peritreme dull reddish brown. Scutellum (Fig. 1) dark reddish brown, with small white spot on apex. Corium subhyaline, with brownish spot in basal one-fourth and apical one-sixth, and with pale brownish maculation in basal half to three-fourths; clavus yellowish brown, with dark spot on apex; membrane hyaline, with pale brownish marking arranged transversely in middle. Coxal cavity brown; coxae bright brown; trochanter yellow; femora yellow, with broad subapical brown annulation in apical one-third; tibiae yellow, with dark brownish annulation subbasally and on apex; tarsomere I and II yellowish brown, with dark spot on apex of tarsomere I; tarsomere III brown. Abdominal sternum reddish brown (Figs 2–3); trichobothria of abdominal segment V and anterior trichobothriumof segment VI pale brown. Long decumbent setae on abdominal sternum golden.

Structure. Body length 3.2 times as long as width across humeri. Head as long as wide, covered with fine punctures; juga with decumbent setae; vertex flat, covered with sparse erect setae and fine punctures. Eyes moderate in size, not stalked. Antennal segments sparsely covered with setae; segment I as long as scutellar length; proportional length of antennal segments I to IV 1.0: 2.2: 1.7: 1.7. Labium reaching front edge of mesocoxae (Figs 2–3); proportional length of rostral segments I to IV 1.7: 1.6: 1.1: 1.0.

Pronotum (Fig. 1) 1.3 times as wide as long, covered with punctures and short suberect setae, without median hornlike process; with distinct transverse impression in basal twofifths, and with lateral margins weakly carinate; pronotal collar without punctures; posterior lobe 1.5 times as long as anterior lobe, distinctly tumid, apex of carina of humeral angle of pronotum acute (Fig. 1); posterior margin almost straight. Scutellum triangular, as long as wide, covered with fine punctures, with Y-shaped carina in middle. Hemelytra (Fig. 1) exceeding apex of abdomen; corium covered with sparsely erect setae and punctures; claval suture 1.2 times longer than apical margin of corium. Each femur slender; profemur ventrally armed with two large spines in about apical one-third to one-fourth; tarsus and apical one-third of each tibia densely covered with erect setae.

Abdominal sternum densely covered with decumbent setae.

Genital structures of paratypes: Pygophore (Fig. 4) globose, covered with relatively dense, erect setae; lateral margin of dorsal pygophore opening rounded, its posterior margin and cup-like sclerite not fused. Paramere (Figs 5–8) sparsely covered with erect setae; apex of outer projection rounded; apex of inner projection pointed. Phallus as in Figs 9 and 10; conjunctiva approximately of same length as phallotheca, tubular, without wrinkles or processes; sperm reservoir as in Fig. 11.

Female. General aspect as in male.Abdominal sternite VI strongly bent (Fig. 3). Ovipositor truncated at about sternite VI (Fig. 3). Spermatheca as in Fig. 12.

Measurements. Males (n = 11, holotype in parentheses) / females (n = 9). Body length 4.40–4.80 (4.80) / 4.60–5.35; body height between coxae and dorsum 1.20–1.40 (1.40) / 1.30–1.45; head length 0.70–0.85 (0.75) / 0.75–0.85; head width across eyes 0.70–0.83 (0.80) / 0.75–0.86; interocular space 0.40–0.47 (0.42) / 0.44–0.50; eye length 0.18–0.24 (0.21) / 0.24–0.28; length of antennal segments I – 0.60–0.70 (0.66) / 0.55–0.68, II – 1.20–1.43 (1.43) / 1.15–1.40, III – 0.95–1.20 (1.10) / 0.85–1.10, IV – 1.10–1.25 (1.15) / 1.05–1.25; length of labial segments I – 0.47–0.54 (0.50) / 0.44–0.53, II – 0.40–0.48 (0.48) / 0.36–0.49, III – 0.28–0.35 (0.33) / 0.30–0.35, IV – 0.26–0.34 (0.3) / 0.24–0.33; mesal pronotal length 0.95–1.13 (1.13) / 1.05–1.20; posterior pronotal width 1.28–1.45 (1.45) / 1.38–1.65; mesal scutellar length 0.60–0.75 (0.68) / 0.65–0.75; basal scutellar width 0.60–0.75 (0.68) / 0.65–0.85; hemelytral length 3.05–3.40 (3.40) / 3.20–3.80; maximum width across hemelytra 1.15–1.35 (1.35) / 1.43–1.65; corium length 2.25–2.45 (2.38) / 2.30–2.75; length of claval suture 0.48–0.55 (0.50) / 0.50–0.60; length of ovipositor 0.84–0.95.

Etymology. This species is dedicated to Mr. Hiroyuki Wakahara, a resident of Vientiane, who kindly helped me with my fieldwork.

Biological notes. Specimens were collected with several other rhyparochromid species from a mountainous forest along a mountain stream.

Distribution. Laos (Oudomxay Prov.).