Perittopus laosensis Ye & Bu, 2020

Ye, Zhen, Qiao, Mu, Jin, Zezhong & Bu, Wenjun, 2020, Notes on the genus Perittopus Fieber, 1860 (Hemiptera: Heteroptera: Veliidae with descriptions of three new species from Indochina, Zootaxa 4858 (3), pp. 417-426 : 419-420

Perittopus laosensis Ye & Bu , sp. n.

( Figs. 2 , 5, 7, 10, 12 , 15, 18 , 21, 24, 27, 28 , 30 , 32 )

Type material. Holotype: apterous female, LAOS, Oudomxay Province, Muang Xai , KMLL waterfall (20°37'N, 102°02'E), 20 November 2018, Zhen Ye leg. ( NKUM) . Paratypes: 2 females and 2 males, apterous, 2 females and 2 males, macropterous, same data as holotype ( NKUM) .

Diagnosis. P. laosensis sp. n. seems to be closely related to P. falciformis Ye, Chen & Bu. However , in the female, P. laosensis sp. n. can be distinguished by the posterior part of connexiva strongly convergent ( Figs. 5 , 15 ); by the smallest distance between connexiva at apex of segment VII approximately equal to thickness of a connexivum ( Fig. 15 ); In the male, further difference is found in the shape of the paramere, with a narrow, short basal part and elongate, slender distal falciform part, pre-apical part with cluster of rather long brownish hairs, and apex acuminate ( Figs. 27, 28 ).

Description of apterous female ( Figs. 2 , 5 ). Color: ground color reddish, head bright reddish, labrum brownish, with buccula orange, rostrum yellowish with black apex; antennae shining black except basal part of antennal segment I yellowish ( Fig. 2 ); pronotum reddish ( Fig. 5 ), posterior part of pronotum with scattered slightly dark punctures; legs mainly yellowish brown, apical part of femora brownish, tibiae weakly infuscated, tarsi blackish brown ( Fig. 2 ); abdominal dorsum dull red ( Fig. 5 ), connexiva mainly dull reddish except internal parts of laterotergites bright yellowish; abdominal venter orange. Structural characteristics: body length 2.98–3.01 (holotype: 3.00), medium-sized, rather stout, diamond shape in dorsal view, bearing short, blackish, appressed pubescence and dorsum anteriorly and laterally covered by suberect and thick hairs; head deflected, head length: 0.37–0.38, head width: 0.80–0.81, about 2.10 times head length, hind margin of head laterally and ventrally with some black peglike spiculae; antennae relatively short and stout, about 0.56 times as long as body, lengths of antennal segments I–IV: 0.48, 0.35, 0.38, 0.48; pronotum length: 0.91–0.93, pronotum width: 1.09–1.10, hind margin of pronotum broadly rounded, medially reaching hind margin of mediotergite I, lateral part of pronotum medially without a distinct constriction ( Fig. 5 ), posterior part slightly wider than anterior part, mesonotum and metanotum completely hidden beneath pronotal lobe except laterally, prosternum anteromedially with one row of black peg-like spiculae; legs mainly with decumbent, suberect and blackish hairs, tarsi of fore leg short and incrassate, tarsi of middle and hind legs long and slender, lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.81, 0.70, and 0.38 (0.07 + 0.31), middle leg: 1.00, 1.10, and 0.95 (0.30 + 0.30 + 0.35), hind leg: 1.00, 1.42, and 0.62 (0.11 + 0.19 + 0.32); mediotergites not flat, areas after mediotergite IV strongly depressed, connexiva stout and raised, posterior part strongly convergent ( Fig. 15 ), the smallest distance between connexiva at apex of segment VII approximately equal to thickness of a connexivum ( Fig. 15 ), mediotergites I–III with short, sparse hairs, mediotergites IV–V bare, hind margin of mediotergite VII with cluster of relatively long, blackish, posterodorsad-directed hairs, posterior part of connexiva VII with dense, posterodorsad-directed and blackish hairs, connexiva VIII with dense, blackish hairs in caudal aspect ( Figs. 15, 18 ). Genital segments: gonocoxa I simple, platelike, exposed; proctiger small, directed posteriorly, with dense, short hairs.

Description of apterous male ( Fig. 10 ). Similar to apterous female in general structure and coloration with following exceptions: body slightly slender, body length 2.80–2.82; head length: 0.38–0.39, head width: 0.73–0.75, about 1.92 times head length, antennae about 0.59 times as long as body, lengths of antennal segments I–IV: 0.45, 0.35, 0.40, 0.46; pronotum length: 0.82–0.83, pronotum width: 1.11–1.12; lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.75, 0.70, and 0.37 (0.06 + 0.31), middle leg: 0.95, 1.10, and 0.94 (0.28 + 0.31 + 0.35), hind leg: 1.00, 1.42, and 0.67 (0.12 + 0.20 + 0.35), grasping comb relatively long, about 0.23 times fore tibiae length; mediotergites almost flat, connexiva narrow, slightly raised, weakly convergent ( Fig. 10 ), all mediotergites and laterotergites with sparse and long blackish hairs, connexiva VII without cluster of dense hairs ( Fig. 10 ); abdominal segment VIII ( Fig. 21 ) about 1.29 times as long as wide, with dorsal hind margin concave, pygophore and proctiger simple, proctiger about 2.05 times as long as wide ( Fig. 24 ), paramere with a narrow, short basal part and elongate, slender distal falciform part, pre-apical part with cluster of rather long brownish hairs, apex acuminate ( Figs. 27, 28 ).

Description of macropterous female ( Fig. 7 ). Similar to apterous female in general structure and coloration with following exceptions: body relatively large, body length 3.22–3.23 (including fore wing); head length: 0.30– 0.31, head width: 0.71–0.72, about 2.4 times head length, antennae about 0.41 times as long as body, lengths of antennal segments I–IV: 0.35, 0.28, 0.30, 0.40; pronotum length: 1.41–1.43, pronotum width: 1.51–1.53, pronotum with a constriction in front of humeral corners, medial part without blackish mark, humeral corners prominent ( Fig. 7 ), entire surface with numerous scattered punctures; lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.65, 0.65, and 0.34 (0.05 + 0.29), middle leg: 0.90, 1.00, and 0.82 (0.25 + 0.28 + 0.29), hind leg: 1.00, 1.35, and 0.60 (0.10 + 0.25 + 0.25); forewings mainly blackish brown, slightly surpassing tip of abdomen, laterally adjacent to medial edge of raised connexiva, hemelytron with thick corium with two closed cells, veins adjacent to raised connexiva reddish with short, suberect and black hairs ( Fig. 7 ).

Description of macropterous male ( Fig. 12 ). Ground color as in macropterous female; body length 3.30–3.32 (including fore wing); structure of head including antennae as in female, head length: 0.31–0.32, head width: 0.70– 0.71, about 2.21 times head length, antennae about 0.43 times as long as body, lengths of antennal segments I–IV: 0.40, 0.30, 0.30, 0.41; pronotum length: 1.42–1.43, pronotum width: 1.45–1.46; lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.75, 0.65, and 0.34 (0.05 + 0.29), middle leg: 0.90, 1.06, and 0.93 (0.30 + 0.33 + 0.30), hind leg: 1.10, 1.41, and 0.57 (0.07 + 0.25 + 0.25); grasping comb relatively long, about 0.38 times fore tibiae length; other characters as in macropterous female.

Etymology. This new species is endemic to Laos and the specific name is derived from the name of type locality.

Habitats: Specimens of P. laosensis sp. n. have been observed and collected in the shaded water surface covered by boulders near the waterfall ( Fig. 30 ).

Distribution. Laos (Muang Xai) ( Fig. 32 ).

Figures

FIGURE 32. Distribution records of species of Perittopus in Indochina.

FIGURES 1–3. Habitus of Perittopus spp. (females). (1) P. anthracinus sp. n. (holotype); (2) P. laosensis sp. n. (holotype); (3) P. trizonus sp. n. (holotype). Scale = 1.0 mm.

FIGURES 4–13. Bodies of females (4–8) and males (9–13) of Perittopus spp. in dorsal view. (4, 9) P. anthracinus sp. n. (apterous); (5, 10) P. laosensis sp. n. (apterous); (6, 11) P. trizonus sp. n. (apterous); (7, 12) P. laosensis sp. n. (macropterous); (8, 13) P. trizonus sp. n. (macropterous). Scale = 1.0 mm.

FIGURES 14–19. Abdomen of Perittopus spp. in dorsal and lateral view (female). (14, 17) P. anthracinus sp. n.; (15, 18) P. laosensis sp. n.; (16, 19) P. trizonus sp. n.. Scale = 1.0 mm.

FIGURES 20–29. Male genitalic structures of Perittopus spp.. Abdominal segment VIII in ventral views (20–22). (20) P. anthracinus sp. n.; (21) P. laosensis sp. n.; (22) P. trizonus sp. n.. Scale = 0.1 mm. Proctigers in dorsal views (23–25). (23) P. anthracinus sp. n.; (24) P. laosensis sp. n.; (25) P. trizonus sp. n.. Scale = 0.1 mm. Right parameres (26, 27, 29. in lateral views; 28. in perpendicular view). (26) P. anthracinus sp. n.; (27, 28) P. laosensis sp. n.; (29) P. trizonus sp. n.. Scale = 0.1 mm.

FIGURES 30–31. Type localities of Perittopus spp.. (30) P. laosensis sp. n.; (31) P. trizonus sp. n..