Micronecta (Micronecta) erythra, Nieser & Chen & Yang, 2005

Nieser, Nico, Chen, Ping-ping & Yang, Chang Man, 2005, A New Subgenus And Six New Species Of Nepomorpha (Insecta: Heteroptera) From Yunnan, China, Raffles Bulletin of Zoology 53 (2), pp. 189-209 : 191-194

Micronecta (Micronecta) erythra , new species

( Figs. 1-11 )

Material examined. – Holotype ( CAS) - brachypterous male, CHINA: Yunnan, Xishuangbanna, 119 km from Jinghong to Mengla , rocky stream, 1 Jun.2002, coll. C. M. Yang & P. Chew, YCM310.

Paratypes: same data as holotype 1 female ( ZRC); Yunnan, Xishuangbanna, Mengla , 55th stream, 30 May.2002, coll. C. M. Yang & P. Chew, YCM303, 1 male ( NCTN); Yunnan, Xishuangbanna, Mengla, mountain stream by waterfall, 18 May.2000, coll. L. Cheng, LC001, 1 male ( ZRC); km 10 Menglun to Mengyang, 21 May.2000, coll. L. Cheng, LC014, 1 male ( ZRC); Yunnan, pool at waterfall 65 power station, 21 May.2000, coll. L. Cheng, LC016, 1 male, 4 females ( CAS, ZRC), 1 male, 1 female ( NCTN). All brachypterous .

Description. - Based on brachypterous specimens in alcohol. In dorsal view a light reddish brown, shiny, rather small ovate species with its greatest width at the caudal apex of claval commissure ( Fig. 1 ).

Dimensions. Length, male <x> 1.62, s 0.051 {1.58}, female <x> 1.54, s 0.038; width, male <x> 0.88, s 0.040 {0.86}, female <x> 0.83, 0.014; width of head, male <x> 0.64, s 0.022 {0.62}, female <x> 0.62, s 0.013; synthlipsis, male <x> 0.31, female <x> 0.30; posterior width of an eye, male <x> 0.17, female <x> 0.18; width of pronotum, male <x> 0.63 s 0.021 {0.65}, female <x> 0.62 s 0.017; ocular index, male <x> 1.88 s 0.109 {2.00}, female <x> 1.89 s 0.080.

Micronecta guttatostriata Lundblad, 1933a: 101-102 .

Micronecta (Lundbladella) guttatostriata - Wróblewski 1967: 240- 243.

Material examined. – CHINA: Yunnan, Xishuangbanna, km 10 Menglun to Mengyang , 21 May.2000, coll. L. Cheng, 1 male, 1 female ( ZRC) ; Yunnan, Morhan, stream near grazing field, 3 km from Laotian border, 23 May.2000, coll. L. Cheng, 1 male ( ZRC). All brachypterous. First record for China .

Distribution. – Indonesia (Java), Malay Peninsula, Thailand, Vietnam ( Nieser, 2002b) and SW China.

Micronecta (Micronecta) drepani Nieser , new record

Micronecta drepani Nieser, 2000: 278-281 .

Material examined. – CHINA: Yunnan, Menglun , pool at waterfall 65 power station, 21 May.2000, coll. L. Cheng, 2 males macropterous, 4 larvae ( ZRC). First record for China .

Distribution. – Thailand, SW China.

Colour. Dorsally reddish to light brown; head sordid yellow, eyes greyish brown. Pronotum unicolorous medium brown except for caudolateral angles and posterior margin yellow; scutellum sordid yellow. Hemielytra light brown with a reddish hue due to small red dots which are especially dense proximally on clavus, covering the hyaline mark and along costal margin; distal margin of right membrane grey, continuing in a grey stripe along posterior margin to apex of clavus; left membrane entirely grey; embolium yellowish with an ill-defined darker stripe near inner margin; no brown patches at costal margins. Venter and legs yellowish. The holotype has a pair of large blackish marks on corium just distally of the apex of clavus, one at costal margin and one at the opposite margin. In the paratypes these marks are smaller and less distinct.

Structural characteristics. Length 1.9 times width. Width of head and pronotum subequal, synthlipsis twice (1.7-2.1) the posterior margin of an eye. Pronotum poorly developed, about four (3.8-4.3) times as wide as long, lateral margins short. Hemielytra densely but shallowly pitted on clavus and corium, with small pale spinules in most of the pits of corium. Spines laterally on abdominal segments: VI two short, one or two long ( Fig. 4 ); VII three short, one long or two short two long; VIII five short two very long hair-like and one or two long bristles. Pala ( Fig. 9 ) with three dorsal bristles; upper row of palm with about 13 bristles the distal one larger; ventral row with about 18 bristles which are becoming thicker distally. Leg measurements as in table 1.

Male. Fore leg ( Fig. 9 ), femur with two dorsoapical spines, one dorsally in apical third and two in basal half. Tibia with one spine in apical third. Palar claw clavate to urn-shaped ( Fig. 10 ). Prestrigilar lobe ( Fig. 6 ) well differentiated, apically acutely pointed. Strigil small ( Fig. 5 ) subrectangular, with one comb bearing about 35 densely packed teeth; next to it there is a dark patch so that the strigil appears larger at first sight ( Fig. 4 ). Mediocaudal lobe of seventh abdominal sternite ( Fig. 8 ) well developed, with a blunt apex and four well defined bristles on its surface. Free lobe of left part of segment eight ( Fig. 7 ) elongate, apical margin evenly rounded; with 17 bristles in lateroapical part which is slightly not produced. Right paramere ( Fig. 2 ) with its shaft evenly curved, tapering in basal half, parallel-sided in apical half, apex rounded, basal process with about 30 stridulatory ridges. Left paramere ( Fig. 3 ) with a broad shaft with a small projection halfway on the side, opposite to the basal lobe.

Female. Receptaculum seminis urn-shaped ( Fig. 11 ).

Macropterous form unknown.

Etymology. – Erythros (Greek adjective meaning reddish or red) referring to the reddish hue on the hemielytra.

Comparative notes. – This new species is structurally similar to M. hummeli Lundblad (1934) from northeast Sichuan, which has a virtually identical male fore leg, a similar free lobe of left part of segment eight, and is of the same size. However, the right paramere of M. hummeli is apically hooked and not evenly curved, and the left paramere is of the same general shape but has a distinct wide incision below the small projection on the shaft, more or less as in M. ornitheia new species ( Fig. 33 ), see also under that species. The right paramere of M. erythra has a somewhat similar shape as in M. drepani Nieser, 2000 from Thailand, which has a left paramere of the same type but without the small projection halfway the shaft. Moreover, M. drepani has a large trowelshaped palar claw, and is somewhat larger (male length 1.9- 2.1).

Figures

Fig. 1. Micronecta erythra, holotype, brachypterous male, dorsal view, body length 1.65 mm. Scale: 0.1 mm.

Figs. 2-8. Micronecta erythra, new species, paratype, male; 2) right paramere; 3) left paramere; 4) right part of tergite VI; 5) strigil, scale 0.05 mm; 6) prestrigilar lobe; 7) free lobe of left part of tergite VIII; 8) mediocaudal lobe of sternite VII. Scale: 0.1 mm.

Figs. 9-11. Micronecta erythra, new species, paratypes; 9) male, foreleg; 10) apex of male pala; 11) female, receptaculum seminis.

Figs. 32-38. Micronecta ornitheia, new species, paratypes; 32-36 male; 32) right paramere; 33) left paramere; 34) right part of tergite VI; 35) strigil, scale: 0.05mm; 36) prestrigilar lobe; 37) female, receptaculum seminis; 38) male, free lobe of left part of tergite VIII. Figs. 32- 34, 36-38. scale: 0.1 mm.