Micronecta (Sigmonecta) kymatista Nieser & Chen, 1999

Chen, Ping-ping, Nieser, Nico & Lapidin, Johnny, 2015, A review of Bornean Micronectidae (Hemiptera, Heteroptera, Nepomorpha) with descriptions of two new species from Sabah, Malaysia 1, ZooKeys 501, pp. 27-62 : 45

Taxon classification Animalia Hemiptera Micronectidae

Micronecta (Sigmonecta) kymatista Nieser & Chen, 1999 Figs 8, 20, 41, 49, 56, 64, 72, 86, 87, 96

Micronecta kymatista Nieser & Chen, 1999: 82-83 (original description).

Type material examined.

Holotype macropterous male (RMNH), INDONESIA: Sulawesi Utara, Dumoga Bone N.P. Malibagu Road 10 km H, ca. 250m a.s.l., 2 sept.1985, secondary growth, at light, leg. J. Huijbregts, HH437. Paratypes, same data as holotype, 14 males, 16 females (RMNH).

Additional Material examined.

INDONESIA: Sulawesi Utara: Dumoga Bone N.P., Malibagu Road, 10 km N, ca. 250 m a.s.l., 2.ix.1985, second growth, at light, leg. J. Huijbregts, 1 female. Sulawesi Tenggara: Wawonggole, Sungai Anggoro, 20.ii.1989, sluggish stream in open woodland, leg. N. Nieser, N8801, 1 female; Sulawesi Tenggara: Desa Kagunyala, pond overgrown by Azolla and Lemna , 21.ii.1989, leg. N. Nieser, N8906, 1 male; Sulawesi Tenggara: Pulau Buton, mangrove swamp along road Bau-bau to Lawele, 9.iii.1989, leg. N. Nieser, 2 males (all macropterous paratypes, in NCTN).

Redescription.

Macropterous form. Generally a quite large (body length 2.8-3.1), light to medium-brown species; corium with four longitudinal, brownish stripes, very often interrupted.

Dimensions. Length: male 2.8-2.9, female 2.9-3.1; width: male 1.25-1.32, female 1.28-1.39; diatone: male 1.01-1.03, female 1.04-1.11; width of pronotum: male 0.98-1.01, female 1.02-1.08; ocular index: male 1.25-1.32, female 1.17-1.30. Body length 2.15 times maximal width (male 2.46/1.10, female 2.79/1.22). Head slightly wider than pronotum (male 1.02/1.00, female 1.08/1.05), synthlipsis 1.2 times as wide as the posterior margin of an eye.

Colour. Frons and vertex sordid yellow, eyes grayish. Pronotum light to medium brown, disk unmarked, posterior margin with a distinct yellowish stripe. Hemelytra sordid yellow to light brown, clavus with a darker medium-brown stripe along the suture between clavus and corium suture, corium typically with four fragmented longitudinal medium-brown stripes (Fig. 20), embolium yellowish with three or four indistinct brownish spots; right membrane poorly delimited from the corium, with the same colour and texture but without darker stripes; left membrane more distinctly separated from corium, hyaline to somewhat smoky and more membranous than the corium. Venter, abdomen, thorax, and legs pale yellow.

Pronotum well developed, dorsally convex with lateral margins straight or more or less truncate (Fig. 20), about three times as wide as long (W/L male 1.00/0.34, female 1.05/0.36). Hemelytra smooth, beset with numerous small but distinct spinules. Spines laterally on abdominal segments: V with two short and one longer stout spine; VI with two or three short and one long spine; VII with two or three short and one long stout spine; VIII with five or six short and one longer, stout spine and two long hair-like bristles.

Legs. Length of leg segments: fore leg: male: femur 0.26, tibia 0.14, pala 0.14; female: femur 0.26, tibiotarsus 0.26; middle leg: male: femur 0.70, tibia 0.23, tarsus 0.30, claw 0.25; female: femur 0.76, tibia 0.23, tarsus 0.33, claw 0.26; hind leg: male: femur 0.46, tibia 0.36, tarsus I 0.40, tarsus II 0.13, claw 0.08; female: femur 0.48, tibia 0.37, tarsus I 0.44, tarsus II 0.16, claw 0.08. Palmar bristles: 15 in upper and lower row.

Male. Fore femur with a pair of pegs on proximal third, and a pair of small pegs distally; tibia with a dorsoapical peg. Pala (Fig. 41) with three long dorsal hairs, the apical bristles in lower row distinctly thicker than the bristles of lower row. Claw broadly clavate, gradually dilated from base to apex, without ventral notch. Dorsum of abdomen: prestrigilar lobe (Fig. 49) difficult to observe, strigil (Fig. 56) with one, relatively broad comb with about 50 elongate teeth. Median lobe of sternite VII (Fig. 64) apically narrow with a rounded apex, without obvious longer bristles. Free lobe of left part of tergite VIII (Fig. 72) sigmoid with about 12 apical bristles. Medial margin of right lobe of tergite VIII with 28-35 bristles caudally, placed in a double to triple row on caudal half (Fig. 8). Left paramere (Fig. 87) with a comparatively narrow shaft and a sickle-shaped apex; right paramere, in lateral view (Fig. 86), with an evenly curved, more or less parallel-sided, apically tapering shaft, basal lobe with about 40 stridulatory ridges on the pars stridens.

Female. Fore leg with the same general arrangement of pegs and setae as in male. Seminal capsule of spermatheca elongate-clavate (Fig. 96).

Comparative notes.

This species is similar to Micronecta quadristrigata , which is smaller on average and has fewer bristles on the caudal half of inner margin of right part of tergite VIII in males (see key and Figs 8-9).

Habitat.

This species has been found in ponds and sluggish streams mostly in less disturbed areas.

Distribution.

Indonesia: Sulawesi and Borneo (Kalimantan Timur) ( Nieser and Chen 1999).