Micronecta (Micronecta) lumutensis Chen, Nieser & Lansbury, 2008

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 : 38

Taxon classification Animalia Hemiptera Micronectidae

Micronecta (Micronecta) lumutensis Chen, Nieser & Lansbury, 2008 Figs 16, 34, 45, 60, 68, 78, 79, 92

Micronecta lumutensis Chen, Nieser & Lansbury, 2008: 270-272 (original description).

Type material examined.

INDONESIA: Kalimantan Timur: Pasir, Gunung Lumut, 2 km E of Rantaulayong, 01°36.36'S, 115°58.38'E, 24.XI.2005, E. Gassó Miracle, EGM25, evergreen rainforest along river, at light, ML 19/21 hrs., 1 male holotype, 1 male and 2 female paratypes, all macropterous (RMNH).

Redescription.

Macropterous form. Generally a small (body length 1.5 mm) grayish Micronecta , with poorly contrasting markings.

Dimensions. Body length: male 1.48-1.52, female 1.45-1.50; width: male 0.69-0.72, female 0.52-0.54; diatone: male 0.49-0.51, female 0.52-0.54; width of pronotum: male 0.54-0.57, female 0.56-0.58; ocular index: male 1.77-1.78, female 1.59-1.60. Body length 2.1-2.5 times the maximal width. Pronotum slightly wider than head, synthlipsis wider than the posterior width of an eye (S/E 0.24/0.16).

Colour. Vertex sordid yellow, the frons yellowish with a brown spot, eyes grey, rostrum yellowish with dark brown transverse grooves. Pronotum yellowish brown, disk unmarked, posterior and lateral margins with a yellowish stripe. Hemelytra yellowish brown, apex of clavus darker brown, corium with three interrupted longitudinal brown stripes (Fig. 16), right membrane poorly delimited from the corium, with the same colour and texture as corium but without darker stripes, left membrane more distinctly separated from its corium, hyaline, and more membranous than the corium. Venter of abdomen and thorax grayish, legs yellowish.

Pronotum (Fig. 16) convex dorsally, about two and half times as wide as long (W/L male 0.56/2.1, female 0.57/0.23). Hemelytra smooth, beset with small spinules, notably on corium, arranged in longitudinal rows, and along the membranal suture. Spines laterally on abdominal segments: V with two short and one longer stout spines; VI with two or three short and one intermediate spine; VII with three or four short, one intermediate, and one or two long, stout spines; VIII with five short spines and two long hair-like bristles.

Legs. Length of leg segments: fore leg: male: femur 0.19, tibia 0.07, pala 0.11; female: femur 0.20, tibiotarsus 0.20; middle leg: male and female: femur 0.49, tibia 0.17, tarsus 0.24, claw 0.17; hind leg: male and female: femur 0.31, tibia 0.25, tarsus I 0.26, tarsus II 0.12, claw 0.07. Palmar bristles: about 15 in upper row, about 16 in lower row.

Male. Fore femur (Fig. 34) with a pair of pegs on proximal third, a subdistal peg dorsally, and one or two small pegs distally; pala with three long, dorsal hairs. Claw slender, clavate. Dorsum of abdomen: prestrigilar flap (Fig. 45) with a short, acute apex; strigil small, suboval, at a magnification of 400 ×, no separate teeth observable; free lobe of left part of tergite VIII (Fig. 68) more or less parallel-sided, softly curved, with a rounded apex and 9-10 apical bristles. Mediocaudal lobe of sternite VII (Fig. 60) short, acute, with three or four larger bristles. Left paramere (Fig. 79) apically slightly dilated, with an apical impression; right paramere in lateral view (Fig. 78) gradually widened toward apex, basal lobe with about eight stridulatory ridges.

Female. Fore femur with the same general arrangement of pegs and setae as in male. Seminal capsule of spermatheca mushroom-shaped (Fig. 92).

Comparative notes.

The small size, with a body length of about 1.5 mm, separates this species from other Bornean species except Micronecta skutalis . Males of Micronecta lumutensis and Micronecta skutalis can be separated by the characters of parameres as given in the key (Figs 78-79, 84-85). In addition, the seminal capsule of Micronecta lumutensis is mushroom-shaped (Fig. 92), whereas that of Micronecta skutalis is egg- or urn-shaped (Fig. 95). Females can be indentified only by their association with males.

Habitat.

The type specimens were collected at light in a mountainous area.

Distribution.

Indonesia: Kalimantan Timur ( Chen et al. 2008).