Micronecta halei Chen, 1965

Tinerella, Paul P., 2013, <strong> Taxonomic revision and systematics of continental Australian pygmy water boatmen (Hemiptera: Heteroptera: Corixoidea: Micronectidae) </ strong>, Zootaxa 3623 (1), pp. 1-121 : 97-101

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https://doi.org/ 10.11646/zootaxa.3623.1.1

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Micronecta halei Chen, 1965


Micronecta halei Chen, 1965 View in CoL

( Figs. 53–56 View FIGURE 53 View FIGURE 54 View FIGURE 55 View FIGURE 56 )

Micronecta halei Chen, 1965: 157 View in CoL .

Micronecta windi Chen, 1965: 161 View in CoL .

Micronecta halei: Wróblewski 1970: 695 View in CoL . (junior synonym, secondary junior homonym)

Micronecta halei: Wróblewski, 1972b: 518 View in CoL . [note]

Micronecta windi: Wróblewski, 1972b: 518 View in CoL . [suspected synonymy]

Micronecta halei: Cassis and Gross, 1995: 68 View in CoL . [catalogue]

Micronecta windi: Cassis and Gross, 1995: 70 View in CoL . [catalogue]

Micronecta halei?: Halse et al., 2000: 260 View in CoL . [list]

Micronecta halei: Andersen and Weir, 2004: 250 View in CoL , 334. [key; list]

Diagnosis: Recognized by combination of the following characters. Faintly developed hemelytral patterning ( Figs. 53b–d View FIGURE 53 ), metaxyphus ( Fig. 54b View FIGURE 54 ), distally expanded male palar claw ( Fig. 54d View FIGURE 54 ), sternal process of abdominal segment VII ( Fig. 54f View FIGURE 54 ), and the distinct male genitalia ( Figs. 55a–e View FIGURE 55 ). Similar in general habitus to Micronecta quadristrigata and M. queenslandica .

Size: ( Table 17). Macropterous form: 2.77–3.34 mm. Brachypterous form unknown.

Derivation of specific epithet: Chen (1965) named the species honoring Dr. H. M. Hale.

Notes on type material: Holotype, allotype, and 11 paratypes are deposited in SAMA. In addition, two males and eight females paratypes are deposited in SEMC. I have examined the holotype ( Figs. 53a–b View FIGURE 53 ), allotype, and nine paratypes from SAMA, and five paratypes from SEMC.

Description: Based on macropterous form. Measurements. Length: male 2.77–3.11; female 3.18–3.34; Width: male 1.36–1.46; female 1.42–1.51; Width of head: male 1.02–1.23; female 1.15–1.23; Synthlipsis: male 0.43–0.50; female 0.33–0.53; Width of eye: male 0.31–0.42; female 0.33–0.43; Width of pronotum: male 1.01–1.19; female 1.13–1.19; Length of pronotum: male 0.33–0.52; female 0.48–0.59.

Color: Ground color dark brown ( Figs. 53b–d View FIGURE 53 ). Head dark brown, eyes silvery-brown. Vertex infuscated, frons, clypeus, and genae unicolorous dark brown with darker areas throughout. Labium black. Antennae pale brown. Pronotum dark brown, unicolorous, with expanded pale apical band spanning width. Scutellum dark brown, pruinose medio-apically. Clavi each with basal broad, pale diagonal area well-developed, medial and apical portions same ground color as rest of hemelytra. Lateral margins of clavi outlined with narrow, pale line. Corium dark brown, lateral margins with lighter areas. Hemelytral patterning not well-developed, at most, a faint linear pattern discernible in medial portion of corium. Prenodal embolar area long and narrow, infuscated medially, postnodal embolar area well-developed, short and broad. Left membrane of both sexes subhyaline. Venter of both sexes light brown. Natatorial setae of metatarsus not especially darkened.

Structural characteristics: Ratio of body length/width: males 2.12; females 2.22. Width of head generally greater than pronotal width, synthlipsis 1.2 times as wide as posterior width of eye. Ocular index: males 1.46; females 1.18. General facies of head (vertex, frons, and labium) proportionate. Third antennal segment densely pilose, ovate, apex narrowly rounded, segments one and two very short. Pronotum robust, convex, widest at middle with lateral margins tapered and truncate, about 2.5 times as wide as long (W/L: males 1.11/0.43; females 1.17/ 0.52). Prothoracic lobe short, relatively narrow with anterior and lower margins squared, posterior margin rounded ( Fig. 54a View FIGURE 54 ). Hemelytral microsculpturing consisting of dense, transverse meshes distributed over entire surface. Short setae uniformly distributed over entire hemelytral surface, setae sparse in basal portion of clavus. Metathoracic wings well-developed, reaching nearly to apex of hemelytra. Lateral spines on abdominal segments IV–VIII: IV: one stout, short spine, two thin, long setae; V: two stout, short setae, one long, stout seta; VI: two stout, short setae, two long, stout setae; VII: one short, stout spine, one long, thin spine, two long, thin setae; VIII: eight stout, short spines, two long, thin setae. Metaxyphus of both sexes narrow, short and triangular, with apex rounded ( Fig. 54b View FIGURE 54 ).

L= length, LP= length of pronotum, W= body width, WH= width of head, S= synthlipsis, WE= width of an eye, WP= width of pronotum, L:W= ratio body length to width, S:E= ratio of synthlipsis to eye width, OcI= ocular index.

Male foreleg ( Fig. 54c View FIGURE 54 ): femur with two short, stout spines in basal third near ventral surface and two prominent setae near base. Tibia with one long, stout spine in medial portion. Pala with five setae dorsally; 13 setae in upper palar row and 15–16 setae in lower palar row, lower row setae more pronounced than those of dorsal row. Apex of pala with a shorter thickened seta. Palar claw ( Fig. 54d View FIGURE 54 ) tapered proximad and broad apically. Female foreleg with same general setal arrangement as male. Mesotarsal claws equaling about one-third the length of the mesotarsus.

Lateral lobes of abdominal tergum IV broad, asymmetric. Right lobe longer, truncate apically, with 13 long setae, left lobe rounded apically, with 15 long evenly spaced, apical setae. Prestrigilar flap of tergal segment V as in Figure 54e View FIGURE 54 . Strigil small, nearly circular in outline, with few combs. Median lobe of sternite VII ( Fig. 54f View FIGURE 54 ) very broad basally, with numerous scattered setae, apex constricted, short and acuminate. Free lobe of tergite VIII ( Fig. 54g View FIGURE 54 ) broad, nearly quadrate with outer angle rounded and long inner angle. Setae of varying lengths confined to inner angle and apex, numbering about 26. Pars stridens processus cleaner ridges of tergite VIII not examined. Male left paramere ( Figs. 55a–d View FIGURE 55 ) long, parallel-sided, apex tapering with semi-circular hook-like distal process, apical scales present along inner portion and within hooked area. Base broad, upper portion reaching about onethird the length of the shaft, lower portion of base longer and rounded ( Figs. 55a–c View FIGURE 55 ). Right paramere ( Figs. 55a, c–d View FIGURE 55 ) long and relatively broad, shaft curved with tip gradually tapering to a blunt point ( Fig. 55d View FIGURE 55 ). Base long and wide, quadrate in outline. Pars stridens processus consisting of about 34 plectral ribs spanning lower portion of paramere base ( Fig. 55e View FIGURE 55 ). Aedeagus broad, as in Figures 55a–d View FIGURE 55 .

Distribution and Habitat: ( Fig. 56 View FIGURE 56 ). AUSTRALIA: Queensland, South Australia, Western Australia. Previously unrecorded for South Australia. No collection method or habitat data accompany the examined specimens.

Discussion: As Chen (1965) stated, the general appearance of Micronecta halei lacks any diagnostic features. General habitus suggests M. quadristrigata or M. queenslandica , however, all specimens examined possessed the light pronotal spots seen in Figures 53b–d View FIGURE 53 , which are seemingly unique to the species. The expanded apex of the palar claw discussed by Chen (1965) is indeed as such, however, cannot be relied on solely to distinguish males. Male genitalia of M. halei are diagnostic, as seen from the broad base and angled apex of the left paramere ( Figs. 55a–d View FIGURE 55 ). The right paramere is similar in form to M. annae ( Figs. 55a, c–d View FIGURE 55 ).

The identity of M. windi Chen is presently unclear. Chen (1965: 161) noted the similarity of M. halei and M. windi with her discussion based on the general habitus and the sternal process of abdominal segment VII. She also cited differences seen in the male genitalia for separation of the two. Micronecta windi was described from two males from Kuranda, Queensland.

Wróblewski (1972b) stated the suspected synonymy of M. halei and M. windi based on his genitalic examination of additional male specimens of M. halei , but refrained from formal synonymy apparently because he had not seen Chen’s two male specimens. I was able to examine Chen’s paratype of M. windi at SEMC, but was unable to dissect the specimen for genitalic examination and therefore could not positively confirm the identity. In the course of this research, I have not examined any specimens identifiable as M. windi . Re-examination of the two male specimens of M. windi [SEMC], along with additional specimens of M. halei is needed to resolve this issue.

Specimens examined: AUSTRALIA: South Australia: Cannuwaukaminna Bore , 11 km SW Etadunna H. S. 29-VII-1984. Bore Drain. D. Lacis. (1♂). [ SAMA] ; Western Australia: Woodstock Station , WS 9. 21 37S; 119 01 24E. 24-IX-1988. UV Light. B. P. Hanich. (16♂, 26♀♀). [ WAMP] GoogleMaps .


South Australia Museum














Micronecta halei Chen, 1965

Tinerella, Paul P. 2013

Micronecta halei:

Andersen, N. M. & Weir, T. A. 2004: 250

Micronecta halei?:

Halse, S. A. & Shiel, R. J. & Storey, A. W. & Edward, D. H. D. & Lansbury, I. & Cale, D. J. & Harvey, M. S. 2000: 260

Micronecta halei:

Cassis, G. & Gross, G. F. 1995: 68

Micronecta windi:

Cassis, G. & Gross, G. F. 1995: 70

Micronecta halei: Wróblewski, 1972b: 518

Wroblewski, A. 1972: 518

Micronecta windi: Wróblewski, 1972b: 518

Wroblewski, A. 1972: 518

Micronecta halei: Wróblewski 1970: 695

Wroblewski, A. 1970: 695

Micronecta halei

Chen, L. C. 1965: 157

Micronecta windi

Chen, L. C. 1965: 161
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