Lasioglossum (Dialictus) atroglaucum
Creators: name: Murao, Ryuki
name: Tadauchi, Osamu
name: Lee, Heung-Sik
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Halictidae
Lasioglossum
Lasioglossum atroglaucum

description: Lasioglossum (Dialictus) atroglaucum (Strand, 1913)
Figs 4A, 5 A–C, 6, 7, 12A
Halictus atroglaucus Strand, 1913: 170 (holotype: SDEI, ♂; type locality: Suisharyo, Formosa).
Halictus atroglaucus – Hirashima 1957: 5.
Lasioglossum (Evylaeus) atroglaucum – Ebmer 2002: 860–861.
Diagnosis
This species is easily separated from other members of the atroglaucum subgroup by the male S4 having dense and curly plumose hairs (Fig. 4A) and by the shape of the gonostylus (Fig. 7C).
Material examined
Holotype
TAIWAN: ♂ (Code No. DEIGISHym10517), Suisharyo, 11 Oct. (Sauter leg., SDEI).
Additional material
TAIWAN: 1 ♂, Ya Kou, alt. 2800 m, Kao Hsiung Hsien, S-Taiwan, 1 Aug. 1986 (K. Baba, ELKU); 3 ♂♂, Yu Shih, (alt. 1900 m), Nao Tow Hsien, M-Taiwan, 4 Jul. 1986 (K. Baba, ELKU); 1 ♂, Hehuanxi, 23 Jun. 1976 (H. Makihara, ELKU).
Measurements (n= 5, unit mm)
BL = 5.57–7.29 (6.17 ±0.66), WL = 4.86–5.29 (5.06 ±0.22), HL = 1.29–1.42 (1.37 ±0.05), HW = 1.35– 1.39 (1.38 ±0.01), IOD = 0.24–0.29 (0.26 ±0.02), OOD = 0.23–0.26 (0.24 ±0.01), OCD = 0.16–0.19 (0.18 ±0.01, n= 4), UOD = 0.84–0.87 (0.85 ±0.02), MOD = 0.97–1.00 (0.99 ±0.02), LOD = 0.50–0.58 (0.55 ±0.03), IAD = 0.19–0.23 (0.21 ±0.01), AOD = 0.16–0.18 (0.16 ±0.01), CAL = 0.23–0.27 (0.25 ±0.02), CPL = 0.34–0.37 (0.35 ±0.01), EL = 1.00–1.10 (1.06 ±0.04), EW = 0.45–0.50 (0.49 ±0.02), GW = 0.25–0.35 (0.30 ±0.04), SPL = 0.31–0.34 (0.32 ±0.01), F1L = 0.13–0.16 (0.14 ±0.01), F2L = 0.27– 0.29 (0.28 ±0.01), F3L = 0.27–0.32 (0.31 ±0.02), F2W = 0.13–0.16 (0.15 ±0.01), MsW = 1.50–1.60 (1.55 ±0.06, n= 4), SCL = 0.34–0.38 (0.36 ±0.02), MNL = 0.18–0.23 (0.20 ±0.02), MPL = 0.30–0.34 (0.33 ±0.02), MtW = 1.00–1.15 (1.07 ±0.07).
Redescription
Male
COLORATION. Body black except for the following parts: head dark green and mesosoma metallic green; clypeus yellow on lower half; mandible reddish brown apically; flagellum blackish brown ventrally; tegula blackish brown translucent; tibial spur yellow; metasomal terga narrowly brown translucent apically. Wings transparent, veins and stigma brown.
PUBESCENCE. Body hairs whitish, and covered with erect and sparse fine, branched hairs except for the following parts: lower paraocular area with sparse tomentose; lower clypeus with sparse simple hairs; tibial and tarsal hairs nearly simple; disc of metasomal terga with sparse and simple short hairs; disc of S2–S3 apically with moderately dense fine, branched hairs; disc of S4 apically with dense and curly plumose hairs (Fig. 4A); disc of S5 with sparse short and simple hairs, mixed with sparse fine, branched hairs laterally; disc of S6 with sparse short and simple hairs.
HEAD. As long as wide; HW:HL = 1:0.99. Vertex rounded in frontal view. MOD:UOD:LOD = 1:0.86:0.56. IOD:OOD:OCD = 1:0.90:0.67. IAD:AOD = 1:0.76. Ocellocular and paraocular areas and frons dull,
with reticulate PP. Supraclypeal area weakly convex, dull, with sparse PP, IS distinctly tessellate (IS = 1–4). CPL:CAL = 1:0.72. Clypeus nearly flat, with sparse PP, IS weakly tessellate (IS = 1–4.5). EW:GW = 1:0.61. Genal area with straight ridges and distinct tessellation. Malar space linear. Occiput not carinate. Postgena weakly tessellate. Mandible edentate. Labrum (Fig. 6C) without basal elevation and distal process. Antenna long, reaching metasoma. F2L:F2W = 1:0.54; flagellum nearly flattened ventrally.
THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 6D) with moderately dense PP on marginal area,
gradually sparse toward anterior to medial areas; IS weakly tessellate anteriorly, but nearly smooth medially and posteriorly (IS = 0.5–2 in marginal area, 1.5–4.5 in anterior to medial areas); parapsidal line a narrow groove. Mesoscutellum with dense PP over entire surface, IS smooth (IS = 1–2). Metanotum weakly rugulose. Mesepisternum (Fig. 6E) shiny, with sparse PP over entire surface, IS smooth (IS = 1.5–6). SCL:MNL:MPL = 1:0.55:0.91. Propodeum: metapostnotum (Fig. 6F) gently inclined, with longitudinal ridges not reaching posterior margin; junction between metapostnotum and posterior surface smooth, not carinate; lateral surface weakly rugulose; posterior surface with lateral carina on lower half, without oblique carina. Fore trochanter narrow, longer than wide. Hind tibia without basitibial plate. Hind basitarsus slender, approximately 4.6 × as long as wide. Inner hind tibial spur finely serrate. Fore wing with three submarginal cells.
ABDOMEN. Discs of T1–T3 with sparse fine PP. T1 without lineolation. Lineolation on T2 basally, on T3–T5 over entire surface. Apical margin of S4–S6 nearly straight (Fig. 5 A–C). S5 with shallow apical depression (Fig. 5B). S7–S8 (Fig. 7E): median process of S7 triangular, apex not exceeding S8; S8 without median process.
GENITALIA (Fig. 7 A–D). Gonobase flat at bottom, ventral arms not connected with each other at upper ends; gonocoxite smooth, gently sloped in lateral view, inner dorsal margin angulate at the approximately basal half; gonostylus small and thin, bud-like in lateral view, located on top of gonocoxite, and with
sparse short and a few relatively long hairs; ventral retrorse lobe tongue-like, moderately long but not reaching gonobase, with dense short setae; penis valve higher than gonocoxite, with low cleft on top.
Female
Unknown.
Distribution
Taiwan.
Flight period
Male: late June to early August.
Flower records
Not recorded.
description: Published as part of Murao, Ryuki, Tadauchi, Osamu & Lee, Heung-Sik, 2015, Synopsis of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera, Apoidea, Halictidae) in Japan, the Korean Peninsula and Taiwan, pp. 1-50 in European Journal of Taxonomy 137 on pages 13-18, DOI: 10.5852/ejt.2015.137, http://zenodo.org/record/3785420