Lasioglossum (Dialictus) taiwanense Murao, 2015

Murao, Ryuki, Tadauchi, Osamu & Lee, Heung-Sik, 2015, Synopsis of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera, Apoidea, Halictidae) in Japan, the Korean Peninsula and Taiwan, European Journal of Taxonomy 137, pp. 1-50 : 23-26

Lasioglossum (Dialictus) taiwanense Murao sp. nov.

urn:lsid:zoobank.org:act:C164E332-E591-4C50-A4BD-9E4C208276B8

Figs 4E , 5 M–O, 10, 11, 12A

Diagnosis

This species is separated from other members of the atroglaucum subgroup by a combination of the following characters: male head wider than long; disc of male S4 with sparse and short hairs ( Fig. 4E ); male S5 gently incurved apically ( Fig. 5N ); and the shape of gonostylus of male genitalia ( Fig. 11 C–D).

Etymology

The specific name is derived from the type country, Taiwan.

Material examined

Holotype

TAIWAN: ♂, Hehuanxi, Songguangang , Nantou Pref., 24 Jun. 1976 (H. Makihara, ELKU).

Paratypes

TAIWAN: 4 ♂♂, Meishan-Tinchi (alt. 800–2300 m), Kao Hsiung Hsien, S-Taiwan, 29 Jun. 1986 (K. Baba, ELKU); 2 ♂♂, Pi Lu Chih, alt. 2500 m, Nan Tow Hsien, M-Taiwan, 5 Aug. 1986 (K. Baba, ELKU); 1 ♂, Tung Chih, alt. 1600 m, near Liu Kui, S-Taiwan, 30 Sep. 1986 (K. Baba, ELKU); 8 ♂♂, Hehuanxi, Songguangang, Nantou Pref., 24 Jun. 1976 (H. Makihara, ELKU); 3 ♂♂, Hehuanxi, 23 Jun. 1976 (H. Makihara, ELKU); 2 ♂♂, Sung Kang, alt. 2000–2300 m, Nantou IIsien, 29 Jun. 1965 (S. Kimoto, ELKU).

Measurements (n = 10, unit mm)

BL = 5.29–6.00 (5.65 ±0.32), WL = 4.43–5.14 (4.91 ±0.25), HL = 1.26–1.40 (1.32 ±0.06), HW = 1.32–1.45 (1.37 ±0.05), IOD = 0.19–0.26 (0.24 ±0.02, n= 9), OOD = 0.24–0.28 (0.27 ±0.01), OCD = 0.16–0.19 (0.18 ±0.02, n= 7), UOD = 0.84–0.90 (0.87 ±0.03), MOD = 0.92–1.03 (0.97 ±0.04), LOD = 0.55–0.61 (0.59 ±0.02), IAD = 0.23–0.26 (0.24 ±0.01), AOD = 0.16–0.19 (0.17 ±0.01), CAL = 0.19– 0.28 (0.25 ±0.02), CPL = 0.31–0.35 (0.33 ±0.01), EL = 0.95–1.05 (1.00 ±0.04), EW = 0.45–0.50 (0.47 ±0.02), GW = 0.20–0.35 (0.28 ±0.04), SPL = 0.29–0.32 (0.31 ±0.01), F1L = 0.13–0.15 (0.14 ±0.01), F2L = 0.23–0.27 (0.24 ±0.01), F3L = 0.24–0.27 (0.26 ±0.01), F2W = 0.15–0.16 (0.15 ±0.01, n= 9), MsW = 1.30–1.50 (1.44 ±0.07), SCL = 0.30–0.35 (0.33 ±0.02), MNL = 0.15–0.20 (0.17 ±0.02), MPL = 0.28–0.33 (0.31 ±0.02), MtW = 1.00–1.18 (1.07 ±0.06).

Description

Male

COLORATION. Body black except for the following parts: head dark green and mesosoma metallic green; clypeus yellow on lower half or lower 1/3; mandible reddish brown apically; flagellum blackish brown or 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 clypeus with sparse simple hairs; tibial and tarsal hairs nearly simple; disc of metasomal terga with sparse and simple short hairs. Metasomal sterna with sparse and short hairs, without special hair tufts.

HEAD. Wider than long; HW:HL = 1:0.96. Vertex rounded in frontal view. MOD:UOD:LOD = 1:0.90:0.61. IOD:OOD:OCD = 1:1.11:0.76. IAD:AOD = 1:0.71. Ocellocular areas, paraocular areas and frons dull, with reticulate PP. Supraclypeal area weakly convex, dull, with moderately dense PP,

IS distinctly tessellate (IS = 0.5–2). CPL:CAL = 1:0.77. Clypeus nearly flat, its sculptures similar to supraclypeal area, IS = 1–3.5. EW:GW = 1:0.59. Genal area with straight ridges and distinct tessellation. Malar space linear. Occiput not carinate. Postgena weakly tessellate. Mandible edentate. Labrum ( Fig. 10C ) without basal elevation and distal process. Antenna long, reaching metasoma. F2L:F2W = 1:0.63; flagellum nearly flattened on lower side.

THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Mesoscutum ( Fig. 10D ) with dense PP on marginal area, gradually sparse anterior to medial areas; IS weakly tessellate (IS = 0.5–1.5 on marginal area, IS= 0.5–3.7 on anterior to medial areas); parapsidal line a narrow groove. Mesoscutellum with dense PP (IS = 0.5–1.5) over entire surface, IS smooth. Metanotum weakly rugulose. Mesepisternum ( Fig. 10E ) with sparse PP over entire surface, IS smooth (IS = 1–6). SCL:MNL:MPL = 1:0.53:0.95. Propodeum: metapostnotum ( Fig. 10F ) gently inclined, with longitudinal ridges on basal half, with distinct tessellation on apical half; the junction between metapostnotum and posterior surface weakly tessellate, not carinate; lateral surface weakly rugulose and distinctly tessellate; posterior surface with lateral carina on lower half. Fore trochanter narrow, longer than wide. Hind tibia without basitibial plate. Hind basitarsus slender, approximately 4.7 × as long as wide. Inner hind tibial spur finely serrate.

ABDOMEN. Discs of T1–T3 with sparse fine PP. T1 smooth except for punctures. T2 basally and apically lineolate, T3–T5 over entire surface. S4 and S6 normal shaped, not modified. S5 gently incurved apically ( Fig. 5N ). S7–S8 ( Fig. 11F ): S7 with triangular median process, apex not exceeding S8; S8 medially weakly projecting, but not forming median process.

GENITALIA ( Fig. 11 A–E). Gonobase short, flat at bottom, ventral arms connected with each other at upper ends; gonocoxite smooth, gently sloped in lateral view, and inner dorsal margin angulate approximately at basal 1/3; gonostylus small, truncated apically in lateral view, located on top of gonocoxite, and with sparse short and a few long hairs; ventral retrorse lobe leaf-shaped, short, with moderately dense short setae ventrally; penis valve with low cleft on top.

Female

Unknown.

Variation

The postgena nearly smooth in five paratypes (holotype and rest of paratypes weakly tessellate).

Distribution

Taiwan.

Flight period

Male: June to September.

Flower records

Not recorded.

Figures

Fig. 4. Hairs on metasomal sterna in species of the atroglaucum subgroup, ♂. A. Lasioglossum (Dialictus) atroglaucum (Strand, 1913). B. Lasioglossum (Dialictus) virideglaucum Ebmer & Sakagami, 1994. C. Lasioglossum (Dialictus) yamanei Murao et al., 2006. D. Lasioglossum (Dialictus) negoroi Murao & Tadauchi, 2008, holotype. E. Lasioglossum (Dialictus) taiwanense Murao sp. nov., holotype.

Fig. 5. S4–S6 in species of the atroglaucum subgroup, ♂. — A–C. Lasioglossum (Dialictus) atroglaucum (Strand, 1913). — D–F. Lasioglossum (Dialictus) virideglaucum Ebmer & Sakagami, 1994. — G–I. Lasioglossum (Dialictus) yamanei Murao et al., 2006 — J–L. Lasioglossum (Dialictus) negoroi Murao & Tadauchi, 2008, paratype. — M–O. Lasioglossum (Dialictus) taiwanense Murao sp. nov., paratype. A, D, G, J, M: S4. B, E, H, K, N: S5. C, F, I, L, O: S6. Dotted area on S5 shows the apical depression. Scale bars: 0.2 mm.

Fig. 11. Lasioglossum (Dialictus) taiwanense Murao sp. nov., paratype, ♂. A. Genitalia in ventral view. B. Genitalia in dorsal view. C. Genitalia in lateral view. D. Gonostylus in dorsal view. E. Ventral retrorse lobe of genitalia. F. S7–S8. Scale bars: A–C, F = 0.2 mm, D–E = 0.1 mm.

Fig. 10. Lasioglossum (Dialictus) taiwanense Murao sp. nov., ♂. A. Lateral habitus. B. Head in frontal view. C. Labrum. D. Mesoscutum. E. Mesepisternum. F. Metapostnotum. A–B, E–F. Holotype. C–D.