Lasioglossum (Dialictus) alishanense 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 : 32-37

Lasioglossum (Dialictus) alishanense Murao sp. nov.

urn:lsid:zoobank.org:act:34A726F0-E3B3-4E3F-B6B8-111E08F19BD2

Figs. 13D , 14 G–I, 17, 18, 19B

Diagnosis

This species may be closely related to Lasioglossum problematicum , L. sanitarium , and L. sichuanense , as stated above. For the differences between this species and L. problematicum , see the Key. It is separated from the two other related species by the disc of the male S4 having short and sparse hairs ( Fig. 13D ), the male S5 without an apical depression ( Fig. 14H ), and the shape of gonostylus of male genitalia ( Fig. 18C ).

Etymology

The specific name is derived from the type locality, Mt. Alishan in Taiwan.

Material examined

Holotype

TAIWAN: ♂, Chiayi-Hsien Alishan , 27 Jul. 1966 (T. Tano, ELKU). Paratypes

TAIWAN: 1 ♂, Taiheizan (Taihoku-shû), Toganoo-Minamotojobu-Kussha, 22 Jul. 1932 ( T. Esaki, ELKU); 1 ♂, Chiayi-Hsien Shihtzulu, 29 Jul. 1966 ( T. Tano, ELKU); 3 ♂♂, Chiayi-Hsien Alishan, 27 Jul. 1966 ( T. Tano, ELKU); 1 ♂, Fenchifu, alt. 1405 m, 1 Sep. 1979 (Y. Hirashima, ELKU).

Measurements (n = 6, unit mm)

BL = 5.86–6.86 (6.38 ±0.43), WL = 5.43–6.00 (5.79 ±0.22), HL = 1.39–1.58 (1.51 ±0.07), HW = 1.42– 1.58 (1.52 ±0.06), IOD = 0.23–0.24 (0.23 ±0.01), OOD = 0.27–0.35 (0.31 ±0.03), OCD = 0.23–0.24 (0.24 ±0.01), UOD = 0.90–1.03 (0.98 ±0.05), MOD = 1.02–1.13 (1.08 ±0.05), LOD = 0.61–0.74 (0.69 ±0.05), IAD = 0.24–0.31 (0.27 ±0.03), AOD = 0.16–0.21 (0.19 ±0.02), CAL = 0.24–0.27 (0.25 ±0.01), CPL = 0.35–0.39 (0.37 ±0.02), EL = 0.98–1.10 (1.03 ±0.05), EW = 0.50–0.53 (0.50 ±0.01), GW = 0.28–0.35 (0.33 ±0.03), SPL = 0.32–0.39 (0.36 ±0.02), F1L = 0.15–0.16 (0.15 ±0.01), F2L = 0.27–0.29 (0.28 ±0.01), F3L = 0.29–0.32 (0.30 ±0.01), F2W = 0.16–0.18 (0.16 ±0.01), MsW = 1.55–1.70 (1.60 ±0.06), SCL = 0.35 (0.35 ±0.00), MNL = 0.18–0.20 (0.19 ±0.01), MPL = 0.31–0.38 (0.34 ±0.03), MtW = 1.15–1.40 (1.29 ±0.09).

Description

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 dark brownish translucent; tibial spur yellow; metasomal terga narrowly dark brownish translucent apically. Wings transparent, veins and stigma brown.

PUBESCENCE. Body hairs whitish, and covered with elect 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. S2–S4 medioapically with sparse erect hairs; in addition, S4 lateroapically with sparse short hairs. S5 with dense, brush-like, and brownish hairs along apical margin.

HEAD. As long as wide; HW:HL = 1:0.99. Vertex rounded in frontal view. MOD:UOD:LOD = 1:0.90:0.64. IOD:OOD:OCD = 1:1.33:1.01. IAD:AOD = 1:0.70. Ocellocular areas, paraocular areas and frons dull, with reticulate PP. Supraclypeal area weakly convex, dull, with sparse PP, IS distinctly tessellate (IS = 0.5–3). CPL:CAL = 1:0.68. Clypeus nearly flat, its sculptures similar to supraclypeal area, IS = 1–4. EW:GW = 1:0.64. Malar space linear. Occiput not carinte. Postgena nearly smooth. Mandible edentate. Labrum ( Fig. 17C ) without basal elevation and distal process. Antenna long, reaching metasoma. F2L:F2W = 1:0.57; flagellum nearly flattened ventrally.

THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Mesoscutum ( Fig. 17D ) with dense PP on marginal area, gradually sparse toward anterior to medial areas; IS weakly tessellate (IS = 0.5–1.5 on marginal area, 0.5–2.5 on anterior to medial area); parapsidal line a narrow groove. Mesoscutellum with dense PP over entire surface, IS smooth (IS = 1–2). Metanotum distinctly tessellate, not coarsely rugulose. Mesepisternum ( Fig. 17E ) with sparse PP over entire surface, IS smooth (IS= 1–6.5). SCL:MNL:MPL = 1:0.54:0.98. Propodeum: metapostnotum ( Fig. 17F ) gently inclined, with nearly longitudinal ridges not attaining posterior margin; junction between propodeal dorsum and shield smooth, not carinate; lateral surface weakly rugulose and distinctly tessellate; posterior surface weakly tessellate, with lateral carina on lower 1/3 and without oblique carina. Fore trochanter narrow, longer than wide. Hind tibia without basitibial plate. Hind basitarsus slender, approximately 4 × 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–T2 smooth except for punctures. T3–T5 with weak lineolation over entire surface. Apical margin of S4–S5 incurved ( Fig. 14G, H ); shape of S5 as in L. problematicum . S6 normally shaped, not modified. S7–S8 ( Fig. 18E ): S7 with narrow median process, apex as high as top of S8; S8 without median process.

GENITALIA ( Fig. 18 A–D). Gonobase flat at bottom, ventral arms not connected with each other at upper ends; gonocoxite smooth, gently sloped in lateral view, and inner dorsal margin gently angulate approximately at basal 1/3; gonostylus large, similar to that of L. problematicum in shape, located on top of gonocoxite, and with dense setae on inner surface; ventral retrorse lobe tongue-like, moderately long but not reaching gonobase, with dense short setae ventrally and relatively long blunt setae laterally; penis valve with high cleft on top.

Female

Unknown.

Distribution

Taiwan.

Flight period

Male: late July to September.

Flower record

Not recorded.

The morio group

Species included in eastern Asia:

L. briseis Ebmer, 2005

L. circe Ebmer, 1982

L. ellipticeps (Blüthgen, 1923)

L. eomontanus Ebmer, 2006

L. lambatum Fan & Ebmer, 1992

L. moros Ebmer, 2002

L. spinosum Ebmer, 1982

Only one species, listed below, is known to occur on the Korean Peninsula.

Diagnosis and comments

This group in the present paper corresponds to Evylaeus (Smeathhalictus) Warncke sensu Pesenko (2007a) . According to Pesenko’s key (2007a), this group is separated from the other Palaearctic groups by a combination of the following character states: 1) body small, body length = 4.0– 6.5 mm in both sexes, 2) head usually longer than wide in both sexes, 3) male antenna long, reaching propodeum, 4) male F2 1.5–1.7 × as long as its diameter, 5) female mesocutum and mesopleuron punctate, 6) length of metapostnotum as long as or longer than mesoscutellum in both sexes, 7) female metapostnotum striate, more or less shiny, 8) posterior surface of propodeum usually with complete lateral carina in both sexes, 9) male metasoma elongate, 10) female T1 apically with fine lineolate or shagreened, 11) T2–T4 with apical fimbriae or developed lateral spots in both sexes, 12) male metasomal sterna not modified, 13) gonostylus of male genitalia small, rounded triangular, trapeziform or elongate elliptical, and not narrowed at base and 14) ventral retrorse lobe of male genitalia rounded, elliptical, sometimes triangular. However, it is very difficult or impossible to separate from all other group based on these character states. This group needs a revision of the diagnostic characters through detailed morphological and phylogenetic studies.

Distribution

Palaearctic to northern Oriental Region. It is diverse in the western Palaearctic Region.

Figures

Fig. 13. Hairs on metasomal sterna in species of the problematicum subgroup, ♂. A. Lasioglossum (Dialictus) problematicum (Blüthgen, 1923). B. Lasioglossum (Dialictus) sanitarium (Blüthgen, 1926). C. Lasioglossum (Dialictus) sichuanense Fan & Ebmer, 1992. D. Lasioglossum (Dialictus) alishanense Murao sp. nov., holotype.

Fig. 14. S4–S6 in species of the problematicum subgroup, ♂. A–C. Lasioglossum (Dialictus) problematicum (Blüthgen, 1923). D–F. Lasioglossum (Dialictus) sanitarium (Blüthgen, 1926). G–I. Lasioglossum (Dialictus) alishanense Murao sp. nov., paratype. A, D, G: S4. B, E, H: S5. C, F, I. S6: Dotted area on S5 shows the apical depression. Scale bars: 0.2 mm.

Fig. 18. Lasioglossum (Dialictus) alishanense Murao sp. nov., paratype, ♂. A. Genitalia in ventral view. B. Genitalia in dorsal view. C. Genitalia in lateral view. D. Ventral retrorse lobe of genitalia. E. S7–S8. Scale bars: A–C, E = 0.2 mm, D = 0.1 mm.

Fig. 17. Lasioglossum (Dialictus) alishanense 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. Paratype.