Lasioglossum (Dialictus) meakanense Murao & Tadauchi, 2009

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 : 11-12

Lasioglossum (Dialictus) meakanense Murao & Tadauchi, 2009

Figs 3A , 26A , 28B

Lasioglossum (Evylaeus) meakanensis Murao & Tadauchi, 2009a (erroneous spelling): 113–117 (holotype: ELKU, ♂; type locality: Hokkaido, Japan).

Diagnosis

This species is separated from related species by the combination of the following characters: female supraclypeus with sparse PP (IS = 1–4.7), male labrum without basal elevation, and male S4–S5 (particularly S5) laterally with hair tufts that are longer than the surrounding hairs.

Distribution

Japan (Hokkaido). This species has only been collected from Mt. Meakan-dake in the eastern part of Hokkaido.

Flight records

Both sexes: August.

Flower records

Campanula lasiocarpa Cham. (Campanulaceae) .

The atroglaucum group

Species included:

L. alishanense Murao sp. nov.

L. atroglaucum ( Strand, 1913)

* L. callophrys Ebmer, 2002

* L. kintonense (Blüthgen, 1926)

* L. mystaphium Ebmer, 2002

L. negoroi Murao & Tadauchi, 2008

L. problematicum (Blüthgen, 1923)

L. taiwanense Murao sp. nov.

L. sanitarium (Blüthgen, 1926)

* L. sauterum Fan & Ebmer, 1992

L. sichuanense Fan & Ebmer, 1992

* L. subversicolum Fan & Ebmer, 1992

* L. versicolum Fan & Ebmer, 1992

L. virideglaucum Ebmer & Sakagami, 1994

L. yamanei Murao, Ebmer & Tadauchi, 2006

The members of this group marked with an asterisk are tentatively included because the male has not yet been described. Seven species in total are known from the study area: three from Japan, one from Japan and the Korean Peninsula, and three from Taiwan.

Diagnosis

Species of the atroglaucum group may be strictly characterized by a combination of the following character states: 1) male F2 approximately 1.7–2.3 × as long as F1; 2) mesepisternum punctate over entire surface in both sexes (e.g., Fig. 6E ); 3) male S4 or S5 modified, or with unique hair tufts as in Figs 4 , 13–14 ; and 4) penis valve of male genitalia with high or low cleft on top ( Figs 7C , 9C , 11C , 16C , 18C ). The diagnostic characters of this group are also shown in Ebmer (2002) and Pesenko (2007a, as subgenus Glauchalictus Pesenko, 2007 ).

In addition, this group can be classified into two subgroups. The atroglaucum subgroup ( L. atroglaucum , L. negoroi , L. taiwanense sp. nov., L. virideglaucum , and L. yamanei ) is characterized by a combination of the male S5 with apical depression and without brush-like hairs ( Fig. 5B, E, H, K, N ), and the gonostylus of male genitalia without setae on the inner surface. The problematicum subgroup ( L. alishanense sp. nov., L. problematicum , L. sanitarium , and L. sichuanense ) is characterized by the male S5 with brushlike hairs along apical margin ( Figs 13 , 14B, E, H ) and the gonostylus of male genitalia with dense short setae on the inner surface ( Fig. 16D ). The latter subgroup can be regarded as a monophyletic group by the characters of the male S5 and genitalia. These character states are unique in the subgenus and are considered to be autapomorphies.

Distribution

This group is distributed from the Far East to southern Asia. It is diverse in the northern Oriental Region.

Comments

Lasioglossum miyabei Murao, Ebmer & Tadauchi, 2006 , L. pronotale Ebmer, 2002 , and L. xizangense Fan & Ebmer, 1992 are included as members of the atroglaucum group sensu Ebmer (2002) and Murao et al. (2006). These three species, however, do not share character states 3) and 4). They are considered to constitute another, separate group of its own.

Figures

Fig. 3. Distribution maps. A. Lasioglossum (Dialictus) pseudannulipes (Blüthgen, 1925) and L. (D.) meakanense Murao & Tadauchi, 2009 in Japan (●: L. pseudannulipes. ■: L. meakanense). B. Lasio- glossum (Dialictus) viridellum (Cockerell, 1931) in the Korean Peninsula.

Fig. 26. Photographs for keys: PP on supraclypeal area of female. A. Lasioglossum (Dialictus) meakanense Murao & Tadauchi, 2009. B. L. (D.) ellipticeps (Blüthgen, 1923).

Fig. 28. Photographs for keys: hairs on metasomal sterna of male. A. Lasioglossum (Dialictus) miyabei Murao et al., 2006. B. L. (D.) meakanense Murao & Tadauchi, 2009.

Fig. 6. Lasioglossum (Dialictus) atroglaucum (Strand, 1913), ♂. A. General habitus. B. Head in frontal view. C. Labrum. D. Mesoscutum. E. Mesepisternum. F. Metapostnotum.

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. 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. 7. Lasioglossum (Dialictus) atroglaucum (Strand, 1913), ♂. 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. 9. Lasioglossum (Dialictus) virideglaucum Ebmer & Sakagami, 1994, ♂. 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. 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. 16. Lasioglossum (Dialictus) problematicum (Blüthgen, 1923), ♂. A. Genitalia in ventral view. B. Genitalia in dorsal view. C. Genitalia in lateral view. D. Gonostylus in inner-lateral view. E. Ventral retrorse lobe of genitalia. F. S7–S8. Scale bars: A–C, F = 0.2 mm, D–E = 0.1 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. 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.