Abstract
Twelve species in total are recognized for the subgenus Lasioglossum (Dialictus) Robertson, 1902 from Japan, the Korean Peninsula and Taiwan. Lasioglossum (Dialictus) alishanense sp. nov. and L. (D.) taiwanense sp. nov. from Taiwan, are described as new. Four species are recorded from the following localities for the first time: L. (D.) miyabei Murao, Ebmer & Tadauchi, 2006 from the Korean Peninsula (South Korea); L. (D.) ellipticeps (Blüthgen, 1923), L. (D.) virideglaucum Ebmer & Sakagami, 1994 and L. (D.) viridellum (Cockerell, 1931) from South Korea. Lasioglossum (Dialictus) atroglaucum (Strand, 1913) is redescribed, L. (D.) ellipticeps, L. (D.) problematicum (Blüthgen, 1923), L. (D.) virideglaucum, and L. (D.) viridellum are supplementary described. A key to species is provided. Bionomical data, such as flight and flower records or habitat, are reported for some species. The distributions of all species are mapped. DNA barcodes of L. (D.) miyabei, L. (D.) pseudannulipes (Blüthgen, 1925), and L. (D.) virideglaucum are provided
Highlights
The cosmopolitan bee genus Lasioglossum Curtis, 1833 (Halictidae, Halictinae) is a highly diverse group and includes approximately 1800 species worldwide (Ascher & Pickering 2015). This group contains diverse social structures, and are some of the most abundant bees in the warm temperate zone and parts of the Neotropical Region (Sakagami et al 1967; Sakagami & Fukuda 1973; Yamauchi et al 1974; Ikudome 1992; Maeta et al 2003; Gôukon 2006; etc.). It is divided into two informal group on the basis of the degree of strength of the second submarginal vein of the female fore wing (Michener 2000): 1) the Hemihalictus series includes all subgenera with a weak second submarginal vein (Acanthalictus Cockerell, 1924, Austrevylaeus Michener, 1965, Capalictus Pauly, European Journal of Taxonomy 137: 1–50 (2015)
There is no agreement among taxonomists with regard to the number and extent of the subgeneric classification of Lasioglossum and it is not necessarily applied when classifying the male
In the course of a collaborative study of the Asian Lasioglossum fauna, we examined the L. (Dialictus) specimens collected from Japan, the Korean Peninsula and Taiwan
Summary
The cosmopolitan bee genus Lasioglossum Curtis, 1833 (Halictidae, Halictinae) is a highly diverse group and includes approximately 1800 species worldwide (Ascher & Pickering 2015) This group contains diverse social structures (solitary, parasocial, and primitively eusocial, etc., reviewed in, e.g., Michener 1974; Yanega 1997), and are some of the most abundant bees in the warm temperate zone and parts of the Neotropical Region (Sakagami et al 1967; Sakagami & Fukuda 1973; Yamauchi et al 1974; Ikudome 1992; Maeta et al 2003; Gôukon 2006; etc.). They will probably shed light on our understanding of the relationships among taxa, evolutionary patterns of sociality and the strict delimitation of genera and subgenera
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