Lasioglossum (Acanthalictus), Cockerell, 1924

Murao, Ryuki, Lee, Heung-Sik & Tadauchi, Osamu, 2014, Lasioglossum (Acanthalictus) dybowskii (Hymenoptera, Halictidae) newly recorded from South Korea, with a checklist of the genus Lasioglossum in Korean Peninsula, Journal of Hymenoptera Research 38, pp. 141-153 : 142-143

The subgenus Acanthalictus Cockerell, 1924

Acanthalictus Cockerell, 1924: 184. Type species: Halictus dybowskii Radoszkowski, 1876, by original designation.

Evylaeus (Acanthalictus) : Pesenko 2007a: 16-17.

Diagnosis.

This subgenus is characterized in having the following features: 1) lower margin of clypeus reflected forward ( Fig. 5 ); 2) female mandible with two apical teeth ( Fig. 6 ); 3) basal elevation of male labrum high swelled, with longitudinal furrow ( Fig. 8 ); 4) male S2 gently swelled on apical part ( Fig. 15 ); and 5) male S6 expanded apically as in Fig. 20 ( Michener 2007; Pesenko 2007a). In this study, we noticed an additional apparently unique character, namely the female labrum lacking basal elevation ( Fig. 7 ). The comparative morphological study of labrum has not been performed yet in the genus Lasioglossum , but this character state may be an autoapomorphy.

Figures

Figures 1 - 6. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 1 - 2 lateral habitus 3 - 4 head in frontal view 5 clypeus in lateral view 6 teeth of mandible. 1, 3, 6 female; 2, 4, 5 male.

Figures 7 - 12. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 7 - 8 labrum 9 lateral surface of pronotum 10 mesoscutum 11 mesepisternum 12 metapostnotum. 7, 9 - 12 female; 8 male.

Figures 13 - 18. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 13 - 14 1 st to 3 rd metasomal terga 15 2 nd metasomal sterna in lateral view (arrow indicate) 16 setae on metasomal sterna 17 female on the flower of Angelica anomala 18 collecting site at Mt. Gariwangsan, South Korea. 13, 17 female; 14 - 16 male.

Figures 19 - 25. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 19 inner hind tibial spur 20 6 th metasomal sternum 21 7 - 8 th metasomal sterna 22 genitalia in ventral view 23 genitalia in dorsal view 24 genitalia in lateral view 25 ventral retrorse lobe of genitalia, 19 female; 20 - 25 male. Scale bars: 19, 25 = 0.25 mm; 20 - 24 = 0.5 mm.