Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996

Murao, Ryuki, 2021, Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species, European Journal of Taxonomy 763, pp. 1-74 : 12-14

Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996 Figs 2C, F , 4 , 15A , 17A , 19D , 20A

Lasioglossum (Evylaeus) frigidum Sakagami & Ebmer, 1996: 899 , figs 1–2, 3a–b, 4a–b, 5a, 6b (♀ ♂) (holotype: Systematic Entomology, Faculty of Agriculture, Hokkaido University, Japan, ♀, type locality =Amagamori (in Misawa), Aomori Pref., Honshu, Japan).

Diagnosis

Females are similar to Lasioglossum (Hemihalictus) epicinctus (Strand, 1914) from Taiwan. According to Sakagami & Ebmer (1996), the differences between L. (H.) frigidum and L. (H.) epicinctus are not clearly described.The type specimen of L. (H.) epicinctus at the Senckenberg Deutsches Entomologisches Institut (Müncheberg, Germany) was examined in 2012. Based on this examination, the female of L. (H.) frigidum is separated from L. (H.) epicinctus by the supraclypeal area dimly shiny (IS weakly tessellate), the ridges of metapostnotum long, nearly reaching the posterior margin as in Fig. 4F , and the lineolation of T1 present over the entire surface ( Fig. 15A ). In contrast, in L. (H.) epicinctus , the supraclypeal area weakly shiny (IS nearly smooth), the ridges of metapostnotum short (only present on basal area), and the lineolation of T1 present on basal and apical areas.

Material examined

Paratypes JAPAN – Hokkaido • 2 ♀♀; Abashiri-district, Hamakoshimizu ; 19 Jun.1967; H. Fukuda and K.Yamauchi leg.; MNHAH. – Honshu • 1 ♀; Aomori Pref., Misawa, Amagamori ; 16 Aug. 1986; M. Yamada leg.; MNHAH • 1 ♀; Ibaraki Pref., Muramatsu ; 13 May 1981; M. Takahashi leg.; MNHAH .

Other material

JAPAN – Honshu • 1 ♀; Tottori Pref., Yumiga-hama ; 8 Aug. 1993; Y. Maeta leg.; MNHAH • 1 ♀; same location as for preceding; 6 Sep. 1993; Y. Maeta leg.; MNHAH • 1 ♂; Shimane Pref., Izumo-shi, Sotozono-cho ; 12 Jul. 1994; Y. Maeta and K. Minagi leg.; SULE • 1 ♂; same location as for preceding; 10 Jun. 1995; Y. Maeta and K. Minagi leg.; SULE . – Kyushu • 2 ♀♀; Fukuoka Pref., Itoshima-shi, Shima-machi, Nigino-hama ; 33°35′22.329″ N, 130°8′8.868″ E; 17 Aug. 2013; R. Murao leg.; ELKU • 1 ♂; same location as for preceding; 12 Jul. 2014; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 6 Jun. 2015; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Nishi-ku, Imazunagahama ; 33°36′37.64″ N, 130°15′34.919″ E; 2 Jul. 2006; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 28 Jun. 2009; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 2 Aug. 2009; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 16 Aug. 2011; R. Murao leg.; ELKU • 3♀♀; same location as for preceding; 29 Jun. 2013; R. Murao leg.; ELKU • 6 ♂♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 29 Jun. 2013; Y. Murao leg.; ELKU • 4 ♂♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 17 Aug. 2013; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 17 May 2014; R. Murao leg.; ELKU • 2 ♀♀; Fukuoka Pref., Fukuoka-shi, Nishi-ku, Ikino-matsubara ; 33°34′51.671″ N, 130°18′1.335″ E; 8 Jul. 2013; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Higashi-ku, Shikano-shima , Gebaga-hama ; 33°40′57.566″ N, 130°17′18.933″ E; 20 Sep. 2012; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 15 Aug. 2013; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Kasuya-gun, Shingu-machi, Shingu-hama ; 33°43′8.861″ N, 130°26′15.07″ E; 29 Jul. 2006; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 14 Oct. 2007; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 10 May 2009; R. Murao leg.; ELKU • 39 ♀♀; same location as for preceding; 3 Jun. 2011; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 16 Jul. 2011; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 20 Sep. 2012; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 4 May 2014; R. Murao leg.; ELKU • 3 ♀♀; Fukuoka Pref., Fukutsu-shi, Koinoura-kaigan ; 33°48′00.327″ N, 130°27′02.674″ E; 2 May 2015; R. Murao leg.; ELKU • 5 ♀♀; Kumamoto Pref., Amakusa, Tomioka-shiki ; 19 Jun. 1931; Esaki and Hori leg.; ELKU . – Ryukyus • 1 ♀; Kagoshima Pref., Ôsumi-shotô, Tanega-shima , Hamada; 2 Aug. 1984; Sk. Yamane leg.; KWC • 1 ♀; Tanega-shima Is., Nakatane, Yakutsu ; 14 Aug. 1991; M. Goubara leg.; SULE .

Distribution

Japan (Hokkaido, Honshu, Izu-shotô Islands, Shikoku, Kyushu, northern Ryukyus).

Flight records

Female: April to October.

Male: June to October. The flight records of male are based on the phenological data reported by Minagi et al (2000).

Flower records

Five species in 4 families were reported as floral records in Japan by Sakagami & Ebmer (1996), 8 species in 5 families by Minagi et al. (2000), and 5 species in 4 families by Gôukon (2006). The total number of species including my data is 14 in 6 families as follows. Apiaceae : Coelopleurum gmelinii (DC.) Ledeb. ; Glehnia littoralis F.Schmidt ex Miq. Asteraceae : Hieracium umbellatum L.; Ixeris repens (L.) A.Gray; Melanthera prostrata (Hemsl.) W.L.Wagner & H.Rob. ; Sonchus brachyotus DC. ; Taraxacum officinale Weber ex F.H.Wigg. Brassicaceae : Arabis stelleri DC. var. japonica (A.Gray) F.Schmidt ; Brassica sp. Convolvulaceae : Calystegia soldanella (L.) R.Br.; Cuscuta campestris Yunck. Lamiaceae : Vitex rotundifolia L.f. Rosaceae : Potentilla chinensis Ser. ; Rosa rugosa Thunb.

Habitat

Lasioglossum frigidum has been collected only in coastal sand dunes. One of the collecting sites is shown in Fig. 19D .

Figures

Fig. 2. A, E. Lasioglossum (Hemihalictus) sexstrigatus (Schenck, 1869). A. ♂, lateral habitus. E. ♀, mesepisternum. — B. L. (H.) taeniolellum (Vachal, 1903), ♂, labrum. — C, F. L. (H.) frigidum Sakagami & Ebmer, 1996. C. ♂, cephalic polymorphism. F. ♀, metasomal terga. — D. L. (H.) simplicior (Cockerell, 1931), ♂, cephalic polymorphism. Scale bars: A = 2 mm; B = 0.2 mm; C, E = 0.5 mm; D, F = 1 mm.

Fig. 4. Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996. A. ♀, lateral habitus. B. ♀, head in frontal view. C. ♂, head in frontal view. D. ♀, labrum. E. ♀, mesoscutum. F. ♀, metapostnotum. Scale bars: A = 2 mm; B, E–F = 0.5 mm; C–D = 0.2 mm.

Fig. 15. 1st metasomal tergum, ♀. A. Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996. B. L. (H.) ikudomei sp. nov. C. L. (H.) kiautschouense (Strand, 1910). D. L. (H.) ohei Hirashima & Sakagami, 1966. E. L. (H.) simplicior (Cockerell, 1931). F. L. (H.) smilodon Ebmer & Sakagami, 1994. Scale bars: 1 mm.

Fig. 17. Distribution maps. A. Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996. B. L. (H.) kiautschouense (Strand, 1910). C. L. (H.) ohei Hirashima & Sakagami, 1966. D. L. (H.) simplicior (Cockerell, 1931). E. L. (H.) spectrum sp. nov. F. L. (H.) speculinum (Cockerell, 1925).

Fig. 19. Habitat in Japan. A. Chojyabaru, Kokonoe-machi, Kusu-gun, Oita Pref., Kyushu, Japan. B. Kyushu Univ., Hikosan Exp. St., Soeda-machi, Fukuoka Pref., Kyushu, Japan. C. Kyushu Univ., Hakozaki, Higashi-ku, Fukuoka-shi, Fukuoka Pref., Kyushu Japan. D. Nigino-hama, Itoshima-shi, Fukuoka Pref., Kyushu, Japan.

Fig. 20. Female inner hind tibial spur. A. Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996. B. L. (H.) ikudomei sp. nov. C. L. (H.) kiautschouense (Strand, 1910). D. L. (H.) ohei Hirashima & Sakagami, 1966. E. L. (H.) smilodon Ebmer & Sakagami, 1994. F. L. (H.) spectrum sp. nov. G. L. (H.) speculinum (Cockerell, 1925). H. L. (H.) sphecodicolor Sakagami & Tadauchi, 1995. I. L. (H.) taeniolellum (Vachal, 1903). Scale bars: 0.2 mm.