Lasioglossum (Evylaeus) zipangu Ebmer & Sakagami, 1994

Murao, Ryuki, Tadauchi, Osamu, Goubara, Masashi & Maeta, Yasuo, 2010, Taxonomy of the carinaless group of Lasioglossum (Evylaeus) (Hymenoptera, Halictidae) from the Ryukyu Islands, Japan, with description of seven new species, Zootaxa 2669, pp. 1-33 : 26-27

Lasioglossum (Evylaeus) zipangu Ebmer & Sakagami, 1994

( Figs. 15 , 16 )

Lasioglossum (Evylaeus) zipangu Ebmer & Sakagami , in Ebmer et al., 1994, Bull. Fac. Agr. Shimane Univ., 28: 31–32 [female, Japan: Taketomi-jima, Okinawa Pref.]; Tadauchi et al., 1998, Nat. Hist. Bull. Ibaraki Univ., 2: 236; Ikudome, 1999, Ident. Guide Aculeata Nansei Is., Jap.: 587.

Redescription (male: previously unknown). Female. Body length 5.2–5.8 mm, wing length 4.8–5.1 mm (n= 5).

Color. Tegula brown or yellowish brown translucent. Posterior margins of metasomal terga narrowly yellowish brown translucent.

Pilosity. T1 ( Fig. 16 C) medially with dense simple and short hairs. Metasomal terga with neither basal hair bands nor apical fimbriae.

Structure. Head wider than long; head length/width ratio 0.93–0.97 (n= 10). Interocellar distance subequal to ocellocular distance. Frons and paraocular area dull, reticulate-punctate. Supraclypeal area ( Fig. 15 B) dull, with moderately dense PP; IS with distinct tessellation. Clypeal length 1.4x distance between lower rim of antennal socket and upper margin of clypeus, with moderately dense PP on upper half, and with moderately dense larger shallow PP on lower half; IS with distinct tessellation on upper half, and smooth on lower half. Basal area of labrum 2.7x as wide as long; lateral projections of distal process small and rounded; keel of distal process moderately broad, apically bluntly pointed in frontal view. Scape length 0.6–0.7 mm (n= 5). Mesoscutum ( Fig. 15 C, D) dull, with dense PP and IS with distinct tessellation on the entire surface. Mesoscutellum ( Fig. 15 E) similar to mesoscutum in sculptures. Mesepisternum ( Fig. 15 F) shiny, with dense PP on upper area, and with coarse rugulae on lower area. Propodeal dorsum ( Fig. 15 N) 0.7x mesoscutellum, and 1.2x as long as metanotum, dorsomedially with irregular sinuate ridges attaining to posterior margin, and dorsolaterally with longitudinal ridges; propodeal side with weak rugulae; lateral slope and shield with weak tessellation. Inner hind tibial spur ( Fig. 15 O) with 3–6 teeth (n= 20). T1 ( Fig. 16 C) with distinct lineolation on the entire surface, and medially with dense fine PP. T2–T4 similar lineolation with T1 on the entire surface.

Male. As in female except as follows. Body length 3.8–4.8 mm, wing length 3.4–4.3 mm (n= 5).

Color. Fore tibia yellow or yellowish brown on outer surface.

Pilosity. Lower paraocular area with moderately dense tomentum. S4–S5 posterolaterally with fine branched hairs, moderately dense and long (as in Fig. 6 B).

Structure. Head length/width ratio 0.90–0.92 (n= 5). Clypeal length 1.5x distance between lower rim of antennal socket and upper margin of clypeus. Basal area of labrum 4x as wide as long; distal process absent.

Scape length 0.4–0.5 mm (n= 5), F2 1.3x F1. Mesoscutum ( Fig. 15 I, J) shiny; IS anteriorly and medially with weak tessellation, posteriorly smooth. Mesoscutellal IS smooth. Mesepisternum ( Fig. 15 L) with sparse PP on upper area, and with moderately dense shallow PP on lower area. Propodeal dorsum ( Fig. 15 Q) 0.8x mesoscutellum, and 1.4x metanotum, with longitudinal ridges on the entire surface; dorsomedial ridges present on basal half; dorsomedial area apically, and shield nearly smooth. Basitibial plate of hind legs without carina marginally. T1 ( Fig. 16 D) basally and apically with weak lineolation. T2 similar lineolation with T1 on only apically or without lineolation on the entire surface. S7–S8 ( Fig. 16 H): S7 with moderately long, apically acute median process; S8 without median process. Genitalia as in Fig. 16 E–G. Gonobasal ventral arm ringshaped, and not connected to each other at apical ends; bottom nearly flat. Gonocoxite with distinct tessellation on apically, and with weak longitudinal lineolation on inner medial area in dorsal view. Gonostylus rounded apically in lateral view, with sparse short hairs. Retrorse lobe ( Fig. 16 G) long, apically wider than basally, and with moderately dense short hairs on its surface.

Remarks. Within the sexstrigatum -group, this species is similar to Lasioglossum (Evylaeus) latifacies sp. nov. from the southern Ryukyus. For the differences between both species see the key. So far as the first author surveyed in Iriomote-jima, this species was found from cultivated land to subtropical forest.

Distribution. Japan (central and southern Ryukyus: Okinawa-jima, Miyako-jima, Ikema-jima, Taramajima, Irabu-jima, Ishigaki-jima, Taketomi-jima, Iriomote-jima).

Flight records. Female: January to October. Male: May to September.

Flower records. The flowering plants visited by this species were 18 species in 15 families listed as follows. Anacardiaceae : Mangifera indica . Aquifoliaceae : Ilex rotunda . Asteraceae : Ixeris japonica ; Ix. repens ; Youngia japonica . Boraginaceae : Heliotropium foertherianum . Ericaceae : Vaccinium wrightii . Euphorbiaceae : Mallotus japonicus . Fabaceae : Pueraria montana . Hernandiaceae : Hernandia nymphaeifolia . Polygonaceae : Antigonon leptopus . Primulaceae : Lysimachia mauritiana . Rosaceae : Rhaphiolepis indica var. umbellata ; Rosa multiflora . Rutaceae : Murraya paniculata . Sapindaceae : Allophyllus timorensis . Styracaceae : Styrax japonica . Verbenaceae : Vitex bicolor .

Specimens examined. Holotype: female, Taketomi-jima, Okinawa Pref., Ryukyus, JAPAN, 8. iii. 1984 (K. Yamauchi, ELKU). Paratypes: [Ryukyus: JAPAN] 2 females, same data as the holotype. Other material: Okinawa-jima, Okinawa Pref.: 1 female, Nakagusuku, 17. iii. 1953 (T. Shiraki, ELKU). Miyako-jima, Okinawa Pref.: 1 female, 17. vii. 1987 (SK. Yamane, SCMH); 1 female, Botanical Garden, Hirara, 26. v. 1974 (H. Makihara, ELKU); 1 female, Hirara, 9. iii. 1953 (T. Shiraki, ELKU); 1 female and 2 males, Karimata, 2. ix. 1958 (T. Hidaka, ELKU); 5 females, Shimoji, 7. iii. 1953 (T. Shiraki, ELKU). Tarama-jima, Okinawa Pref.: 2 females, 19. vii. 1987 (SK. Yamane, SCMH); 2 females and 3 males, Shinokawa-hama, 5. viii. 1987 (C. Nozaka, RMPC); 1 male, Unjo-ontake, 9. viii. 1987 (C. Nozaka, RMPC). Irabu-jima, Okinawa Pref.: 1 female, Toguti-no-hama, 4–5. viii. 1987 (C. Nozaka, RMPC). Ikema-jima, Okinawa Pref.: 1 female, 27. iii. 1995 (K. Yamauchi, SCMH). Ishigaki-jima, Okinawa Prerf.: 1 female, Ishigaki-shi, 3. v. 1970 (K. Yamauchi, SCMH); 1 female, Kabira, 12. ii. 1953 (T. Shiraki, ELKU); 3 females, Kainan, 8. ii. 1953 (T. Shiraki, ELKU), 24. ii. 1953 (T. Shiraki, ELKU); 1 female, Mt. Banna-dake, 26. viii. 1958 (T. Hidaka, ELKU); 1 female, Ôhama, 6. ii. 1953 (T. Shiraki, ELKU); 2 females, Shiraho, 26. ii. 1953 (T. Shiraki, ELKU); 1 female, Torogawa, 17. iii. 1964 (M. Yoshimoto, ELKU). Taketomi-jima, Okinawa Pref.: 7 females, same data as the holotype. Iriomote-jima, Okinawa Pref.: 28 females and 3 males, 25–26. iii. 1985 (K. Yamauchi, SCMH), 12– 15. vii. 2002 (Y. Maeta, MCDS), 6. iv. 2003 (Y. Maeta, MCDS), 7–11. vi. 2004 (Y. Maeta, MCDS), 16–17. iii. 2005 (Y. Maeta, MCDS), 14–17. iv. 2005 (Y. Maeta, MCDS), 18–22. v. 2005 (Y. Maeta, MCDS), 10–13. x. 2005 (Y. Maeta, MCDS), 22–27. vii. 2007 (Y. Maeta, MCDS); 4 females, Amitori, 22. iii. 1985 (M. Iwata, ALKK), 25. v. 1999 (M. Iwata, ALKK); 6 females, Funaura, 15. iii. 2005 (R. Murao, RMPC), 17. iii. 2005 (R. Murao, RMPC); 1 female, Komi, 20. i. 1953 (T. Shiraki, ELKU); 1 female, Marantu, 7. ii. 2005 (M. Hannan, MCDS); 1 female, Ôtomi-rindô, 16. iii. 2005 (R. Murao, RMPC); 4 females and 4 males, Painumaya, 26. vii. 2004 (M. Hannan, MCDS), 27. vii. 2004 (M. Hannan, MCDS), 6. viii. 2004 (M. Hannan, MCDS); 3 females, Shirahama-rindô, 15. iii. 2005 (R. Murao, RMPC); 1 female, Sonai, 15. iii. 2005 (R. Murao, RMPC); 1 female, Urauchi-kawa, 16. iii. 1995 (K. Yamauchi, SCMH).

Figures

FIGURE 6. Lasioglossum (Evylaeus) canaliculatum Murao, sp. nov. A, C: holotype, female. B, D, E – H: paratype, male. A: head in frontal view. B: metasomal sterna. C, D: first metasomal tergum (left half, sculpture; right half, hair pattern). E – G: male genitalia (E: left, ventral view; right, dorsal view. F: lateral view. G: retrorse lobe). H: seventh and eighth metasomal sterna. Scale bars: A, B, C, D, 1 mm; E, F, H, 0.2 mm; G, 0.1 mm.

FIGURE 15. Lasioglossum (Evylaeus) zipangu Ebmer & Sakagami. A – F: holotype, female. M – O: paratype, female. G – L, P, Q: male. A, G: lateral habitus. B, H: lower face. C, I: mesoscutum. D, J: sculpture on mesoscutum. E, K: mesoscutellum. F, L: mesepisternum. M, P: labrum. N, Q: propodeal dorsum. O: inner hind tibial spur. Scale bars: N, 0.5 mm; M, O – Q, 0.2 mm.

FIGURE 16. Lasioglossum (Evylaeus) zipangu Ebmer & Sakagami. A, C: holotype, female. B, D, E – H: male. A, B: head in frontal view. C, D: first metasomal tergum (left half, sculpture; right half, hair pattern). E – G: male genitalia (E: left, ventral view; right, dorsal view. F: lateral view. G: retrorse lobe). H: seventh and eighth metasomal sterna. Scale bars: A – D, 1 mm; E, F, H, 0.2 mm; G, 0.1 mm.