Siobla sturmii (Klug, 1817)

Shinohara, Akihiko, Wei, Meicai & Niu, Gengyun, 2013, Revision of Siobla (Hymenoptera, Tenthredinidae) from Japan, Zootaxa 3746 (1), pp. 1-40 : 21-22

Siobla sturmii (Klug, 1817)

( Figs 3a–b , 4 j–l, 5q–r, 6h, 7h, 8h, q, 10g, 12f–i)

Tenthredo sturmii Klug, 1817: 116 .

Macrophya pacifica Smith, 1874: 378 , syn. nov.

Siobla pacifica: Nakagawa, 1899: 204 ; Takeuchi, 1936: 86 (in part);?Abe and Togashi, 1989: 555; Lelej &Taeger, 2007: 958; Taeger et al., 2010: 585; Lelej, 2012: 100.

“ Siobla ruficornis Cameron ?”: Takeuchi, 1919b: 13 (in part).

Siobla sturmii var. pacifica: Malaise, 1931a: 121 ; Malaise, 1934: 24, 26.

Siobla sturmii: Takeuchi, 1931: 31 ;?Naito, 1982: 574; Takeuchi, 1956: 77 (in part); Lee et al., 2000: 119; Katayama, 2004: 96 (in part); Naito et al., 2004: 57 (in part); Lee et al., 2010: 165; Taeger et al., 2010: 585; Niu & Wei, 2010: 50.

Siobla ruficornis: Takeuchi, 1936: 85 (in part);?Togashi, 1965: 246; Naito, 1982: 574; Abe and Togashi, 1989: 555 (in part); Yoshida, 2006: 91;?Togashi, 2008: 490. Not Cameron (1876).

Siobla sturmii sturmii: Zhelochovtsev & Zinovjev, 1996: 368 .

Siobla sturmii subsp. pacifica: Zhelochovtsev & Zinovjev, 1996: 368 .

[Only East Asian references are given.]

Distribution. Japan (Hokkaido, southern Kuriles, Honshu, Kyushu), Korea, Russian Far East (Primorskiy kray; Sakhalin), Siberia, Europe. New records from Kyushu and Sakhalin.

Primary type examined. Lectotype of Macrophya pacifica hereby designated ( Fig. 4 j–l): ♀, “ Type H. T.” “B. M. TYPE HYM. 1.246” “ Macrophya pacifica , Type, Smith” “Kb.” “t. 9/17.” “BMNH(E) #651765” (BMNH).

Other material examined (see Appendix). 165 specimens (57♀ and 108♂).

Variation. The length varies from 9.5 to 12.5 mm in the female and 9.5 to 12.0 mm in the male. The Japanese specimens examined are quite variable in colour pattern, those from Hokkaido usually being darker than those from Honshu and Kyushu. In the female, the clypeus, the metapleuron, and the hind coxa, trochanter and trochantellus are usually entirely black in the Hokkaido specimens, whereas ventral half of the clypeus and the other parts given above are frequently marked with reddish brown ( Fig. 12 h, i) in the Honshu and Kyushu specimens, particularly in the specimens from southwestern Honshu. The abdomen in the Hokkaido specimens has only the tergum 2 and part of the tergum 3 reddish brown, while the abdomen in the Honshu specimens has the terga 2 and 3 mostly reddish brown and sometimes the posterior margin of the tergum 1 and the anterior margin of the tergum 4 are also reddish brown. The abdomen in the Kyushu specimens has the terga 2 to 4 almost entirely reddish brown. The male shows some colour variation almost only in the extent of reddish brown areas on the abdomen. The Hokkaido and northern Honshu specimens tend to be darker but variable; the darkest specimens have only parts of the terga 2 and 3 narrowly reddish brown, whereas the lightest specimens have the terga 2 to 4 almost entirely reddish brown. The males from southwestern Honshu and Kyushu almost constantly have the terga 2 to 5 (and often anterior part of 6) reddish brown.

Remarks. This species belongs to the S. sturmii group (Niu & Wei 2010). The Japanese specimens are variable in colouration as discussed above. They are usually similar to normal European specimens, such as Klug’s lectotype (see photographs in Taeger & Blank 2011), but some specimens resemble S. ruficornis ( Fig. 12a –e). Siobla sturmii can be distinguished from S. ruficornis by the shape of the head in dorsal view ( Fig. 12 f) and that of the sawsheath in lateral view ( Fig. 12 g). The features of the lancet, harpe and penis valve are also different.

Among the Japanese congeners, S. sturmii looks similar to S. jucunda and S. japonica , but S. sturmii is separated from these species by the colour of the antenna and hind femur. In S. sturmii , the female antenna is entirely or almost entirely reddish brown, the male antenna has the scape, pedicel, and base of the flagellomere 1 black and the flagellomeres 2 to 9 entirely reddish brown, and the hind femur is basally reddish brown. In S. jucunda , the basal three antennomeres are mostly black in the female, the basal four antennomeres are mostly black in the male, and the hind femur is entirely black. In S. japonica , the antenna and the hind femur are entirely or almost entirely black.

Smith (1874) described the female and male of Macrophya pacifica from North Japan, but Kirby (1882) was not able to locate any male specimens in the London collection and listed one female specimen as the type. Here we designate the female specimen as lectotype. An examination of the lectotype has revealed that it is conspecific with S. sturmii and we hereby propose to synonymize S. pacifica with S. sturmii .

As discussed elsewhere, “ Siobla ruficornis Cameron ?” of Takeuchi (1919b) was a mixture of S. takeuchii and most probably the male of S. sturmii . Takeuchi (1956) listed four specimens from Maruyama, Kunashiri Island. This series of specimens kept in HU, Sapporo, comprises three specimens of S. sturmii and one specimen of S. jucunda (see Appendix).

Mainly in local faunal lists, Togashi (1961, 1971, 1978, 1998b, 2002b), Okutani (1972, 1974b), Togashi et al. (1980), Otsuka (1984), Nambu (1992, 1998), and Katayama et al. (2007) included “ S. sturmii ” and Nambu (1992, 1998) and Naito et al. (2004) referred to “ S. ruficornis ”. These references may actually include S. japonica , S. jucunda , or S. sturmii . Examination of their original material is necessary to establish its true identity.

Figures

FIGURE 3. a – d. Siobla species, dorsal view. a. S. sturmii, ♀, Sounkyo; b. S. sturmii, ♂, Asahidake-onsen; c. S. takeuchii sp. nov., holotype, ♀; d. S. takeuchii sp. nov., paratype, ♂, Mt. Kenashiyama. Scale bar = 1 mm. e – g. Lectotype of S. ferox. e. Labels; f. Dorsal view; g. Lateral view. h – i. S. ferox (Lectotype of S. grandis). h. Labels; i. Dorsal view.

FIGURE 4. a – c. Holotype of S. ferox var. hirasana. a. Labels; b. Dorsal view; c. Lateral view. d – f. Lectotype of S. jucunda. d. Labels; e. Dorsal view; f. Lateral view. g – i. Holotype of S. metallica. g. Labels; h. Dorsal view; i. Lateral view. j – l. S. sturmii (Lectotype of Macrophya pacifica). h. Labels; i. Dorsal view; j. Lateral view.

FIGURE 12. a – c. Siobla ruficornis (Gimmerthal, 1834) (a syntype of Eriocampa ruficornis Cameron, 1876). a. Labels; b. Dorsal view; c. Lateral view. d – e. S. ruficornis. d. Head of female in dorsal view; e. Ovipositor sheath in lateral view. f – i. S. sturmii. f. Head of female in dorsal view; g. Ovipositor sheath in lateral view; h. Head of female in frontal view; i. Ventral view of female.