Siobla jucunda Mocsary 1909

• Main Authors: Shinohara, Akihiko, Wei, Meicai, Niu, Gengyun
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Hymenoptera; Tenthredinidae; Siobla; Siobla jucunda; Black Head; Primorskiy; Sakhalin
• Online Access: https://zenodo.org/record/6148877; https://doi.org/10.5281/zenodo.6148877

Siobla jucunda (Mocsáry, 1909) (Figs 2 c–d, 4 d–f, 5 k–l, 6 e, 7 e, 8 e, n, 10 h) Encarsioneura jucunda Mocsáry, 1909, p. 15. Siobla sturmii: Takeuchi, 1931: 31 (in part?); Togashi, 1955: 26; Takeuchi, 1956: 77 (in part); Togashi, 1965: 246 (in part), plate 123, 30; Okutani, 1982: 411; Naito, 1982: 574; Katayama, 2004: 96 (in part); Yoshida, 2006: 91; Togashi, 2008: 490 (in part), plate 142, 2538. Not Klug (1817). Siobla similis var. jucund a: Malaise, 1934: 26. Siobla ruficornis: Takeuchi, 1936: 85 (in part); Takeuchi, 1952: 18; Abe and Togashi, 1989: 555; Togashi, 1997 a: 3; Togashi, 2002 a: 9. Not Cameron (1876). Siobla pacifica: Takeuchi, 1936: 86 (in part). Not Smith (1874). Siobla jucunda: Taeger et al., 2010: 583; Niu & Wei, 2010: 50. Distribution. Japan (Hokkaido, southern Kuriles, Honshu, Shikoku), Russia (Primorskiy kray; Sakhalin). New records for Japan and Sakhalin. Primary type examined. Lectotype of Encarsioneura jucunda hereby designated (Fig. 4 d–f): ♂, “Ussuri, Kasakewitsch, 1907, Korb” “ Encarsioneura jucunda det. Mocs.” “ Encarsioneura jucunda Mocs.” “DEI-GISHym 1003 ” (HMNH). Other material examined (see Appendix). 614 specimens (213 ♀ and 401 ♂). Variation. The length varies from 10.5 to 15.0 mm in the female and 9.0 to 12.5 mm in the male. This species shows some variation in colouration. In the female, the black areas on the basal three antennomeres may be reduced but are always present. The hind femur is always entirely black. The abdomen sometimes has only the tergum 2 brown. In the male, the basal three antennomeres (except for apex of the third) are usually black, but sometimes the base of antennomere 4 is also marked with black. Normally, abdominal terga 2 to 4 and the base of 5 are reddish brown, but in very dark specimens, only terga 2 and 3 are partly marked with reddish brown. The ranges of some ratio variations are given in the key. Remarks. Among the Japanese congeners, this species is recognized by the entirely black head and thorax, the pale brown antenna, with the scape, ...