Siobla ruficornis ( Gimmerthal, 1834 )

Niu, Gengyun & Wei, Meicai, 2021, Review of some Siobla (Hymenoptera: Tenthredinidae) species, Zoological Systematics 46 (3), pp. 208-224 : 209-210

Siobla ruficornis ( Gimmerthal, 1834) ( Figs1–3 )

Allantus ruficornis Gimmerthal, 1834: 125 .

Eriocampa ruficornis Cameron, 1876: 462 .

Siobla ruficornis var. albicornis Malaise, 1931: 121 .

Siobla sibirica var. bergmani Malaise, 1931: 122 .

Encarsioneura similis Mocsáry, 1909: 14–15 . Type locality: Sibiria orientalis: Ussuri. syn. nov.

Diagnosis. Only two species of Siobla are distributed in Europe, S. ruficornis and S. sturmii . The current species differs from the latter by the following: broad margin of clypeus and of pronotum reddish brown, microsculpures on the 2nd and 3rd abdominal tergites clear, hairs on dorsum of head pale brown, and slightly longer than the diameter of lateral ocellus. Within the genus, this species is similar to S. centralia , but differs from the latter by the following: the 2nd hind trochanter of both sexes black, the 7th to 9th abdominal tergites almost entirely black in female, at least the apical two tergites black in male; microsculptures clear in both sexes; sheath drastically narrow towards the apex.

Distribution. China (Heilongjiang (Yichun), Jilin (Mt. Changbai), Qinghai (Huzhu), Hebei), Russia, Finland, Latvia.

Primary type examined. 1♀, lectotype (HNHM, here designated): “Ussuri, Kasakewiisch, 1907, Koro”; “ Encarsioneura similis , det. Mocsáry” [red label]; “ Lectotype, Encarsioneura similis Mocsáry, 1909 , Des. Niu G, 2010”; “DEI-GISHym 1001”; “ Siobla ruficornis ( Gimmerthal, 1834) , Det. Niu G, 2010”. 1♀, paralectotype (HNHM, here designated): “Ussuri, Kasakewiisch, 1907, Koro”; “ Encarsioneura similis , det. Mocsáry” [red label]; “ Paralectotype, Encarsioneura similis Mocsáry, 1909 , Des. Niu G, 2010”; “DEI-GISHym 1002”; “ Siobla ruficornis ( Gimmerthal, 1834) , Det. Niu G, 2010”.

Remarks. The types of Encarsioneura similis Mocsáry were carefully compared with specimens of Siobla ruficornis Gimmerthal (type missing). No distinct difference was found between Encarsioneura similis and S. ruficornis . The former is treated as a junior synonym of the latter here. The record of S. ruficornis from South Korea ( Lee et al., 2000) is a misidentification of S. jucunda ( Mocsáry, 1909) and Siobla sturmii (Klug, 1817) .

Figures

Figure 1. Siobla ruficornis (Gimmerthal, 1834). a–c. Lectotype of Encarsioneura similis Mocsáry, 1909, ♀. a. Dorsal view; b. Lateral view; c. Labels. d–e. Paralectotype of E. similis Mocsáry, 1909, ♂. d. Dorsal view. e. Labels. Scale bars=1mm.

Figure 2. Siobla ruficornis (Gimmerthal, 1834), head, same specimens as Figure 1. a–b. Dorsal view. c–d. Frontal view. e–f. Antenna. a, c, e. Lectotype of Encarsioneura similis Mocsáry, 1909, ♀. b, d, f. Paralectotype of E. similis Mocsáry, 1909, ♂. Scale bars=1mm.

Figure 3. Siobla ruficornis (Gimmerthal, 1834), thorax (same specimens as in Fig. 1). a–b. Lateral view. c–d. Dorsal view. a, c. Lectotype of Encarsioneura similis Mocsáry, 1909, ♀. b, d. Paralectotype of E. similis Mocsáry, 1909, ♂. Scale bars=1mm.