Stenodynerus rossicus Fateryga & Kochetkov, 2020

Fateryga, Alexander V., Proshchalykin, Maxim Yu., Kochetkov, Denis N. & Buyanjargal, Batchuluun, 2020, New records of eumenine wasps (Hymenoptera, Vespidae, Eumeninae) from Russia, with description of a new species of Stenodynerus de Saussure, 1863, Journal of Hymenoptera Research 79, pp. 89-109 : 89

Stenodynerus rossicus Fateryga & Kochetkov sp. nov.

Figures 19 , 27-34

Material examined.

Holotype: ♀, Russia: Amurskaya Prov. , “Хинганский зап., Хинганское л-во, р. Тарманчукан, Понаб” [Arkhara Distr., Khingan Nature Reserve, Khingan Forestry, Tarmanchukan Riv., Ponab Natural Landmark], 18-19.VI.2015, leg. D.N. Kochetkov [ZISP] (dry pinned specimen, illustrated in Figs 27-30 ) . Paratypes: Russia: Altai Rep. , 2 ♀, Kosh-Agach Distr., 24 km NWW Aktash, Chuya Riv. vall., 50°21.52'N, 87°16.25'E, 6.VII.2019, leg. A.V. Fateryga [CAFK]. Amurskaya Prov ., 2 ♀, “п. Архара, скалистый холм, лесная дорога” [Arkhara Distr., Arkhara , rocky hill, forest road], 14.VII.2013, leg. D.N. Kochetkov [FSCV] ; 1 ♀, 2 ♂, “п. Архара. Скалистый холм, суходольный луг” [Arkhara Distr., Arkhara. Rocky hill, upland meadow], 7-8.VI.2014, leg. D.N. Kochetkov [CAFK, FSCV] ; 1 ♀, ibid., 14.VI.2014, leg. D.N. Kochetkov [FSCV] ; 2 ♀, ibid., 27.VI.2014, leg. D.N. Kochetkov [FSCV] ; 2 ♀, “п. Архара, скалистый холм, осыпь, суходольный луг” [Arkhara Distr., Arkhara , rocky hill, scree, upland meadow], 14.VI.2015, leg. D.N. Kochetkov [FSCV] ; 1 ♀, ibid., 26.VI.2015, leg. D.N. Kochetkov [CAFK] ; 1 ♀, “Хинганский зап., пос. Архара, суходольный луг на склоне” [Arkhara Distr., Khingan Nature Reserve, Arkhara , upland meadow on a slope], 12.VII.2016, leg. D.N. Kochetkov [CAFK] ; 1 ♀, 1 ♂ (illustrated in Figs 31-34 ), “пос. Архара, ур. Архаринский увал, суходольный луг на склоне” [Arkhara Distr., Arkhara, Arkharinskiy Uval Natural Landmark, upland meadow on a slope], 22.VI.2018, leg. D.N. Kochetkov [FSCV, ZISP] ; 1 ♀, ibid., 10.VII.2019, leg. D.N. Kochetkov [FSCV] ; 2 ♀, ibid., 27.VII.2019, leg. D.N. Kochetkov [FSCV] ; 1 ♀, “Хинганский заповед., хр. Мал. Хинган, 3 км В Урила, р. Тарманчукан” [Arkhara Distr., Khingan Nature Reserve, Malyi Khingan Range , 3 km E Uril, Tarmanchukan Riv.], 10-12.VII.2018, leg. D.N. Kochetkov [FSCV] .

Diagnosis.

The new species is closely related to S. punctifrons (Thomson, 1874) but differs by having a more slender habitus, black scapus and dorsal mesepisternum in the female, black or dark brown tarsi in the female, and a less deeply emarginated apical margin of clypeus in the male [in S. punctifrons (Figs 35-39 ), the female scapus is reddish or orange ventrally and the dorsal mesepisternum bears a yellow spot, the female tarsi are ferruginous, the male clypeus has a deeply emarginated apical margin]. Another closely related species is S. picticrus (Figs 40-44 ), whose habitus, female color pattern, and male clypeus are similar to those of S. rossicus sp. nov. but which has a flattened scutellum and distinctly longer T1 in dorsal view [both in S. rossicus sp. nov. and S. punctifrons , the scutellum is evidently convex and T1 is remarkably shorter than long in dorsal view]. The new species is also similar to S. pullus (Figs 45-49 ) and S. orenburgensis (Figs 50-54 ) but the two latter species have unnoticeable pilosity on the scutum (the setae are much shorter than the diameter of a lateral ocellus versus ± equal to the diameter of a lateral ocellus in S. rossicus sp. nov., S. punctifrons , and S. picticrus ), and a female color pattern similar to that in S. punctifrons ; the male clypeus has a deeply emarginated apical margin in S. orenburgensis , less deeply in S. pullus . The male F11 of S. rossicus sp. nov. is rather big (0.8 as long as F9), similar to that in S. orenburgensis , while it is slightly smaller in S. punctifrons and S. picticrus (0.7 as long as F9) and very small in S. pullus (0.5 as long as F9). The aedeagus of S. rossicus sp. nov. (Fig. 19 ) is strongly widened towards the base, similar to that in S. punctifrons (Fig. 20 ) and S. picticrus (Fig. 21 ) but in a somewhat different manner, while it is less widened towards the base in S. pullus (Fig. 22 ) and almost parallel-sided in S. orenburgensis (Fig. 23 ). The apex of the aedeagus of S. rossicus sp. nov. is very slightly emarginated as in S. orenburgensis , while it is rounded in S. punctifrons , S. picticrus , and S. pullus .

Description.

Female. Body length (from head to apical margin of T2) 8 mm; fore wing length 6.5 mm. Structure: Head 1.1 × as wide as long in frontal view. Clypeus as wide as long; its apical emargination up to 0.3 × as deep as wide, taking 1/4 of clypeal width. Vertex longer than upper portion of compound eye, ± flat; cephalic fovea weakly developed, slightly narrower than distance between lateral ocelli. Anterior face of pronotum with V-shaped pair of median foveae; pronotal carina obsolete at center (between yellow spots) and distinct laterally, forming blunt angles at anterolateral corners of pronotum. Epicnemial carina weakly developed but distinct. Tegula evenly rounded posterolaterally. Scutellum slightly but evidently convex. Metanotum dorsally slightly impressed at center. Propodeal shelf weakly developed. Propodeal valvula bilamellate; upper lobe nearly rectangular in lateral view. T1 1.7 × as wide as long in dorsal view, rounded in lateral view, without transverse carina. T2 uniformly convex through entire length, without apical lamella. S2 uniformly convex in lateral view; basal longitudinal furrow on S2 obsolete. Punctation: Clypeus ± densely punctured and longitudinally strigate, especially at center; interstices reach approximately 2 puncture diameters, shining but with rather deep micropunctures. Frons with denser and larger punctures than those on clypeus; interstices less than puncture diameter, matt, with micropunctures similar to those on clypeus. Punctation on vertex and temples similar to that on frons but sparser; interstices approximately equal to puncture diameter. Dorsal and lateral parts of pronotum, scutum, and scutellum with deep large punctures, ± equal in diameter to parategula width at apex; interstices matt, less than puncture diameter, with distinct micropunctures. Dorsal and ventral mesepisterna and mesepimeron with somewhat smaller and sparser punctures than those on scutum; interstices reach puncture diameter, shining, with rather shallow micropunctures. Tegula with micropunctures only. Dorsal (yellow) face of metanotum with approximately 10 punctures; interstices exceed puncture diameter, shining. Posterior (black) face of metanotum with rough sculpture, matt. Dorsolateral parts of propodeum with comb-like sculpture. Metapleura, lateral parts of propodeum, and propodeal concavity strigate, matt. T1 with dense punctures similar in size to those on scutum but shallower; interstices less than puncture diameter; both punctures and interstices with dense shallow microsculpture. T2-T5 with sparser and smaller punctures than those on T1; interstices approximately equal to puncture diameter, with microsculpture similar to that on T1. T6 with dense shallow microsculpture, without distinct punctures. Punctation on S2 similar to that on T2 but sparser and deeper; interstices reach approximately 3 puncture diameters; distinct microsculpture well visible on them. Punctation on S3-S6 similar to that on corresponding terga. Pilosity: Mandibles with straight pale setae, as long as width of first labial palpomere at posterior end. Clypeus and temples with ± appressed brownish setae, somewhat shorter than those on mandibles. Frons and vertex with straight brownish setae, as long as scapus width at base. Dorsal mesosoma with similar but shorter setae, as long as diameter of lateral ocellus. Remaining parts of mesosoma, legs except tibiae and tarsi, and metasoma with setae similar to those on clypeus and gena. Tibiae and tarsi with similar but thicker and straighter setae. Color: Black. Following parts yellow: spot on frons; two small spots on temples at dorsolateral corners of head; two small spots on dorsal face of pronotum (absent in one specimen); dorsal face of metanotum; apical bands on T1 and T2; narrow apical band on S2. Tegula ferruginous. Apical 5-10% of femora and entire tibiae from dark brown to ferruginous. Tarsi from black to dark brown. Wings strongly fuscous, particularly on median, first submarginal, and marginal cells.

Male. Body length (from head to apical margin of T2) 7 mm; fore wing length 6 mm. Structure: Resembles female but clypeus 1.2 × as wide as long; its apical emargination up to 0.5 × as deep as wide, taking slightly more than 1/4 of clypeal width. Vertex about as long as upper portion of compound eye, flat. Apex of F11 reaches posterior margin of F8. Meso- and metasoma as in female. Aedeagus as in Fig. 19 . Punctation: Resembles female but clypeus not strigate. Punctation on dorsal and lateral parts of pronotum, scutum, and scutellum sparser than that in female; interstices approximately equal to puncture diameter. Pilosity: Resembles female but clypeus appears bare, with just very minute setae. Color: Black. Following parts yellow: mandibles, labrum, clypeus, spot on frons; two small spots on temples at dorsolateral corners of head; scapus frontally; two large spots on dorsal face of pronotum; dorsal face of metanotum; spots on fore and middle (or only middle) coxae; posterior 1/3 of front femora ventrally; posterior 2/3 of middle femora ventrally; entire tibiae and basitarsi; apical bands on T1, T2, and S2. Tegula, flagellum ventrally, and tarsi 2-5 ferruginous. Wings strongly fuscous as in female.

Etymology.

The specific name " Stenodynerus rossicus " is an adjective in the nominative singular that means “Russian” in Latin and refers to the occurrence of this species in Russia.

Distribution.

Russia: Western Siberia (Altai), Far East (Amurskaya Prov.).

Figures

Figures 16 - 23. Aedeagi in dorsal view 16 Ancistrocerus raddei (Kostylev, 1940), Russia (Altai) 17 A. dusmetiolus (Strand, 1914), Spain 18 A. dusmetiolus, Uzbekistan (" Odynerus alius Kostylev, 1935 ") 19 Stenodynerus rossicus Fateryga & Kochetkov, sp. nov., paratype, Russia (Amurskaya Prov.) 20 S. punctifrons (Thomson, 1874), Russia (Amurskaya Prov.) 21 S. picticrus (Thomson, 1874), Russia (Primorskiy Terr.) 22 S. pullus Gusenleitner, 1981, Russia (Tyva Rep.) 23 S. orenburgensis (Andre, 1884), Russia (Khakassia). Scale bar 0.5 mm.

Figures 27 - 34. Stenodynerus rossicus Fateryga & Kochetkov, sp. nov., Russia (Amurskaya Prov.), holotype, female (27 - 30) and paratype, male (31 - 34) 27, 31 dorsal habitus 28, 32 lateral habitus 29, 33 head in frontal view 30 labels 34 apex of antenna. Scale bars 0.5 mm.

Figures 35 - 44. Stenodynerus punctifrons (Thomson, 1874), female, Russia (Amurskaya Prov.) (35, 36), S. punctifrons, male, Russia (Amurskaya Prov.) (37 - 39), S. picticrus (Thomson, 1874), female, Russia (Krasnoyarsk Terr.) (40, 41), and S. picticrus, male, Russia (Amurskaya Prov.) (42 - 44) 35, 37, 40, 42 dorsal habitus 36, 38, 41, 43 head in frontal view 39, 44 apex of antenna. Scale bars 0.5 mm.

Figures 45 - 54. Stenodynerus pullus Gusenleitner, 1981, paratype, female, Russia (Primorskiy Terr.) (45 - 46), S. pullus, male, Russia (Primorskiy Terr.) (47 - 49), S. orenburgensis (Andre, 1884), female, Russia (Crimea) (50, 51), and S. orenburgensis, male, Russia (Crimea) (52 - 54) 45, 47, 50, 52 dorsal habitus 46, 48, 51, 53 head in frontal view 49, 54 apex of antenna. Scale bars 0.5 mm.