Ancistrocerus raddei (Kostylev, 1940)

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

Ancistrocerus raddei (Kostylev, 1940)

Figures 1-3 , 4-5 , 10 , 11 , 16

Material examined.

Russia: Altai Rep., Kosh-Agach Distr., 6-8 km NE Kokorya, Kyzylshin Riv. vall., 49°57.34'N, 89°03.56'E, 1900 m, 17.VII.1996, (1 ♂), leg. A. Dudko, R. Dudko [FSCV]; Kosh-Agach Distr. , 5 km SE Chagan-Uzun , Tydtuyaryk Riv. vall., 50°04.42'N, 88°25.20'E, 8.VII.2019, (1 ♂), leg. AF [CAFK] ; ibid., 9.VII.2019, (2 ♀, 4 ♂), leg. Yu.N. Danilov [CAFK] ; ibid., 9.VII.2019, (1 ♀, 2 ♂), leg. AF [CAFK] ; ibid., 10.VII.2019, (1 ♀), leg. AF [CAFK] .

Distribution.

Russia: Western Siberia (Altai), Eastern Siberia (Krasnoyarsk Terr., Zabaikalskiy Terr.). - Mongolia, China.

Remarks.

Two males of this species from Krasnoyarsk Territory and Altai Republic were previously misidentified as another similar species, i. e., Ancistrocerus dusmetiolus (Strand, 1914) ( Fateryga 2017, Fateryga et al. 2017), while two females from Altai Republic and Zabaikalskiy Territory were reported as A. raddei ( Fateryga et al. 2017). The present record of both females and males in the same habitat in Altai suggested that the previous reports were based on a single species, i. e., only one species of this pair occurs in Siberia and Russia as a whole. Study of the holotype of A. raddei in ZISP (Figs 1-3 ) confirms that the Russian material belongs to this species. Females of A. raddei (Figs 4 , 5 ) appear larger than A. dusmetiolus (Figs 6 , 7 ) and have a different color pattern: the clypeus is often mostly yellow with a central black spot but can be black with lateral yellow spots on its basal part as well; the dorsal mesepisternum often bears a large yellow spot and the scutellum always has two lateral yellow spots, as well as sometimes also the metanotum and propodeum; yellow apical bands on the metasoma are usually present on T1-T4 and S2 (rarely on T1-T5 or T1-T3 only; sometimes also on S3 but in some specimens all the sterna are black as well). Females of A. dusmetiolus from the type locality ( “Rivas”, Spain) have clypeus always black with lateral yellow spots on its basal part; their dorsal mesepisternum, scutellum (with very rare exceptions), metanotum, and propodeum are completely black; yellow apical bands on the metasoma are usually present on T1-T5 and S2-S4. Females from Central Asia (Figs 8 , 9 ), corresponding to the diagnosis of Odynerus (Ancistrocerus) alius Kostylev, 1935, junior subjective synonym of A. dusmetiolus according to Blüthgen (1939), generally resemble those from Spain but they usually have an additional spot on T6 and an apical band on S5. At the same time, males of A. raddei from Russia and A. dusmetiolus from both Spain and Central Asia have a similar color pattern (Figs 10 , 12 , 14 ); only the number of apical bands on the metasoma slightly varies (4-6 on terga and 3-5 on sterna) between the species and two small lateral yellow spots on the scutellum can be sometimes present in A. raddei , while they are always absent in A. dusmetiolus . There are no valuable differences between them in the structure; in particular, even the shape of the clypeus is very similar (Figs 11 , 13 , 15 ). Their genitalia, particularly aedeagi, also have no significant differences (Figs 16-18 ). Thus, the taxonomic status of A. raddei is unclear: it may represent either just a color form of A. dusmetiolus or a distinct allopatric species. To ascertain the relationships between A. raddei and both the European and Central Asian populations of A. dusmetiolus , all of them should be studied molecularly. Until this is done, A. dusmetiolus should be excluded from the fauna of Russia.

Figures

Figures 1 - 3. Odynerus (Ancistrocerus) raddei Kostylev, 1940, holotype, female (ZISP) 1 lateral habitus 2 head in frontal view 3 labels. Scale bars 1.0 mm.

Figures 4 - 9. Ancistrocerus raddei (Kostylev, 1940), Russia (Altai) (4, 5), A. dusmetiolus (Strand, 1914), Spain (6, 7), and A. dusmetiolus, Uzbekistan (" Odynerus alius Kostylev, 1935 ") (8, 9), females 4, 6, 8 dorsal habitus 5, 7, 9 head in frontal view. Scale bars 1.0 mm.

Figures 10 - 15. Ancistrocerus raddei (Kostylev, 1940), Russia (Altai) (10, 11), A. dusmetiolus (Strand, 1914), Spain (12, 13), and A. dusmetiolus, Uzbekistan (" Odynerus alius Kostylev, 1935 ") (14, 15), males 10, 12, 14 dorsal habitus 11, 13, 15 head in frontal view. Scale bars 1.0 mm.

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.