Pristiphora frigida (Boheman, 1865)

Prous, Marko, Vikberg, Veli, Liston, Andrew & Kramp, Katja, 2016, North-Western Palaearctic species of the Pristiphora ruficornis group (Hymenoptera, Tenthredinidae), Journal of Hymenoptera Research 51, pp. 1-54 : 23-24

Pristiphora frigida (Boheman, 1865)

Nematus frigidus Boheman, 1865: 568-569. Lectotype ♂ (NHRS-HEVA000005005; here designated) in NHRS, examined. Type locality: "Middel Hook in Belsund" (Spitsbergen Island), Svalbard, Norway.

Pristiphora Adelungi [sic!] Konow, 1902: 162, 167-168. Lectotype ♀ (DEI-GISHym30151; here designated) in ZIN, examined. Type locality: Hornsund (Spitsbergen Island), Svalbard, Norway. Note. Additional male specimen of P. adelungi labelled as “TYPE” is deposited in SDEI. Since this specimen lacks labels with detailed information given in the original description, its type status remains uncertain.

Similar species.

Externally, perhaps the most similar species is P. bifida , from which it can be distinguished by having black or brown hind trochanters, trochantelli, and tibiae (pale in P. bifida ). In addition, antennae of males have only some barely visible stout black setae among finer paler ones (Fig. 35 ), while these are numerous and clearly visible in P. bifida (Fig. 36 ). On the other hand, the penis valve (Fig. 88 ) might indicate a closer relationship to P. melanocarpa and P. ruficornis (Figs 79-82 ), because of a membranous fold near the tip of the ventro-apical spine that is missing in other species of Pristiphora ruficornis group. The tangium of the lancet (Fig. 71 ) also resembles more closely the Betula feeding P. melanocarpa and P. ruficornis (Figs 46 - 53 ) rather than P. bifida (Fig. 70 ): the dark sclerotized area is rather broader than long instead of longer than broad.

Genetic data.

No data.

Host plants.

Unknown.

Distribution and material examined.

Western Palaearctic. Specimens studied are from Norway ( Svalbard).

Figures

Figures 18 - 36. 18 P. albitibia DEI-GISHym 31514, thorax in lateral view 19 P. luteipes DEI-GISHym 80038, thorax in lateral view 20 P. astragali holotype, thorax in lateral view 21 P. leucopus DEI-GISHym 31556, lateral 22 P. leucopus DEI-GISHym 4989, lateral 23 P. luteipes DEI-GISHym 80038, lateral 24 P. luteipes DEI-GISHym 80038, flagellum 25 P. ruficornis DEI-GISHym 31185, flagellum 26 P. armata DEI-GISHym 11092 27 P. subopaca holotype, pterostigma (arrow) 28 P. opaca holotype, pterostigma (arrow) 29 P. ruficornis DEI-GISHym 31185, pterostigma (arrow) 30 P. appendiculata DEI-GISHym 31500, claw 31 P. opaca holotype, claw 32 P. subopaca holotype, claw 33 P. armata DEI-GISHym 11554, claw 34 P. bifida DEI-GISHym 31507, claw 35 P. frigida NHRS-HEVA 000005006, flagellum with barely visible stout black setae (arrows) 36 P. pusilla DEI-GISHym 80050, flagellum with clearly visible stout black setae.

Figures 87 - 96. Penis valves of Pristiphora ruficornis group. 87 P. bifida DEI-GISHym 80000 (arrow indicates a dorsal depression of the pseudoceps) 88 P. frigida NHRS-HEVA 000003861 (arrow indicates a membranous fold near the tip of the ventro-apical spine) 89 P. confusa DEI-GISHym 31265 90 P. confusa PR. 460 VV 91 P. subopaca DEI-GISHym 80030, left penis valve 92 P. subopaca paratype http: // id. luomus. fi / GL. 5203 93 P. pusilla DEI-GISHym 80029, left penis valve with strong dorsal depression of the pseudoceps (arrow) 94 P. pusilla DEI-GISHym 80029, right penis valve with weak dorsal depression of the pseudoceps 95 P. opaca PR. 459 VV 96 P. opaca http: // id. luomus. fi / GL. 5206, paratype of P. amaura Lindqvist.

Figures 77 - 86. Penis valves of Pristiphora ruficornis group. 77 P. appendiculata DEI-GISHym 31555 78 P. albitibia DEI-GISHym 20956 79 P. ruficornis PR. 462 VV 80 P. melanocarpa PR. 425 VV 81 P. ruficornis DEI-GISHym 19636 82 P. melanocarpa PR. 409 VV 83 P. armata PR. 465 VV 84 P. leucopus PR. 466 VV reared ex ovo from Tilia sp. 85 P. armata DEI-GISHym 80020 86 P. leucopus GBIF-GISHym 3246 (syntype of Nematus crassicornis Hartig).

Figures 70 - 72. Lancets of Pristiphora aphantoneura subgroup and P. frigida. 70 P. bifida PR. 408 VV 71 P. frigida NHRS-HEVA 000003873 72 P. pusilla PR. 369 VV.

Figures 46 - 49. Lancets of P. melanocarpa showing variation in the shape of the tangium. Some of the specimens have rather distinct small outgrowth between tangium and laminum (arrow in Fig. 49). 46 PR. 436 VV reared ex larva from Betula pubescens 47 PR. 423 VV reared ex larva from Betula pubescens 48 PR. 434 VV 49 PR. 431 VV, several larvae were reared ex ovo from this female ovipositing in the leaves of Betula nana.

Figures 50 - 53. Lancets of P. melanocarpa and P. ruficornis showing variation in the shape of the tangium. Lancets shown here clearly lack small outgrowth between tangium and laminum, which can be seen at least in Figs 48 - 49 50 P. melanocarpa PR. 440 VV 51 P. melanocarpa PR. 407 VV 52 P. ruficornis PR. 479 VV 53 P. melanocarpa PR. 723 VV reared ex larva from Betula pendula.