Euura dahlbomi ( Thomson, 1871 )

Liston, Andrew, Vikberg, Veli, Mutanen, Marko, Nyman, Tommi & Prous, Marko, 2023, Palaearctic willow-catkin sawflies: a revision of the amentorum species group of Euura (Hymenoptera, Tenthredinidae), Zootaxa 5323 (3), pp. 349-395 : 365

publication ID

https://doi.org/ 10.11646/zootaxa.5323.3.2

publication LSID

lsid:zoobank.org:pub:BF09BB2F-150C-46D6-B9D2-D27163CA1A28

DOI

https://doi.org/10.5281/zenodo.8225913

persistent identifier

https://treatment.plazi.org/id/6674502F-5000-575D-27BE-EAD3BEF63547

treatment provided by

Plazi

scientific name

Euura dahlbomi ( Thomson, 1871 )
status

 

Euura dahlbomi ( Thomson, 1871)

Figures 5 View FIGURE 5 , 17 View FIGURE 17 , 18C View FIGURE 18

Nematus dahlbomi Thomson, 1871: 134–135 . Described: syntypes, ♀. Published type locality: Lappland. Lectotype (examined)

designation by Lindqvist (1954). Amauronematus dahlbomi: Konow, 1890 . Nematus dahlbomii: de Dalla Torre, 1894 ; misspelling. Pontopristia dahlbomi: Lindqvist, 1961 . Nematus (Pontopristia) dahlbomi: Zhelohovcev, 1988 . Amauronematus (Pontopristia) dahlbomi: Liston, 1995 . Euura dahlbomi: Goulet & Bennett, 2021 . Pontopristia lapponica Malaise, 1921: 14 . Described: syntypes, 8♀, 2♁. Published type locality [as comment under P. romani ,

p. 14]: Vassijaure , Lappland [ Sweden, Vassijaure]. Lectotype designated below. Synonymy with suavis var. fusca by Conde

(1938). Synonymy with dahlbomi by Lindqvist (1961). Pontopristia suavis var. fusca Malaise, 1921: 12–13 . Described: syntypes, 7♀, 2♁ (?NHRS, not located). Published type locality:

Vassijaure, Lapland [ Sweden, Vassijaure]. Synonymy with N. dahlbomi by Lindqvist (1954).

Diagnosis. Female: The lancet of this species is highly distinctive, with marginal serrulae developed only on the first and second annuli and the apical half of the lamnium, and some ctenidia visible on the basal annular sutures ( Fig. 17A–B View FIGURE 17 ).

Male: So far, this is the only amentorum group male, apart from that of E. amentorum , with a pale fore wing costa and stigma ( Fig. 5G View FIGURE 5 ). The male of E. amentorum differs in its very long extension of pseudoceps ( Fig. 18A View FIGURE 18 ), and paler colouration of head and body ( Fig. 3E–F View FIGURE 3 ). The penis valve strongly resembles those of E. freyja ( Fig. 18 E–F View FIGURE 18 ) and E. microphyes ( Fig. 18D View FIGURE 18 ), but E. dahlbomi has edge of paravalva below the valvispina less strongly downward-deflected.

Description. Female ( Fig. 5A View FIGURE 5 ). Length 3.5–4.0 mm. Black. Pale are more or less mandibles, palps, labrum, tibiae, apices of femora. Cerci pale. Wing veins including fore wing pterostigma pale.

Head ( Fig. 5B View FIGURE 5 ). In dorsal view moderately contracted behind eyes, and length posterior of eye about 0.50–0.60 × length of eye. Mostly dull with coriaceous sculpture except for labrum. Upper head densely setose; setae pale, about 0.7 × as long as anterior ocellus diameter. Clypeus slightly emarginate medially. Labrum apically rounded. Antenna 0.94–1.0 × as long as fore wing costa.

Thorax. Pronotum, mesoscutum and tegula densely punctate with small shiny interspaces; vestiture similar to upper head, adpressed. Lateral mesoscutal lobe approximately 1.60 × as long as greatest width. Mesoscutellum as broad as long, without longitudinal median furrow; with few, extremely weak punctures; smooth and shiny. Upper half of mesepisternum usually smooth, shiny ( Fig. 5C View FIGURE 5 ); with small ventral glabrous patch; setae about 0.5 × as long as diameter of anterior ocellus.

Abdomen. Valvulae 3 in lateral view ( Fig. 5F View FIGURE 5 ) clearly orientated upwards; tapering to the narrowly rounded tip. In dorsal view ( Fig. 5E View FIGURE 5 ) subparallel-sided, gently widened before tip, 1.0–1.1 × as wide as narrowest distal width of metatibia. Cercus reaches approximately to the tip of valvulae 3. Lancet ( Fig. 17A–B View FIGURE 17 ): 16–19 annular sutures; strongly curved (lower edge concave); approximately basal half of lamnium without marginal serrulae, distal half with rather flat serrulae; basal annular sutures with ctenidial teeth; a lobe present at anterior of tangium.

Male [based on 4 specimens]. Length 3.7 mm. As female, except: Antenna 1.2–1.3 × as long as fore wing costa. Abdomen black except for pale cerci, and more or less sternum 9. Tergum 8: tergal hollows narrow, fully sclerotised. Procidentia subrectangular, projecting clearly beyond posterior tergal edge by slightly less than its distal width, becoming a narrow carina (without the sculpture of the adjacent areas) towards anterior. Penis valve ( Fig. 18C View FIGURE 18 ): Valvispina short, basally narrow; edge of paravalva below the valvispina only slightly downward-deflected; lobe on paravalva below valvispina small or absent.

Variability. Upper half of mesepisternum sometimes with coriaceous sculpture, dull ( Fig. 5D View FIGURE 5 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Tenthredinidae

Genus

Euura

Loc

Euura dahlbomi ( Thomson, 1871 )

Liston, Andrew, Vikberg, Veli, Mutanen, Marko, Nyman, Tommi & Prous, Marko 2023
2023
Loc

Nematus dahlbomi

Thomson, C. G. 1871: 135
1871
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF