Pseudodineura enslini ( Hering, 1923 )

Liston, Andrew, Prous, Marko & Vårdal, Hege, 2019, The West Palaearctic Pseudodineura and Endophytus species (Hymenoptera, Tenthredinidae), Zootaxa 4614 (3), pp. 511-528 : 519-520

Pseudodineura enslini ( Hering, 1923)

Pelmatopus enslini Hering, 1923: 194–197 . Syntypes ♀ ♂. Lectotype ♀ (GBIF-GISHym2802; images: https://doi.org/10.6084/ m9.figshare.7880810) in ZMHB, here designated. Type locality: Botanischen Garten , Berlin-Dahlem [ Germany] . Paralectotypes: see Specimens examined .

Pseudodineura enslini: Hering 1937: 536 .

Notes: Hering (1923) selected one male and one female each as “Typus” and referred to the remaining specimens as “ Paratypen ”. The type series therefore comprised syntypes. The lectotype designation agrees with Hering’s intention.

Additional description. Body length: ♀ 3.0– 4.5mm, ♂ 4.5mm. Female: pronotum completely black, to paleedged posteriorly. Tegulae black to brown. Abdomen black except more or less for valvula 3. Lancet: Fig. 30. Male: pronotum and tegulae black. Sternum 9 black, apically more or less pale. Penis valve: Fig. 21 .

Total number of specimens examined: 31♀, 16♂.

Similar species. The sawsheath of enslini and its setation is closest to clematidisrectae , but the females of the latter differ in their prodominantly black femora (entirely pale in clematidisrectae ). The lancet of enslini (Fig. 30) has smaller and proportionately somewhat narrower sawteeth than clematidisrectae (Fig. 28). Possibly there are differences in the shape of the tangium and the distribution of campaniform sensilla (“pores”), but this needs checking in a greater number of specimens. Externally, the male of enslini closely resembles the other two species with black-marked femora ( fuscula and parvula ), but is readily distinguished by its penis valve (see key).

Life history. Host plants: Trollius species; in Europe on T. europaeus in semi-natural / natural vegetation ( Altenhofer & Pschorn-Walcher 2006), and several other non-native species in parks and gardens ( Buhr 1941), including T. hybridus hort. in Sweden ( Wahlgren 1951).

Distribution. Central and northern Europe, including the British mainland ( Taeger et al. 2006), and eastern Siberia ( Sundukov 2017). Frequently occurs on cultivated Trollius in gardens, as was the case for the type series. Occurrence in Sweden: published records; Skåne ( Wahlgren 1944, 1951), Västergötland ( Wahlgren 1963). Material examined: Småland, Dalarna, Torne Lappmark. Altenhofer & Pschorn-Walcher (2006) noted that enslini has been found in the Alps only at altitudes up to 1600m, i.e. within the subalpine zone. Our observations of mines at two localities above the tree-line in the Torne Träsk area, at approx. 700 and 900m above sea level, make an interesting comparison.

Specimens examined. Paralectotypes: all with the same data: Berlin-Dahlem, rearing no. 1742, Trollius europaeus , various emergence dates in 1922. 1♀ (GBIF-GISHym2803) 1♂ (GBIF-GISHym2801) in ZMHUB, 1♀ 1♂ (GBIF-GISHym3890) in SDEI, 4♀ (GBIF-GISHym3476–3478, 3482) 2♂ in ZSM, 2♀ 1♂ in NHRS. Not exam- ined: 1♀ 1♂ in MSNG ( Zombori 1985) .

Other material: Austria: 13♀, 10♂, reared from Trollius europaeus (SDEI). Including: 1♀ (DEI-GISHym19535), Lower Austria, Allentsteig, 27.06.1991, emerged 13.05.1992, leg. E. Altenhofer (SDEI). 1♀ (DEI-GISHym15348), same collection data as preceding (SDEI). 1♂ (DEI-GISHym15347), same locality as preceding, but coll. 17.06.1991 (SDEI). Salzburg: leaf-mine with larva (DEI-GISHym17050), Tappenkarsee, 1500–1750m, 47.18°N 13.32°E, 23.07.2010, leg. Liston & Taeger(SDEI). 1♀ (DEI-GISHym31816), locality unknown, reared Ranunculus aconitifolius [misidentification of Trollius ], leg. E. Altenhofer (SDEI).

Germany: 5♀, two reared from Trollius europaeus ( SDEI) .

Latvia: 1♀, 1♂, reared from Trollius europaeus ( SDEI) .

Russia: 1♀, Siberia, Irkutsk, Coll. Konow (SDEI) [ Pelmatopus parvulus det. Enslin, Pseud. fuscula det Morice]

Scotland: 1♂, reared from Trollius europaeus ( SDEI) .

Sweden: Småland : 1♀, Jönköping, 57.78°N 14.18°E, 25.05.1927, leg. Wieslander (NHRS-HEVA000003432), previously determined as P. clematidisrectae ( NHRS) . Dalarna: 1 large leaf-mine, Trollius europaeus, Stenis 1km N, 60.95°N 14.47°E, 15.06.2013, leg. Liston, Prous & Taeger ( SDEI) . Torne Lappmark : 5 young leaf-mines, Trollius europaeus, Björkliden , 500–600m, 68.41°N 18.64°E, 09.07.2016, leg. Liston & Prous ( SDEI) . 3 young leaf-mines, Trollius europaeus, Abisko, Mt Njulla , above tree-line, ca. 900m, 68.36°N 18.73°E, 29.07.2017, leg. Liston & Prous ( SDEI) . 5 young leaf-mines, Trollius europaeus, Abisko, Abisko River , ca. 380m, 68.36°N 18.77°E, 2.8.2017, leg. Liston & Prous ( SDEI) .

Figures

FIGURES 21–26. Pseudodineura species, penis valves; 21, enslini (15347) vl = ventroapical lobe. 22, parvula (31894) df = distal filament. 23, fuscula (31891). 24, clematidisrectae (31889). 25, clematidis (31843). 26, mentiens (31893).