Pristiphora geniculata (Hartig, 1840)

Prous, Marko, Kramp, Katja & Liston 1, Veli VikbergAndrew, 2017, North-Western Palaearctic species of Pristiphora (Hymenoptera, Tenthredinidae), Journal of Hymenoptera Research 59, pp. 1-190 : 88

Pristiphora geniculata (Hartig, 1840) Figs 23, 150, 229

Nematus geniculatus Hartig, 1840: 26. Lectotype ♀ (GBIF-GISHym3290; here designated) in ZSM, examined. Type locality: not stated.

Nematus cheilon Zaddach, 1876: 41. Syntypes possibly destroyed ( Blank and Taeger 1998). Type locality: Danzig (Poland), Sonderburg (Denmark), Silesia (Central Europe) ( Brischke 1884). Synonymised with P. geniculata by Konow (1890).

Similar species.

The most similar species is P. pseudogeniculata . Both, females and males of P. pseudogeniculata have shorter antenna (1.9-2.1 times as long as head width compared to 2.4-2.5 in P. geniculata ) and a paler metatarsomere 1 (completely or nearly completely pale, compared to largely black in P. geniculata ). Lancets are also different (see the Key and Figs 150-151), but there appear to be no clear differences in penis valves (Figs 229-230).

Genetic data.

Based on COI barcode sequences, P. geniculata belongs to its own BIN cluster (BOLD:AAK9465) (Fig. 5). Maximum distance within the BIN is 0.18%. The nearest neighbour to BOLD:AAK9465, diverging by minimum of 7.02%, is BOLD:ACO1401 ( P. euxantha ). Even closer might be P. pseudogeniculata , but no sufficiently fresh specimens were available for sequencing. Based on nuclear data (two specimens and NaK), maximum within species divergence is 0.0% and the nearest neighbour is 0.7% different ( P. maesta ).

Host plants.

Sorbus aucuparia L. ( Forbes and Daviault 1964, Adam 1973, Pschorn-Walcher and Altenhofer 2000), S. americana Marshall ( Forbes and Daviault 1964), S. decora (Sarg.) C.K.Schneid. ( Forbes and Daviault 1964), × Sorbaronia hybrida (Moench) Schneider (an intergeneric hybrid between S. aucuparia and Aronia arbutifolia (L.) Pers.) ( Forbes and Daviault 1964).

Distribution and material examined.

Palaearctic, (Nearctic). Specimens studied are from Austria, Estonia, Finland, and Germany.