Dolerus gessneri Andre , 1880

Liston, Andrew, Mutanen, Marko, Heidemaa, Mikk, Blank, Stephan M., Kiljunen, Niina, Taeger, Andreas, Viitasaari, Matti, Vikberg, Veli, Wutke, Saskia & Prous, Marko, 2022, Taxonomy and nomenclature of some Fennoscandian Sawflies, with descriptions of two new species (Hymenoptera, Symphyta), Deutsche Entomologische Zeitschrift 69 (2), pp. 151-218 : 151

Dolerus gessneri Andre, 1880

Fig. 19

Notes.

Dolerus Gessneri [sic!] André, 1880: 273. Sex not given. Syntypes. Type locality: Switzerland. Lectotype ♀ hereby designated, labelled: “Suisse”, "DEI GISHym 89367" [printed], "coll. Desbrochers [handwritten] k. [kollektsija = coll.] A. Jakovleva [nomin. A. Jakovlev]" [printed], "SYNTYPUS [printed in red] Dolerus gessneri ANDRÉ, 1880 [handwritten] teste A. Taeger 20[printed]18 [handwritten]" [white with a red frame]. "Lectotype Dolerus gessneri André 1880 vide A. Taeger 2022 des." [red, printed]. Good condition, but slightly dusty. Paralectotypes: 2♂ (one without flagella) with the same data (except “♂” [printed], "DEI-GISHym 89365" and “D… 89366" and " Paralectotypus " instead of " Lectotypus "). All in ZIN.

The color form of Dolerus gessneri with a red-banded abdomen was described as a distinct species, D. labiosus Konow, 1897 ( Konow 1897b), but was later mostly treated as a synonym (sometimes also as a subspecies) of D. gessneri , because intermediate color forms with variable red markings on the abdomen occur. The specimens from the Russian Far East with completely black forelegs, which have sometimes been determined as D. gessneri , probably belong to some other Dolerus (subgen. Equidolerus) species. Dolerus gessneri , a Holarctic species, needs a revision, because COI barcoding data suggest that it could include more than one species, and some morphological characters correlate with the genetic data. There are three BIN clusters (BOLD:AAL2317, BOLD:ACE7304, BOLD:ACE3617) diverging by 1.8-2.3%. BOLD:AAL2317 is closest to D. timidus and BOLD:ACE7304 is closest to D. pratensis (minimum divergence in both cases 1.2%). All three BIN clusters are represented in Fennoscandia, two of which (Fig. 19 ) have been found in Finland.

Figures

Figure 19. Dolerus gessneri (Andre, 1880) (ZMUO. 045118). A. Dorsal habitus; B. Lateral habitus. Dolerus sp. near gessneri (ZMUO. 045279); C. Dorsal habitus; D. Lateral habitus.