Dolerus coruscans Konow, 1890

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 coruscans Konow, 1890 sp. rev.

Fig. 17A-H

Dolerus varispinus sensu Konow, 1884: 351.

Dolerus coruscans Konow, 1890a: 10. Described by indication on the description of Dolerus varispinus sensu Konow, 1884 (above). ♀, ♂. Syntypes. Published type locality: not given. Lectotype designated below.

Dolerus nigrominutus Haris, 1998: 131-132. ♂. Holotype. Type locality: Budakeszi Hârsbokorhegy (Hungary). Apex of abdomen missing, genitalia dissected and pinned with the specimen. Paratypes: 3♂. All in HNHM. syn. nov.

Type material examined and taxonomic notes.

Dolerus coruscans Konow, 1890. Fürstenberg /Mecklenburg [Germany]. Lectotype ♂ hereby designated, labelled: " Dolerus varispinus Htg fbg. [ Fürstenberg] 4.84." [Type locality: Germany, Brandenburg, Fürstenberg], " Dolerus coruscan s Knw.", “Type” [red, printed], " Syntypus " [red, printed], "Coll. Konow" [printed], "GBIF-GISHym 3762" [printed], " Lectotypus [printed] ♂ Dolerus coruscans Konow, 1884 M.Heidemaa design. ‘22”, " Dolerus [printed] ♂ coruscans Konow, 1890 [handwritten in block letters] M.Heidemaa det. [printed]". Antennomeres 5-9 missing, genitalia dissected, pinned with the specimen. SDEI. Paralectotype: 1♀ (GBIF-GISHym 3761), Germany, Schönberg [probably Brandenburg]. Here determined as D. anthracinus. SDEI.

Oehlke and Wudowenz (1984) correctly linked D. coruscans Konow, 1890 to the description of D. varispinus Hartig sensu Konow, 1884, but following the definitions used in the Code ( ICZN 1999), they were wrong in categorizing it as a nomen novum proposed as a replacement for a previously existing name. Dolerus coruscans was, in fact, described as a new species, by indication on the description by Konow (1884). Konow (1890a) altered his opinion on his 1884 identification of D. varispinus , and stated that this taxon represented D. anthracinus sensu Thomson. Goulet (1986) followed Konow’s 1890 opinion, but this cannot be accepted, because Konow clearly based his 1884 description on material in his own collection, not in Thomson’s collection. Although D. coruscans was later synonymized ( Enslin 1909) with D. nitens Zaddach, it has been used in published works more than once as a valid name since 1899 (e.g. Dittrich 1905; Fedchenko 1905; Dalglish 1914) and cannot be treated as a nomen oblitum. However, it was listed as a synonym of D. anthracinus by Liston (1981), while Konow (1890b, 1905b) and Cameron (1893) regarded it as possibly conspecific with D. possilensis Cameron. A recent study of the syntypes of D. coruscans (♀, ♂) revealed that the penis valve of the lectotype male (Fig. 17A ) is identical to D. nigrominutus Haris, 1998 (the holotype and two paratype males studied) but the penis valve drawing by Haris (1998) was apparently based on a deformed valve because the other valves examined (including those of the holotype) have no such distinct depression on the ventroapical margin near the valvispina. The paralectotype female of D. coruscans (see above) is probably a female (the only one known at present) of D. anthracinus Klug (nec auct.).

Characters of the female.

The female of D. coruscans , based on two specimens, resembles D. picipes in many characters (the males are even more similar) and the melanic form of D. liogaster with black legs, but differs by its mostly smaller body size of 6-7 mm and the rather inconspicuous setation of the ovipositor sheath (valvula 3) (Fig. 17G ). Due to their similarity, the diagnostic characters of Dolerus coruscans are compared to their states in Dolerus picipes .

Head. (Fig. 17B, C ) Closely resembles D. picipes , but the minimal distance between the antennal sockets is about 2 × the length of the malar space (clearly shorter in Dolerus picipes ). Pits on face and vertex more unevenly distributed and vary more in their size. Postocellar field less distinctly defined than in Dolerus picipes and lateral postocellar furrows less distinct: short and pit-like, rather than long and line-like in Dolerus picipes . Glossy patches beside the lateral postocellar furrows less distinct (almost no difference between the males).

Thorax. (Fig. 17D, E ) The katepimeron of the mesopleuron (Fig. 17D ) with more numerous and distinct pits than in Dolerus picipes . The lateral mesoscutal lobes (Fig. 17E ) less distinctly and rather sparsely pitted.

Abdomen. (Fig. 17F-H ) The ovipositor sheath in dorsal view broadens slightly towards the apex (Fig. 17G ). Cerci (Fig. 17H ) yellowish (black in Dolerus picipes , Fig. 17I ). Setae on valvula 3 rather short and delicate compared to most other Poodolerus species (Fig. 17G, H ). Setae on the abdominal terga shorter and sparser, except on the apical terga. The species can be easily differentiated from D. picipes as follows.

1 a Lateral postocellar furrows distinct: long and line-like b Minimal distance between the antennal sockets about 1.5 × the length of malar space c Ovipositor sheath in dorsal view strongly broadening towards apex, the apical setae well developed and clearly curved (Fig. 17I )	D. picipes (Klug, 1818)
- aa Lateral postocellar furrows indistinct: short and pit-like (Fig. 17C ) bb Minimal distance between the antennal sockets about 2 × the length of malar space (Fig. 17B ) cc Ovipositor sheath in dorsal view slightly broadening towards the apex, the apical setae delicate, nearly straight or slightly curved (Fig. 17G )	D. coruscans Konow, 1890

Distribution.

Dolerus coruscans is recorded from Austria (N-Burgenland, Ungerberg, Weiden am See, 1♀, 24.03.1957, leg. F. Kasy, SDEI), Germany (lectotype: see above), Hungary ( “Budapest”, 1♀, SDEI. Haris 1998, 2003: "Budakeszi, Csepel, Látrány, Rákospalota”; Roller and Haris 2008: "Simontornya, Csévharaszt, Szécsény”, in total 14♂), and Greece (Nom. Grevená, Kónitsa E 28 km Vasilítsa Ski Resort, 40.050°N, 21.050°E, 1780 m, 2♂, 11.05.2007, leg. S. M. Blank et al. / leg. M. Wei, SDEI. The records of D. coruscans from Austria and Greece are the first for these countries. The species apparently has a wide distribution, but is probably seldom collected because of its rarity and early flight period. Probably it has also sometimes remained unidentified, or has been misidentified. Possibly, the males of this species in collections could have been placed under D. picipes and its rather small females have perhaps been mistaken for dwarf females of D. liogaster / D. puncticollis (both species also have melanic color forms).

Remarks.

Haris (2003) speculated that the female of this species might be wingless, or have reduced wings. Present data exclude this possibility. Nor does the female remain unknown, as Haris (1998) suggested it would, because of the destruction of the very small type locality of D. nigrominutus . In Central Europe D. coruscans has been collected early in the season (March-April).

Figures

Figure 17. A-H Dolerus coruscans Konow, 1890; A. Lectotype ♂, penis valve; B. ♀ head frontal (Austria, Burgenland, SDEI); C. ♀ head dorsal (Hungary, HNHM); D. ♀ thorax lateral (Hungary, HNHM); E. ♀ thorax and base of abdomen (Hungary, HNHM); F. ♀ apex of abdomen ventral (Austria, Burgenland, SDEI); G. ♀ valvula 3 dorsal (Hungary, HNHM); H. ♀ valvula 3 lateral (Hungary, HNHM); I. Dolerus picipes (Klug, 1818). ♀ valvula 3 dorsal (ZMUO. 045856).