Lomechusoides strumosus ( Fabricius, 1792 )

Jászay, Tomáš, Hlaváč, Peter & Baňař, Petr, 2023, A taxonomic revision of the myrmecophilous genus Lomechusoides Tottenham, 1939 (Coleoptera: Staphylinidae: Aleocharinae). Part II. The revision of the strumosus species group, Zootaxa 5343 (6), pp. 539-593 : 580-583

Lomechusoides strumosus ( Fabricius, 1792)

Figs 124–132

Staphylinus strumosus Fabricius, 1792: 525 Type data: Halae.

Lomechusa strumosa var. caucasica Wasmann, 1897: 249 Type data: Caucasus, synonymy in Smetana, 2004: 457, Schülke & Smetana, 2015: 663, synonymy of L. teres .

Material studied. Type material was not available for the study. Other material studied. Austria: 2♁♁: (p) Rekawinkel, A. I., O. Scheerpeltz / (h) strumosa / (h) Lomechusa strumosa (MZLU) . 2♀♀: (h) Pfaffenberg b. [=bei] Heinburg, A. i./ (h) leg. Scheerpeltz, 28.III.26. / (p) Museum Entomologicum Lund, Suecia ( ZMLU). 1♁: (h) Marzer K̂gel, Marz-Rohrb. [=Rohrbach], Burgenland / (h) O. Scheerpeltz, 1.V.1926 / (p) Museum Entomologicum Lund, Suecia ( ZMLU). Czech Republic: 3 ♁♁ 1♀: (p) Bohemia, Týn n. Vlt. [=Týn nad Vltavou], Machulka ( NMPC). 3 ♁♁ 1♀: (h) Böhmerwald, K. Klein/(h) Lomechusa strumosa Grav. (NMPC) . 1♁: (p) Boh. Sobotka, (h) 1311/(p) lgt. Samšiňák/(h) Lomechusoides strumosus F. (p) det. M. Dvořák (h), 86 ( NMPC). 1♁: (p) Moravia, (h) Obůrka 25.8.40, (p) Coll. Hlisnikowski 19 ( NMPC). 2♀♀: (h) Obůrka, 23.VIII.41., inž. P. (illegible name) ( NMPC). 2♀♀: (h) Obůrka,25.8.41., inž. P. (illegible name) ( NMPC). 2♀♀: (h) Obůrka, 18.9.41., inž. P. (illegible name) ( NMPC). 8♁♁ 8♀♀: (h) Obůrka, 20.9.41., inž. P. (illegible name) ( NMPC). 2♁♁: (h) Obůrka, 23.9.41., inž. P. (illegible name) ( NMPC). 1♀: (h) Obůrka, 25.9.41., inž. P. (illegible name) ( NMPC). 2♁♁: (h) Obůrka, 30.9.41., inž. P. (illegible name) ( NMPC). 1♁ 4♀♀: (h) Tábor, 18.V.41/(h) Lomechusa strumosa Grav. (NMPC) . 1♀: Tábor, 20.V.41/(h) Lomechusa strumosa Grav. (NMPC) . 1♀: (p) Dobřichovice, Bohemia 1913, S. Vávra, 10.V. ( NMPC). 1♁ 1♀: (p) Bohem. Vrané, (h) Zvole 1917/IV.27, (p) Dr. Rambousek ( NMPC). 1♀: (p) Bohem. Vrané, (h) Zvole 1925/V.24, (p) Dr. Rambousek ( NMPC). 1♁ 1♀: (h) Vrané, Machulka ( NMPC). 1♀: (h) Sazau (p) Bohemia, Dr. Clemens Rodt./(h) 5/11 ( NMPC). 1♁ 1♀: (p) Vran bei Prag, Dr. Rodt./(h) 4/4 ( NMPC). 2♁♁ 4♀♀: (h) Vrané 12.5.08 ( NMPC). 1♀: (h) Vrané, 26.4.09 ( NMPC). 5♀♀: (h) Vrané, 26.4.09/(h) Lomechusa strumosa (p) det. Dr. Rambousek ( NMPC). 1♀: (p) Vrané ( NMPC). 1♁ 2♀♀: (h) Vrané, Machulka ( NMPC). 1♁: (h) Radotín, Machulka ( NMPC). 1♁ 1♀: (p) Bílá, Morava, Machulka ( NMPC). 1♁ 2♀♀: (p) Nové Hrady, Dr. Lokay/(p) ♁/(p) Lomechusa strumosa (NMPC) . 1♁ 2♀♀: (p) Schwatz b. Teplitz/(p) Lomechusa strumosa (NMPC) . 2♀♀: (p) März. 1913, Wran a. M./(p) Env. de Prague, Col. Matcha ( NMPC). 1♁: (p) Radotin (h) 17.3.07/(p) Lomechusa strumosa (NMPC) . 3♁♁: (h) Černošice, Machulka ( NMPC). 1♀: (p) Nová Huť, Dr. Lokay/(p) Lomechusa strumosa (NMPC) . 1♀: (p) Vrané n. Vlt., Th. Krása ( NMPC). 1♀: (p) Písek Boh., Coll. Dr. Mařan ( NMPC). 2♀♀: (p) Jíloviště, 24.IV.10 ( NMPC). 3♁♁: (p) Bohemia, Sazava, Machulka ( NMPC). 1♀: (h) 5.IV.1910 (p) Bohemia (h) Unhošt (p) J. Tyl ( NMPC). 3♁♁ 3♀♀: (p) Bohem. Vrané (h) Chlumík 1918/IV.24. (p) Dr. Rambousek ( NMPC). 2♁♁ 2♀♀: (p) Bohemia Dr. Bílek/(h) Klatovy ( NMPC). 2♁♁ 4♀♀: (h) Bohemia /(h) Lomechusa strumosa (NMPC) . 2♁♁: (p) Bohem./(h) strumosa (NMPC) . 1♁: (p) Bohemia Dr. Jureček ( NMPC). 1♀: (p) Moravia Bruna, Dr. Fleischer ( NMPC). 1♁ 1♀: (p) N. Hütt. /(h) L. Form. sanguinea (NMPC) . 1♀: (p) Nová Huta, Dr. Lokay /(p) Lomechusa strumosa (NMPC) . 1♀: (h) Silesia, R. Zoufal / (p) 84 / (h) Lomechusoides strumosus (F.) ( MZLU). 1♁ (h) Boehm. Wld. / (p) к. Кенига. [=Coll. K̂nig] / (h) Lomechusa strumosa (ZIN) . Finland: 1♁: (p) Helsinge / (p) Karvonen ( ZMLU). 1♁: (p) Fennia Nyl., Helsingfors, O. Wellenius / (p) 16.V.1903 / (p) in nido Formicae sanguineae / (p) Lomechusa strumosa Fabr., O. Wellenius det. ( ZMLU). 1♁ 1♀: (h) Fennia Vehkalahti, 2.VI.1962, L. Tiensuu / (h) Lomechusa strumosa Grav. (ZMLU) . 1♀: (p) P. [= Pirkanmaa region] Pirkkala, Grönblom ( ZMLU). 1♀: (p) Fennia, Joutseno, Thuneberg / (p) 375 ( ZMLU). 1♁: (p) Tampere / (p) Söyrinki / (h) Lomechusa strumosa / (h) strumosa (ZMLU) . 2♀♀: (p) Suomi U: Helsinki (p) 1 (h) 6.5. (p) 19 (h) 51, (p) leg. E. Kangas / (p) http://id.luomus.fi/GAC.26865, http://id.luomus. fi/GAC.26863 Lomechusoides wellenii ( Palm, 1949) , E. Kangas det. ( MZHF). 2♁♁ (p) Suomi U: Helsinki (p) 1 (h) 6.5. (p) 19 (h) 51, (p) leg. E. Kangas / (p) http://id.luomus.fi/GAC.26868, http://id.luomus.fi/GAC.26866 Lomechusoides wellenii ( Palm, 1949) , E. Kangas det. ( MZHF). Germany: 2♁♁: (p) Ulm, Württbg./(p) Lomechusa strumosa (NMPC) . 1♀ (Germany Main): (p) Ty [=???=Tyrolia] ( ZMLU). 1♀: (h) German / (h) Lomechus strumosa / (p) (p) к. Кенига. [=Coll. König] ( ZIN). 1♁: (h) German / (h) L. strumosa F. / (p) (p) к. Rковлева [=Coll. Yakovleva] ( ZIN). Russia: 1♁: (p) Моск. обл. (h) Николина Гора [=Moskovskaya oblasť Nikolina Gora] 15-VI.1952 ( ZIN). 1♁ 1♀: (h) б. ЧернаЯ Лахта [=ЧёрнаЯ Лахта =Chornaya Lakhta], Петергофск. у. [=Petergofskiy uezd], Буваль 9.VI.99 ( ZIN). 1♁ 1♀: (h) 25.VI.- 60г. Бaйкал, падь ” ЖилиЩе” собр. Росмер. [=Baikal, “Zhilishche” Rosmer leg]/ (h) Lomechusa strumosa / (h) Shavrin Coll. ( ASHC). Slovakia: 1♀: (p) SK: Bardejov dol. Mních. pot.[dol.= dolina= valley Mních.= Mníchovského, pot.= potoka= stream], Formica polyctena , 10.V.2001 lgt. T. Jászay ( SMB). 1♁: (p) SK: Bardejov dol. Mních. pot., Formica polyctena , 8.III.2002 lgt. T. Jászay ( SMB). 1♁: (h) V. Tatry, Štola [=Štôla]/(h) strumosa Grav. (p) det. J. Havelka ( NMPC). Sweden: 1♀: (p) Sk. Vankiva s:n, (h) 5.4.1961, 33727 (p) G. Israelson ( ZMLU). 1♁ 1♀: (p) Sk. [= Skåne County], coll. C. G. Thomson ( ZMLU). 1♁: Släp, Halland, Sandin ( ZMLU). 2♀♀: (p) Ҕalland Sväp, Ågren ( ZMLU). 1♀: (h) Sk Hässleholm, 9.5.1987, Gillerfors ( ZMLU). 1♁ 1♀: (h) Sm. [=Småland] Kalmar, 1.5.80, B. Anderson ( ZMLU). 1♀: (p) Nb [=Norbotten] (h) Sangis, (p) S. Lundberg ( ZMLU). 1♁ 1♀: (h) Vb. Seglora, 6.4.1963, R. Essen / (h) Lomechusa strumosa (ZMLU) . 5♁♁ 2♀♀: (h) 1496 [on transparent stick label] / (p) S: Lu. Kuotka, 9.5.1975, leg. Stig Lundberg / (h) Lomechusa strumosa (p) det. Ambĵrn Carlsson, Data Zoo-Tax ( ZMLU). 2♁♁ 1♀: (p) S: Sk. Vittsjö, (h) 24.5.1980 /(h) Lomechusa strumosa (p) det. Ambjörn Carlsson 19 (h) 81 ( ZMLU). 1♀: (p) Dalarna, St. Kopparberg, Klefbeck ( ZMLU). 1♁: (h) Lomechusa, Sk. [= Skåne County], coll. C. Haglund ( ZMLU). 1♁: (p) Sk. Klostersågen, (h) 1982.05.15, 2405 (p) H. Andersson ( ZMLU). 1♁: (p) Sk. Vankiva s:n, (h) 9-4 (p) 196 (h) 1, F. Olsson ( ZMLU). 1♀: (p) Sk. Vankiva s:n, (h) 24-3 (p) 196 (h) 1, F. Olsson ( ZMLU). 2♁♁: (p) Sk. Hässleholm, (h) 21-4 (p) 196 (h) 9, F. Olsson ( ZMLU). 2♁♁ 1♀: (p) Sk. Hässleholm, (h) 7-5 (p) 19 (h) 77, F. Olsson ( ZMLU). Switzerland: 1♀: host ant on label (h) Pontresin / (p) кол. РCО (Елены Павл.) / (p) Helena Pavlov / (h) strumosa Grav (ZIN) .

Description. Body light reddish-brown ( Fig. 124 ) except clypeus, labrum, terminal antennomeres, narrow anterior margin of visible tergites II–IV, anterior margin of visible tergite V, larger part of anterior margin of visible tergites VI–VII, lateral part of visible sternites III–IV, larger part of posterior margin of visible sternite V, larger part of anterior margin of visible sternite VI and anterior margin of visible sternite VII, metaventrite except anterior part of its metaventral process and posterior margin of metaventrite and epimeral and episternal sclerites brown.

Head rectangular, longer than wide, ratio HW/HL: ♁ 0.77, ♀ 0.81, with deep U-shaped frontal median impression, which is evenly microsculptured with weakly visible fine punctures, dull; disc of head evenly microsculptured and finely punctate, dull; length of eyes ♁ 0.20, ♀ 0.27 of length of head; eyes slightly protuberant, temples narrowed behind eyes, convergent and concave posteriorly. Antennae short, scape ♁ 1.33x, ♀ 1.27x as long as wide and ♁ 2.18x, ♀ 2.09x as long as pedicel, pedicel ♁ 0.95x, ♀ 0.91x as wide as long, antennomere III: ♁ 1.50x, ♀ 1.33x, IV: ♁ 1.07x, ♀ 1.07x and V: ♁ 1.25x, ♀ 1.20x as long as wide, antennomeres X truncate, cone-shaped ( Fig. 108 ), terminal antennomeres slender and acute, ♁ 1.25x, ♀ 1.26x as long as scape, relative length of antennomeres from base to apex: ♁: 24: 11: 18: 14: 15: 16: 16: 15: 15: 14: 30, ♀: 23: 11: 16: 14: 15: 16: 15: 15: 14: 13: 29.

Pronotum ( Fig. 125 ) rectangular, ratio PW/PL: ♁ 1.71, ♀ 1.66, with clearly concave anterior margin, anterior corners obtuse, lateral sides in anterior third widely rounded, in basal two thirds straight or slightly concave, subparallel posteriorly, basal corners rectangular, bearing microsculptured and unevenly punctate wide, shallow lateral impressions, pronotal disc more finely microsculptured, dense and unevenly punctate, tubercles well-defined; median line well-defined; in lateral view lateral margins in anterior half thick, in posterior half thin and broadly curved posteriad, lacking visible sharp edge; maximal pronotal width in posterior corners, here as wide as width of elytra at humeri; pronotum with macrosetae, anterior margin with about four macrosetae, lateral margins with about six macrosetae.

Anterior and lateral margins of metaventral process ( Fig. 130 ) concave, metaventral process in anterior part with lateral, clearly anteriad convergent lines, anterior part lacking transversal elevation, in median line lacking roof-like elevation and posterior part in median line lacking lentil-like impression, metaventral process microsculptured and sparsely punctate; metaventral disc with wide, posterior shallow longitudinal impressions on lateral sides of median line, metaventrite microsculptured and densely punctate, with short setae not reaching margin of adjacent puncture.

Elytra finely punctate ( Fig. 126 ), elytra ♁ 0.89x, ♀ 0.98 as long as pronotum, ratio EW/EL: ♁ 2.15, ♀ 2.09, anterior part with 10–12 and humeral part with one–three macrosetae, distance between punctures on disc 2–2.5x of diameter of puncture.

Abdomen with visible tergite II densely punctate and setaceous, visible tergites III–IV densely punctate and setaceous on posterior margin, anterior parts with fine and sparse puncturation, visible tergite V finely and sparsely punctate, posterior margin slightly densely punctate, visible tergites VI–VII sparsely punctate, lateral parts with more dense puncturation, with slightly larger diameter of puncture, visible tergites II, VI–VII evenly microsculptured, visible tergites III–V unevenly microsculptured.

Aedeagus ( Figs 127–128 ) with robust median lobe, apical lobe tube-like and shorter than basal bulb, apex acute with scattered pseudopores, in lateral view ventral side slightly convex and apex sharp, lateral sides of apical lobe at apex slightly convergent in ventral view. Ventral protuberance on basal bulb subparallel, 3.4x as long as wide. Apical lobe of parameres at apex narrowed apically ( Fig. 131 ), hook-like shaped and bent backwards, apex with about 3 setae and few scattered pseudopores, lacking minute microsetae.

Spermatheca ( Fig. 132 ) with apical part slightly shorter, 0.94x of length of basal part and 1.22x (in widest part) wider than basal extended part and 2.75x as long as wide, apical part subparallel or slightly narrowed apically, apex rounded. Variability of spermatheca: apical part always shorter, at most as long as basal part.

Measurements. (♁): TL 6.03 mm; FL 3.12 mm; HL 1.10 mm; HW 0.85 mm; antennal length 2.90 mm; PL 1.07 mm; PW 1.77 mm; EL 0.95 mm; EW 2.05 mm; FTL 1.15 mm; MTL 1.45 mm; HTL 1.75 mm. (♀): TL 6.60 mm; FL 3.35 mm; HL 1.10 mm; HW 0.90 mm; antennal length 2.95 mm; PL 1.15 mm; PW 1.92 mm; EL 1.05 mm; EW 2.20 mm; FTL 1.25 mm; MTL 1.55 mm; HTL 1.92 mm.

Differential diagnosis. L. strumosus is separated from L. dlabolai , L. dudkorum , L. fallax , L. reitteri , L. richteri , L. rossii , L. sibiricus , L. siculus , L. teres , L. zerchei and L. zeyai by posterior angles of the pronotum forming 90 degree angles and from L. dlabolai and L. reitteri by the larger size and bicoloured body. From L. folgaricus it differs by concave temples, by well-defined tubercles on the disc of the pronotum, by rounded apex of the apical part of the spermatheca and by lacking distinct tubercle on the transversal crest of the aedeagus. From L. penicillatus by shorter antennomeres and from L. primoricus and L. wellenii it differs by unicoloured pronotum.

Host ant. Formica fusca Linnaeus, 1758 , F. polyctena Foerster, 1850 , F. pratensis Retzius, 1783 , F. rufa Linnaeus, 1761 , F. rufibarbis Fabricius, 1793 , F. sanguinea Latreille, 1798 , Myrmica rubra (Linnaeus, 1758) and M. scabrinodis Nylander, 1846 .

Distribution. Austria, Belarus, Czech Republic, Finnland, Germany, Russia, Slovakia, Sweden, Switzerland.

Figures

FIGURES 124–132. Lomechusoides strumosus Fabricius, 1792. 124, male, dorsal habitus; 125, male, pronotum in dorsal view (L: 1.07 mm, W: 1.77 mm), (locality: Bohemia: Týn nad Vltavou); 126, male, microstructure of elytra with setation; 127, male, aedeagus, lateral view; 128, male, aedeagus, ventral view; 129, female, antennomeres IX–X, (locality: Bohemia: Týn nad Vltavou); 130, male, metaventral process; 131, male, apex of paramere; 132, female, spermatheca, (locality: Bohemia: Týn nad Vltavou). Scale bars in mm.

FIGURES 102–108. Lomechusoides rossii sp. nov. 102–107, male holotype. 102, dorsal habitus; 103, pronotum in dorsal view (L: 1.10 mm, W: 1.85 mm); 104, aedeagus, lateral view; 105, aedeagus, ventral view; 106, metaventral process; 107, apex of paramere; 108, female paratype, spermatheca. Scale bars in mm.