Lomechusoides primoricus Jászay, Hlaváč & Baňař, 2023

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 : 568-570

Lomechusoides primoricus Jászay, Hlaváč & Baňař sp. nov.

Figs 82–88

Etymology. Named after Primorsky kray, the type locality.

Material studied. HOLOTYPE, ♁: RUSSIA: (p) Russia: Primorskij kray [= Primorsky Kray], Sikhote-Alin, Meteorol.St. , 28km SE/ (p) Chuguyevka , 900m, 43.59 N 134.08 E, 1.VI.1993, leg. Zerche / red label (p) HOLOTYPE ♁ Lomechusoides primoricus sp. nov., det. T. Jászay, P. Hlaváč & P. Baňař det., 2021 ( DEI) . PARATYPES, 2♁♁, 1♀♀: same data as for holotype ( DEI, PCPB) . 1♁, 1♀: (h) окр. с. Бирское Бикан. р-н., Хабар. кр., Кабаков. 28– 31.V.958 [=окрестности села Бирское, Бикинский район, Хабаровский край, О. Н. Кабаков. = оkrestnost´sela Birskoe (=vicinity of village Birskoe ), Bikinskiy district , Khabarovsk territory, O. N. Kabakov] ( ZIN) . 2♁♁, 2♀♀: (p) As. or. 919, Vladivostok, Dr. Jureček. ( NMPC) . 1♁: (p) Asia or., Ussuria, Sibir or., 4/1919, Vladivostok, Dr. Št. Jureček lgt. ( NMPC) . All paratypes are bearing printed red label: PARATYPE ♁ or ♀ Lomechusoides primoricus sp. nov., det. T. Jászay, P. Hlaváč & P. Baňař det., 2021.

Description. Body light reddish-brown ( Fig. 82 ) except clypeus, labrum, antennae, disc of pronotum, anterior margin of visible tergites II–IV, larger part of anterior margin of visible tergites V–VII, lateral part of visible sternites III–V, narrow posterior margin of visible sternite V, larger part of anterior margin of visible sternites VI–VII, metaventrite except anterior margin of its metaventral process and narrow posterior margin of metaventrite, episternal and epimeral sclerites and posterior margin of metepimeral sclerite brown.

Head rectangular, longer than wide, ratio HW/HL: 0.86, with deep, round, median frontal impression which is unevenly microsculptured, posterior part of impression with large and shallow punctures, glossy; disc of head microsculptured and slightly punctate, dull; length of eyes 0.21x of length of head; eyes distinctly protuberant, temples behind eyes strongly narrowing, subparallel posteriorly. Antennae long, scape ♁ 1.62x, ♀ 1.50x as long as wide and ♁ 2.60x, ♀ 2.40x as long as pedicel, pedicel ♁ 0.91x, ♀ 0.95x, antennomere III: ♁ 1.33x, ♀ 1.41x, IV: ♁ 1.00x, ♀ 1.07x, V: ♁ 1.36x, ♀ 1.31x as long as wide, antennomeres V–VIII elongate, terminal segment slender and acute, ♁ 1.19x, ♀ 1.37x as long as scape, relative length of antennomeres from base to apex: ♁: 26: 10: 16: 15: 17: 17: 17: 16: 16: 16: 31; ♀: 24: 10: 17: 15: 17: 17: 16: 16: 16: 16: 33.

Pronotum ( Fig. 83 ) rectangular, ratio PW/PL: 1.73 with slightly concave short anterior margin, anterior corners obtuse, lateral sides in first half broadly rounded, posterior half very slightly concave, subparallel, posterior corners rectangular, bearing deep lateral microsculptured impressions, which are deeper in middle, posterior half of impressions unevenly microsculptured and sparsely punctate, anterior part of lateral impressions evenly microsculptured and densely punctate, pronotal disc finely and unevenly microsculptured, sparsely unevenly punctate, tubercles well-defined; median line well-defined, narrow; in lateral view lateral margins thick and equally thinned posteriad, in posterior third with visible sharp edge which is strongly curved posteriad; maximal width of pronotum at posterior corners, here as wide as elytra at humeri; pronotum with macrosetae, anterior margin with about four, lateral margins with about five macrosetae.

Anterior and lateral margins of metaventral process ( Fig. 86 ) concave with lateral lines convergent anteriad, anterior part with weakly-defined transversal carina, posterior part in median line lacking lentil-like impression, metaventral process microsculptured, sparcely punctate; metaventral disc in posterior part with weakly-defined longitudinal shallow impressions on sides of median line, metaventrite unevenly microsculptured and sparsely punctate, with long setae reaching margin of adjacent puncture.

Elytra densely punctate, 0.95x as long as pronotum, ratio: EW/EL: 2.10, with about five–seven macrosetae on anterior part and about one–two macrosetae on humeral part; distance between punctures on disc of elytra about 1.5–2.0x as long as diameter of puncture.

Abdomen with visible tergite II densely punctate and setaceous, visible tergites III–V finely and densely punctate and softly setaceous on posterior margin, visible tergites VI–VII with fine puncturation on posterior margin and with dense puncturation with slightly larger punctures on lateral parts, visible tergite II unevenly microsculptured, visible tergites III–VII lacking microsculpture.

Aedeagus ( Figs 84–85 ) with robust median lobe, apical lobe tube-like, apical part short and sharp, with poorly scattered pseudopores, ventral side slightly convex in lateral view, lateral sides of apical lobe in ventral view slightly convergent apically. Apical lobe of parameres narrow and subparallel ( Fig. 87 ), hook-shaped and bent backwards, before apex bootle-neck strangulated, apex with about three setae and about three minute microsetae.

Spermatheca ( Fig. 88 ) apical part 1.25x as long as basal part and 1.30x (on widest part) wider than basal extended part and 2.60x as long as wide, apical part subparallel apically, apex rounded.

Measurements. (♁, Holotype): TL 6.25 mm; FB 3.05 mm; HL 1.05 mm; HW 0.90 mm; antennal length 3.20 mm; PL 1.10 mm; PW 1.90 mm; EL 1.05mm; EW 2.20 mm; FTL 1.25 mm; MTL 1.45 mm; HTL 1.80 mm. (♀, Paratype, from the same locality as holotype): TL 6.60 mm; FB 2.95 mm; HL 1.03 mm; HW 0.90 mm; antennal length 3.20 mm; PL 1.10 mm; PW 1.85 mm; EL 1.00 mm; EW 2.20 mm; FTL 1.25 mm; MTL 1.45 mm; HTL 1.80 mm. (♁, Paratype, leg. Jureček): TL 7.50 mm; FB 3.15 mm; HL 1.10 mm; HW 0.85 mm; antennal length 3.35 mm; PL 1.25 mm; PW 1.92 mm; EL 1.05mm; EW 2.25 mm; FTL 1.25 mm; MTL 1.55 mm; HTL 1.90 mm.

Differential diagnosis. L. primoricus is separated from L. dlabolai and L. reitteri by the larger size and the bicoloured body and the rectangular pronotum. From L. dudkorum , L. fallax , L. richteri , L. rossii , L. sibiricus , L. siculus , L. teres , L. zerchei and L. zeyai it differs by posterior 90 degree angles of the pronotum. From L. penicillatus it differs by shorter antennomeres. From similar L. folgaricus , L. strumosus and L. wellenii by the presence of a visible sharp edge on lateral margins of the pronotum in the lateral view.

Host ant. Unknown.

Distribution. Russia (Khabarovsk and Primorsky territory).

Figures

FIGURES 82–88. Lomechusoides primoricus sp. nov. 82, male paratype, dorsal habitus; 83–87, male holotype (locality: Russia: Primorsky territory: Sikhote-Alin). 83, pronotum in dorsal view (L: 1.10 mm, W: 1.85 mm); 84, aedeagus, lateral view; 85, aedeagus, ventral view; 86, metaventral process; 87, apex of paramere; 88, female paratype, spermatheca, (locality: Russia: Primorsky kray: Sikhote-Alin). Scale bars in mm.