Lomechusoides amurensis ( Wasmann, 1897 )

Jászay, Tomáš & Hlaváč, Peter, 2013, A taxonomic revision of the myrmecophilous genus Lomechusoides Tottenham, 1939 (Coleoptera: Staphylinidae: Aleocharinae) Part I. Redescription of the genus, definition of species groups and the revision of the amurensis Wasmann 1897 species group, Zootaxa 3683 (1), pp. 65-81 : 71-75

Lomechusoides amurensis ( Wasmann, 1897)

( Figs. 14–27 , 49 )

Lomechusa amurensis Wasmann, 1897: 246

Lomechusa Ganglbaueri Bernhauer, 1936: 323 . Type data: Ostsibirien: Irkutsk (im British Museum und in meiner eigenen Sammlung), Mongolei: Shangai (in der Sammlung des naturhistorischen Staatsmuseum in Wien), part, synonymy in Hlaváč et al., 2011: 14 .

Lomechusa ganglbaueri ssp. uralensis Bernhauer, 1936: 323. Type data: ein weiteres Exemplar vom Ural (Slatoust) [=Zlatousť], synonymy in Smetana, 2004: 457, synonymy confirmed.

Type material studied: Lomechusoides amurensis Wasmann : HOLOTYPE, 13: (h) yellow parabolic label: Amur land / (h) Lomechusa n. sp. nec inflata Thoms. ?? L. sibirica Motsch. / (h) Lomechusa amurensis Wasm. n. sp. Type / round label with red margin: (p) Type / red label: (p) Holotypus, (h) Lomechusa amurensis Wasmann, W. Schillow des. 981 / (p) Sharp Coll 1905-323 / red label (p) HOLOTYPE 3 Lomechusoides amurensis (Wasmann) , P. Hlaváč det. 2007. BMNH.

Lomechusoides ganglbaueri uralensis Bernhauer : HOLOTYPE, 13: (h) Ural, Slatoust [=Zlatousť]/ (h) ganglbaueri Brh. (p) det. Bernh. / orange label (h) ssp. uralensis Bernh. Typus unic. / (p) Chicago NHMus, M. Bernhauer Collection / red label (p) Lomechusa ganglbaueri ssp. uralensis (Bernhauer), P. Hlaváč des., 2009 / Lomechusoides amurensis (Wasmann) = Lomechusa ganglbaueri ssp. uralensis (Bernhauer) P. H l av á č det., 2009. FMNH.

Other material. 1 Ƥ: in Russian characters: Vost. [=eastern] Sayan 1500m, verkh [=top] Kyngarga, 18– 23.07 .95 / iz mkhov [from moss], Shavrin, A. / Lomechusa amurensis Wasm. Shavrin der. 97, in toto in euparal.

CPHK. 1 3: in Russian characters: promysel Ozerpach liman Amura, 16–12.vi.1915, Chernavin / L. amurensis W. Schilov det. 19. ZIN. 1 Ƥ: in Russian characters: Syutszukte, yu-b. [south-east], Kenteys. Z, Urgi, Kozlov, 1.vi. 925. ZIN.

Redescription. Body lighter reddish-brown ( Fig. 49 ); head and narrow basal margin of tergites darker, slightly shining.

Head ( Fig.15 ) quadrate, longer than wide (HW/HL=0.79), with deep median, frontal, triangular depression which is sparsely microsculptured, anterior part shining; length of eyes 0.26 times of length of head; temples slightly convergent posteriorly, posterior corners of temples rounded, posterior margin of head rounded, postoccipital proccess well-defined, protuberant. Antennae ( Fig.16 ) shorter, scape 1.35 times as long as wide and 1.95 times as long as pedicel, all antennomeres elongate except II which is as long as wide, III 1.10 and IV 1.27 as long as wide; antennomeres IV–X elongate, oval, terminal segment thin and acute, 1.15 times as long as scape, relative length of antennomeres from base to apex: 21: 10: 13: 14: 17: 16: 16: 17: 16: 16: 24.

Pronotum ( Fig. 17 ) unicoloured, with clearly convex anterior margin, sides rounded with basal corners obtuse and with deep lateral depressions, surface of this depressions with microsculpture, disc smooth, with sparse, uneven puncturation, basal median lobe large; pronotum in hind corners as wide as humeral width of elytra; ratio: PW/PL =1.42. Metaventrite ( Fig. 18 a) with metaventral process ( Fig. 18 b) with anterior corners sharply angled, anterior margin straight, lateral margins convex, metaventral process in anterior part with lens-like depression bounded with rounded groove, surface unevenly punctured and with short setae, setae not reaching margin of next puncture, metaventral disc lacking microsculpture, unevenly punctured, in places lacking punctures.

Elytra finely punctured, distance between punctures greater than puncture diameter, 1.15 times shorter than pronotum measured on median line, ratio: EW/EL=2.00.

Abdomen with tergite II densely punctured and setaceous, distance between punctures on posterior margin greater than puncture diameter or even double of diameter of puncture, tergites III–IV with fine puncturation and setation on posterior margin, tergites V–VII sparsely but finely punctured at base, densely punctured on lateral parts, tergites II–VIII with visible microsculpture on lateral sides, tergite and sternite VIII as in Figs. 19 a, 19b, 20a, 20b.

Aedeagus as in Figs. 21, 23, 24 , median lobe robust, basal bulb wide with well-developed distal crest and basal bridge. Internal structures weakly-defined, apical lobe tube-like, apical part sharp, with many pseudopores. Paramere ( Fig. 22 ) with triangular paramerite, velum about as large as paramerite, apical lobe subparallel, hookshaped bent backwards, apex with about four setae. Spermatheca as in Figs. 25–27 , basal part V-shaped, apical part as long as basal part, sligthly broader and 2.5–3.0 times as long as wide, internal wall in apical part roughly wrinkled.

Measurements. (Holotype), body length 4.85 mm; forebody length 2.40 mm; head length 0.95 mm; head width 0.75 mm; antennal length 2.60 mm; pronotal length 1.10 mm; pronotal width 1.57 mm; elytral length on sutura 0.85 mm; elytral width 1.70 mm; foretibial length 1.00 mm; midtibial length 1.20 mm; hindtibial length 1.50 mm.

Differential diagnosis. L. amurensis can be distinguished from other species of the group by the characteristic shape of the metaventral process with deep median depression and by the shape of spermatheca.

Host ant. Unknown

Distribution. Russia (Ural, Siberia and Far East) and Mongolia

Lomechusoides schneideri Maruyama et Hlavá č, 2004 ( Figs. 28–31 , 50 )

Lomechusoides schneideri Maruyama & Hlaváč, 2004: 110 . Type data: China m., 19–VII–1992, Sichuan, 3,600 m, Kangding env.

Type material studied. HOLOTYPE, 1 Ƥ: (p) China m., 19.7.1992, Sichuan, 3600m, Ken ding env., J. Schneider legit. / (p) ex coll. M. Dvořák, National Museum Prague, Czech Republik/ red label (p) Holotype, Lomechusoides schneideri des. Maruyama & Hlaváč, 2004.

Supplementary description. The species was recently adequately described by Maruyama & Hlaváč (2004: 110). Head ( Fig. 28 ), pedicel as long as wide, antennomere III about 1.4 times as long as wide, both equal in length, relative length of antennomeres from base to apex: 22:11:12:14:15:16:15:15:15:14:20. Pronotum ( Fig. 29 ) with sides and medium line with dense microsculpture, dull, pronotal disc near medium line with fine microsculpture, glossy.

Pronotum in hind corners wider than humeral width of elytra. Metaventrite with metaventral process with anterior corners sharply angled, anterior margin slightly convex, lateral margins convex ( Fig. 30 ), metaventral process in anterior part lacking shalow depression and rounded groove, whole surface of metaventrite unevenly but densely punctured and with short setae, setae reaching margin of next puncture, metaventral disc with sparse microsculpture. Basal part of elytra densely punctured, distance betwen puntures shorter than diameter of puncture, densely and markedly microsculptured, dull, rest of surface of elytra coarsely punctured, lacking microsculpture, glosy. Abdomen with tergite II densely punctured and setaceous, distance between punctures on posterior margin as long or slightly longer than puncture diameter, posterior margin of tergites III–IV with fine, sparse puncturation and setation, tergite IV much sparsely punctured than III, tergites V–VI sparsely, finely and evenly punctured, tergites II–VI in basal part with fine microsculpture, tergite and sternite VIII as in Figs 31 a, 31b.

Diferencial diagnosis. L. schneideri can be easily distinguished from the other species of the L. amurensis group by the long and quadrate head and long, subparallel temples. Host ant. Myrmica cf. ruginodis Nylander, 1846

Distribution. China (Sichuan)

Figures

FIGURES 14 – 20. L. amurensis, 14, posterior margin of right elytra, chaetotaxy; 15, head, dorsal view (L: 0.95 mm, W: 0.75 mm) (scale: 0.5 mm); 16, 3 antenna (scale: 0.5 mm); 17, Ƥ pronotum, dorsal view (L: 1.10 mm, W: 1.57 mm) (scale: 0.5 mm); 18 a, 3 metaventrite (L: 1.15 mm, W: 1.35 mm) (scale: 0.5 mm); 18 b, 3 metaventral process; 19 a, 3 tergite VIII, (scale: 0.5 mm), 19 b, 3 sternite VIII (scale: 0.5 mm); 20 a, Ƥ tergite VIII (scale: 0.5 mm), LECTOTYPE of L. ganglbaueri; 20 b, Ƥ sternite VIII (scale: 0.5 mm). LECTOTYPE of L. ganglbaueri.

FIGURES 21 – 27. L. amurensis, 21, 3 aedeagus, lateral view (scale: 0.5 mm); 22, 3 right paramera, lateral view (scale: 0.5 mm); 23, 3 aedeagus, lateral view (scale: 0.5 mm), HOLOTYPE; 24, 3 aedeagus, lateral view, (scale: 0.5 mm) from Vladivostok; 25, Ƥ spermatheca (scale: 0.2 mm), LECTOTYPE of L. ganglbaueri; 26, Ƥ spermatheca (scale: 0.2 mm) from Irkutsk; 27, Ƥ spermatheca (scale: 0.2 mm) from Ural

FIGURES 48 – 50. 48, L. strumosus from Bardejov, Slovakia, habitus; 49, L. amurensis, from Irkutsk, habitus; 50, L. schneideri, HOLOTYPE, habitus

FIGURES 28 – 31. L. shneideri Ƥ HOLOTYPE, 28, Ƥ HOLOTYPE, head, dorsal view (L: 0.78 mm, W: 0.60 mm), (scale 0.5 mm); 29, Ƥ HOLOTYPE, pronotum, dorsal view (L: 1.05 mm, W: 1.53 mm), (scale: 0.5 mm); 30, Ƥ HOLOTYPE, anterior metaventral process; 31 a, Ƥ HOLOTYPE, tergite VIII (scale: 0.5 mm); 31 b, sterniteƤ HOLOTYPE, VIII (scale: 0.5 mm).