Lomechusoides suensoni ( Bernhauer, 1936 )

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 th, Zootaxa 3683 (1), pp. 65-81: 75-77

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Lomechusoides suensoni ( Bernhauer, 1936 )


Lomechusoides suensoni ( Bernhauer, 1936) 

( Figs. 32 –41View FIGURES 32 – 41. L, 51View FIGURES 51 – 52. 51, L)

Lomechusa Suensoni Bernhauer, 1936: 323  . Type data: ein einziges Stück von (Nordalpen von Japan), 5000 ft. Lomechusa suensoni Bernhauer  : Schilow, 1981: 218, synonymy to Lomechusa amurensis 

Lomechusa hosodai Sawada, 1994: 363  . Type data: Mt. Hoozan, Yamanashi Pref., central Japan, synonymy confirmed Lomechusoides hosodai ( Sawada, 1994)  : Maruyama & Hlaváč, 2004: 112 (new combination)

Lomechusoides hosodai ( Sawada, 1994)  : Hlaváč & al., 2011: 9 (synonymy to L. amurensis  due to the synonymy of L. suensoni  )

Type material studied. HOLOTYPE, 1 Ƥ: (h) Kamikochi 5000 f. North. Alps Japan / (h) E. Suenson 16.IX. 1934 / (h) Nothern Alps Japan /(h) Suensoni  Brn. Typ un. / (h) Suensoni  Bernh. Typus unic. Lomechusa  / (p) Chicago NHMus M. Bernhauer Collection / (h) L. amurensis  W. (p) W. Schilov 19 / red label (p) Lomechusa suensoni Bernhauer  det. Maruyama 2001 / red label (p) Holotype Lomechusoides suensoni Bernhauer, 1936  , T. Jászay & P. Hlaváč det., 2012. ( FNHM). Other material: 13: (p) Japan: Hon Shu, Hoo goya Hoo-san, Yamanashi Pref.. 2.IX. 1987, K. Hosoda leg. /(h) same locality and collector as Ƥ / Topotypes of L. hosodai  , PHKS; 1 Ƥ: (p) Houou [Hôô] lodge, Yamanashi, 16.IX. 1991, K. Hosoda / slide no. 0 0 86, M. Maruyama, 1999, PHKS; 13: (p) Houou lodge, Yamanashi, 20.IX. 1991, K. Hosoda / Yasuhiko Hayashi, Collection, Aleocharinae  , KUECAbout KUEC; 1 Ƥ: (h) Near Shibunoyu, Kita-Yatsugatake, 11.IX. 1977, Hideo Yada leg. / Shibata coll., KUECAbout KUEC; 1 Ƥ: (h) Nomugi-Pass, Nagano Pref., 18.IX. 1987, S. Tsuyuki leg. / Shibata coll. / slide no.0088, M. Maruyama 1999, KUECAbout KUEC; 13: Mugikusa-toge (2050–2100), Sakuho-chô, Nagano-ken, 8.VI. 2008, R. Shimoyama leg., KUECAbout KUEC; 13, 1Ƥ: Mugikusa-toge (2050– 2100), Sakuho-chô, Nagano-ken, 8.V. 2010, R. Shimoyama leg., KUECAbout KUEC; 13: Hôô-goya (2400 m), Hôô-san, Yamanashi-ken, 5.X. 1988, K. Hosoda leg., KUECAbout KUEC; 13: Jônen-goya (2400 m), Jônen-dake, Hodaka-machi, Minamiazumi-gun, Nagano-ken, 29.IX. 2000, Y. Ôshima leg., KUECAbout KUEC; 13: Kurumijima, Asahi-chô, Takayama-shi, Gifu-ken, 20 / 21.VIII. 1992, Y. Takai leg., KUECAbout KUEC; 1 Ƥ: Shôgen-toge (1800 m), Tabayama-mura, Yamanashi-ken, 18.VII. 1951, S. Tsuyuki leg., KUECAbout KUEC; 13: Sawabi-daira/Chichibu-zawa (1600 m), Hida-sanmyaku, Gifu-ken, 15.IX. 1988, Y. Takai leg., KUECAbout KUEC.

Redescription. Body lighter reddish-brown ( Fig. 51View FIGURES 51 – 52. 51, L), head, and wide basal margin of tergites darker.

Head quadrate, longer than wide (HW/HL= 0.86), with shallow median, sparsely microsculptured frontal triangular depression, anterior part shining, length of eyes 0.25 that of head; temples in middle slightly narrowed, extended posteriorly, postoccipital process well-defined ( Fig. 32View FIGURES 32 – 41. L). Antennae ( Fig. 33View FIGURES 32 – 41. L) longer, scape 1.65 times as long as wide and 2.35 times as long as pedicel, all antennomeres elongate, pedicel 1.1 times as wide as long, antennomeres III 1.16 and and IV 1.10 as long as wide, terminal antennomere thin and acute, 1.10 times as long as scape, relative length of antennomeres from base to apex: 20: 10: 13: 15: 17: 17: 17: 16: 16: 16: 22.

Pronotum ( Fig. 34View FIGURES 32 – 41. L) bicoloured, pronotal disc slightly darker, with clearly convex anterior margin, sides straight, extended posteriorly, round in posterior third with deep lateral depressions, surface of this depressions with weak microsculpture, disc smooth, with dense, uneven puncturation, basal median lobe broadly rounded, pronotum in hind corners as wide as humeral width of elytra; ratio: PW/PL = 1.52. Metaventrite with metaventral process with anterior corners sharply angled, anterior margin straight, lateral margins convex ( Fig. 35View FIGURES 32 – 41. L), metaventral process in anterior part with weakly defined lens-like depression bounded with rounded groove, surface unevenly punctured and with short setae, setae reaching margin of next puncture, metaventral disc with sparse microsculpture.

Elytra finely punctured, distance between punctures longer than puncture diameter, 1.13 times shorter than pronotum on median line, ratio: EW/EL= 1.71.

Abdomen with tergite II densely punctured and setaceous, distance between punctures on posterior margin greater than double of puncture diameter, 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 lacking microsculpture, only tergites V–VI with microsculpture on lateral sides, tergite and sternite VIII as in Fig. 36View FIGURES 32 – 41. L a, 36 b, 37 a, 37 b.

Aedeagus as in Fig. 38View FIGURES 32 – 41. L median lobe robust, basal bulb wide with well-developed distal crest and basal bridge, internal structures weakly-defined, apical lobe tube-like, markedly thicken, apical part sharp, with many pseudopores. Paramera ( Fig. 39View FIGURES 32 – 41. L) with oval paramerit, velum smaller than paramerit, apical lobe subparallel, hookshaped bent backwards, apex with about four setae and couple of pseudopores.

Spermatheca as in Fig. 40, 41View FIGURES 32 – 41. L, basal part V-shaped, apical part one half shorter but almost twice as wide as basal part, internal wall in apical part densely wrinkled.

Measurements. (Holotype), body length 5.45 mm; forebody length 2.90 mm; head length: 0.87 mm; head width: 0.75 mm; antennal length 2.50 mm; pronotal length 1.15 mm; pronotal width 1.75 mm; elytral length 1.05 mm; elytral width 1.80 mm; foretibial length 1.12 mm; midtibial length 1.40 mm; hindtibial length 1.70 mm

Differencial diagnosis. L. suensoni  can be readily separated from other species of the group by markedly broad antennomeres, shallow frontal triangular depression, by characteristic shape of metaventral process and spermatheca, apical part of middle lobe of aedeagus markedly thicken, antenomeres III–IV in males lacking setae.

Host ant. Formica lemani Bondroit, 1917 

Distribution. Japan (Honshu)


Kyushu University Entomology Collection














Lomechusoides suensoni ( Bernhauer, 1936 )

Jászay, Tomáš & Hlaváč, Peter 2013


Lomechusoides hosodai (

Hlavac 2011: 9


Lomechusa hosodai

Maruyama 2004: 112Sawada 1994: 363


Lomechusa Suensoni Bernhauer, 1936 : 323

Schilow 1981: 218Bernhauer 1936: 323