Horaeomorphus solodovnikovi, Jałoszyński, 2014

Jałoszyński, Paweł, 2014, Oriental Horaeomorphus Schaufuss: a new species, synonymic notes and distributional synopsis (Coleoptera: Staphylinidae: Scydmaeninae), Raffles Bulletin of Zoology 62, pp. 83-88 : 83-85

Horaeomorphus solodovnikovi , new species

( Figs. 1 A–C, 2A, B)

Material examined. Holotype. Male ( Fig. 1A ), three labels: “ LAOS: Champasak prov.: / Bolaven Plt. [i.e., Plateau], Muang Paxong ,

/ Ban Hoyayteuy , Mt. Phu Din / 14-14.vi.2008; 1,100 m., / N 15°03.171' E 106°17.397' ” [white, printed], “ A. Solodovnikov & J. / Pedersen leg. Disturbed / primary rainforest. / ZMUC collection.” [white, printed], “ HORAEOMORPHUS / solodovnikovi m. / det. P. JAŁOSZYŃSKI, 2013 / HOLOTYPUS ” [red, printed] ( ZMUC) .

Diagnosis. The following set of characters is unique for this species: body length below 3 mm, pigmentation brown, pronotum strongly elongate, with three small ante-basal pits located in deep groove; metatrochanters in males strongly modified, each forming very long, slightly recurved rod-like projection with rounded apex; and aedeagus with symmetrical internal armature containing long median tubular structure much longer than half length of median lobe.

Male. Body ( Fig. 1A ) moderately large (length 2.75 mm), slender, strongly convex, dark brown with slightly lighter legs and palps, vestiture slightly lighter than cuticle.

Head broadest at moderately large and moderately strongly convex eyes, length 0.40 mm, width 0.60 mm; tempora rounded and about as long as eye in dorsal view; vertex strongly transverse and weakly convex, with pair of small but distinct pits located near posterior margins of supraantennal tubercles; frons weakly convex; supraantennal tubercles strongly raised, well delimited from frons but confluent with vertex. Punctures on vertex and frons fine and inconspicuous; setae moderately long, sparse, suberect to erect. Antennae slender, longer than half length of body, length 1.50 mm; relative lengths of antennomeres (shortest antennomere II as 1): 1.43: 1.00: 1.71: 1.29: 1.29: 1.14: 1.14: 1.14: 1.43: 1.43: 2.00.

Pronotum oval, elongate, broadest between anterior third and fourth, length 0.85 mm, width at base 0.50 mm, maximum width 0.73 mm; distal part strongly narrowing caudad to moderately sharply marked posterior constriction demarcating narrow basal collar; hind angles obtuse and blunt; posterior margin nearly straight; posterior collar delimited from disc by deep, narrow and slightly convex anteriorly transverse groove connecting three small pits: median pit as small as width of groove and lateral pits only slightly larger. Punctures on disc as fine as those on frons and vertex; vestiture composed of sparse, moderately long and suberect setae.

Elytra strongly elongate, oval, more convex than pronotum, broadest between middle and anterior third, length 1.50 mm, width 0.98 mm, elytral index 1.54. Humeral calli weakly marked, delimited from adsutural region by very short, shallow and broad basal impressions; basal elytral foveae indiscernible; median part of elytra without adsutural or circumsutural impressions; apices of elytra separately rounded. Punctures more distinct than those on pronotum, fine but sharply marked and separated by spaces 2–3× as wide as puncture diameters; vestiture similar to that on pronotum but slightly longer.

Metatrochanters ( Fig. 1B ) strongly modified, developed as long and recurved rod-like projections nearly as long as half of metafemur.

Aedeagus ( Figs. 1C , 2A, B ) 0.73 mm in length; median lobe broadest in basal third, distal part subtriangular and rounded at apex, in lateral view slightly curved dorsally; internal armature remarkable, with large and symmetrical central complex containing strongly elongate tubular structure in middle; parameres slender, each with apical bunch of several setae of various lengths, without subapical setae.

Female. Unknown.

Etymology. This species is dedicated to Alexey Solodovnikov (ZMUC), a specialist on Staphylinidae and one of collectors of the specimen fixed here as a holotype.

Distribution. Southern Laos, Champasak Province.

Remarks. Horaeomorphus solodovnikovi shares the highly modified and recurved male metatrochanters with several congeners: H. antennatus Jałoszyński, 2006 (from Malaysia: Pahang), H. caverniventris Jałoszyński, 2006 ( Malaysia: Pahang), H. punctatissimus Franz, 1992 ( Malaysia: Sabah; Indonesia: Sumatra, Siberut Is.), H. jeraianus Jałoszyński, 2006 ( Malaysia: Kedah), H. punctifrons Jałoszyński, 2006 ( Malaysia: Pahang), H. jaechi Jałoszyński, 2006 ( Malaysia: Sarawak), H. tiomanensis Jałoszyński, 2006 ( Malaysia: Tioman Is.), H. endauensis Jałoszyński & Nomura, 2007 ( Malaysia: Pahang), H. imitator Jałoszyński, 2009 ( Philippines: Mindanao), H. blattnyi Jałoszyński, 2004 ( Philippines: Luzon), H. sakishimanus Jałoszyński, 2002 ( Japan: Iriomote-jima and Ishigaki-jima islands), and H. calcarifer ( Franz, 1986) ( Fiji) . None of these species has the aedeagus with a long tubular median part of the internal armature, and this character allows for an unambiguous identification of H. solodovnikovi .

Figures

Fig. 1. Horaeomorphus solodovnikovi, new species, (A–C); and Horaeomorphus wailimae (Lhoste), new combination, (D–G). Dorsal habitus of holotype male (A), lectotype male (D; arrow indicates femoral projection) and paralectotype female (E); right metatrochanter and femur in ventral view (B; arrow indicates the apex of trochanteral projection); internal armature of aedeagus in ventral view (C; arrow indicates median tubular structure); genital preparation of lectotype male (F); and original set of labels of lectotype male (G). Scale bars = 0.5 mm (A, D, E), 0.1 mm (B), 0.2 mm (C).

Fig. 2. Horaeomorphus solodovnikovi new species. Aedeagus in ventral (A) and lateral (B) views. Scale bar = 0.2 mm.