Himalcercyon mirus (Hebauer, 2002) Jia & Liang & Fikáček, 2020

Jia, Fenglong, Liang, Zulong & Fikacek, Martin, 2020, A review of Himalcercyon stat. nov., with description of a new species from the Chinese Himalaya and an updated key to Asian genera of Megasternini (Coleoptera, Hydrophilidae), Deutsche Entomologische Zeitschrift 67 (1), pp. 35-49 : 35

publication ID	https://dx.doi.org/10.3897/dez.67.50078
publication LSID	lsid:zoobank.org:pub:56BB973D-BE4E-47AE-BC98-C1F1151C41C4
persistent identifier	https://treatment.plazi.org/id/38BC7AF3-1E3C-5723-A29D-6DEC897FECCB
treatment provided by	Deutsche Entomologische Zeitschrift by Pensoft
scientific name	Himalcercyon mirus (Hebauer, 2002)
status	stat. nov.

Treatment

Himalcercyon mirus (Hebauer, 2002) stat. nov. Figures 1A-D View Figure 1 , 2 View Figure 2 , 4 View Figure 4

Cercyon (Himalcercyon) mirus Hebauer 2002: 39.

Type locality.

Nepal, Kathmandu district, Sheopuri Mt., 2100-2300 m a.s.l. [GPS ca 27.816672N, 85.400000E].

Material examined.

Holotype: NEPAL ● 1 ♂; Kathmandu Distr. Sheopuri Mt.; 2100-2300 m a.s.l.; 25 Jun 1988; W. Schawaller leg.; SMNS.

Paratypes: NEPAL ● 2 ♀♀; same data as for holotype; SMNS ● 1 ♀; same data as for holotype; NMPC ● 1 ♀; Annapurna, Telbrung Danda; 2600-2800 m a.s.l.; 13 Jun 1997; Schmidt leg.; SMNS.

Redescription.

Form and color. Body size 3.1-3.5 mm (3.4 mm in holotype), body width 2.0-2.1 mm (2.0 mm in holotype), widest at anterior third of elytra, weakly narrowing posteriad (Fig. 1A View Figure 1 ). Dorsum pitchy-brown to black; head with paler clypeus; pronotal margins brown; elytral apices and posterior half of lateral elytral margins brownish; epipleuron pitchy brown laterally, reddish mesally; antenna, maxillary and labial palpi brown to reddish brown; legs reddish brown, with darker femora.

Head. Clypeus with moderately dense fine setiferous semicircular punctures, smooth between punctures. Frons with punctures of the same size and density as those on clypeus, smooth between punctures. Mentum 1.4 × wider than long, rugose, with dense punctures (Fig. 2B View Figure 2 ), slightly concave anteriorly. Antenna with pedicel ca 0.2 × as long as scape, pedicel ca. as long as antennomeres 3 and 4 combined, cupule small.

Thorax. Pronotum with punctation similar to that on frons, interstices without microsculpture; lateral marginal bead shortly overlapping to anterior margin but not to posterior margin, stopping at posterior angle. Scutellar shield smooth, with five to seven punctures. Elytral striae sharply impressed (Fig. 1A View Figure 1 ), striae 6, 8, and 9 not reaching base; intervals with finer and sparser punctures than on pronotum, each puncture bearing a fine short seta, interstices between punctures smooth. Epipleuron with bare outer and pubescent inner portion delimited from each other by a fine ridge, inner pubescent part narrower than the outer part, reaching the level of posterior part of metaventrite (Fig. 1A View Figure 1 ). Mesoventral elevation arrowhead-shaped, ca 1.5 × longer than wide, sparsely pubescent (Fig. 2F View Figure 2 ). Metaventrite with large median elevation, finely and sparsely punctate (Fig. 2E View Figure 2 ), interstices without microsculpture; lateral portions microsculptured, with sparse coarse punctures and dense pubescence. Legs with trochanters densely pubescent, femora with sparse and moderately coarse punctures, interstice between punctures with fine microsculpture consisting of transverse lines.

Male genitalia. Middle lobe of abdominal sternite IX narrow, shorter than lateral struts (Fig. 1D View Figure 1 ). Aedeagus (Fig. 1C View Figure 1 ) with median lobe ca as long as tegmen; paramere ca 1.5 × as long as phallobase. Paramere gradually narrowed from base to apex, obliquely truncate apically, widened inwards to form a process with a few setae. Median lobe ca as wide as paramere, gradually narrowing in apical third, apex narrowly rounded, gonopore subapical.

Distribution.

Known from two localities in central Nepal (Fig. 4 View Figure 4 ).

Key to Eastern Palaearctic and Oriental genera of the Megasternini

The following key is mainly based in the ventral characters, namely the form of prosternum and meso- and metaventrite, which are illustrated in Figures 5 View Figure 5 - 8 View Figure 8 . The concept of some of the genera will likely be modified in the future; the key reflects the current status. The key includes all genera occurring east of Iran, the Black Sea, and the Ural Mountains. (i.e. it does not cover the Near East and the Arabian Peninsula); eastwards it includes all regions west of New Guinea. See Table 1 View Table 1 for the number of described species and references to the most important keys or taxonomic treatments for each genus. Remarks and numbers of species only refer to those from the Eastern Palaeartic and Oriental Regions.

New replacement name