Eulichas siamensis Hájek, 2009

Hájek, Jiří, 2009, Revision of the genus Eulichas Jacobson, 1913 (Coleoptera: Eulichadidae) II. E. dudgeoni species group, Zootaxa 2192, pp. 1-44 : 20-21

Eulichas siamensis Hájek , sp. nov.

( Figs. 5 , 29 , 49 , 69 )

Eulichas dudgeoni: Jäch 1995: 373 (partim, Vietnam).

Type locality. Thailand, Nan Prov., Doi Phu Kha Nat. Park, ca. 19°13’N, 101°07’E.

Type material. 96 specimens — Holotype 3 ( NMPC), labelled: “ THAI, N, Nan prov., Doi / Phu Kha N.P., Headq., / 19°13’N, 101°07’E, 22– / 26.iv.1999, M. Říha leg. [printed]”. Paratypes: 233 (nos. 1–2), same label data, but “D. Hauck leg.” ( NMPC); 13 (no. 3), “ THAILAND / PROV. NAN, BO KHUA / 19. 4 – 7. 5. 2004 / MORAVEC PETR [printed]” ( NMPC); 13 (no. 4), “ THAILAND, Nan Prov. / Khun Nan NP / P. Viktora leg., 23.iv.2004 [printed]” ( NMPC); 233 (nos. 5–6) 1Ƥ (no. 7), “N. Thailand, / Chiang Mai, / VIII. 1996, leg. Wong Tet Fatt [printed]” ( HNHM); 13 (no. 8), “THAI-N, 1.–19.v.1998 / Chiang Mai prov., / BAN SAN PAKTIA, 1400 m, / Ivo Martinû leg. [printed]” ( NMPC); 1033 (nos. 9–18), “ LAOS north, 5–11.V.1997 / 20 km NW Lounag Namtha, / N 21°09.2, E 101°18.7; / alt. 900± 100 m, / E. Jendek & O. Šauša leg. [printed]” ( NMPC); 1033 (nos. 19–28) 2ƤƤ (nos. 29–30), “ LAOS, Louangnamtha pr. / 21°09’N 101°19’E, / Namtha ⊣Muang Sing, / 5 – 31. V. 1997, 900- / Vít Kubáň leg. - 1200 m [printed]” ( NHMW, NMPC); 13 (no. 31), “ LAOS, Louangnamtha pr., / 21°09’N 101°19’E, / Namtha ⊣Muang Sing, / 5–31.v.1997, 900– 1200m, / Vít Kubáň leg. [printed]” ( NMPC); 13 (no. 32), “LaosPDR: Luang Namtha Prov. / Nam Ha NBCA: Lakkhammai Village / Nam Leung stream, 749mao / 47Q 0 74462, UTM 2339873 / 30 IV 2005, Light trap, loc 29 / N Jönsson, T Malm & B Viklund leg. [printed]” ( NHRS); 233 (nos. 33–34), “ LAOS: Louang Phrabang prov. / 20°33.4’N 102°14’E / 5km W Ban Song Cha / ca. 1200m, 24.4.– 16.5.1999 / leg. C. Holzschuh [printed]” ( NHMW); 1133 (nos. 35–45), “LAOS-N, 24.iv.–16.v.1999, / Louang Phrabang prov., / 20°33-4’N 102°14’E, / Ban Song Cha (5km W), / ± 1200m, Vít Kubáň leg. // Vít Kubáň expedition / „ Laos 1999“ / Moravian Museum Brno / Czech Republic [printed]” ( MZMB, NMPC); 4833 (nos. 46–93) 2ƤƤ (nos. 94–95), “LAOS-N (Oudomxai) / 1–9.V.2002, ~ 1100m, / 20°45’N 102°09’E, / OUDOM XAI (17km / NEE), Vít Kubáň leg. // Entomological expedition / „ Laos 2002“ / Moravian Museum / Brno, Czech Republic [printed]” ( BMNH, MZMB, NMPC).

Additional material studied. 37 specimens — THAILAND: 13, no additional data ( SMNS); 433 1Ƥ, Chantaburi prov., Kao Soi Dao, iv. 1984, S. Steinke leg. ( MCSN, NMPC); 1933 4ƤƤ, Chiang Mai prov. Doi Pui, v.1985, S. Steinke leg. ( MCSN, NMPC); 13, same label data, but 3.vi.1985 ( SMNS); 13, Doi Ithanon, 20.v.1988, G. Minet leg. ( NHMB). VIETNAM: 13, Hoang Lien Son prov., Sa Pa, 1550 m, 11.–19.vi.1990, J. Strnad leg. ( NMPC); 233, Sa Pa (Lao Cai), 27°20’N 103°50’E, 25.v. –. 10.vi.1991, E. Jendek leg. ( NHMW); 13, Fan Si Pan Mts., Sa Pa, 1600 m, 20.iv.1995 ( BMNH); 13 1Ƥ, Mont Bavi, v.1935, S. Masseyeff leg. ( BMNH).

Description. Habitus elongate, fusiform. Body colouring from brownish-red to brown-blackish. Pale part of setation consists of recumbent yellowish setae forming indistinct ocellations on pronotum, and characteristic ocellations on elytra ( Fig. 5 ).

Measurements. Males: 23–28 mm (holotype 24 mm); females: 29–35 mm.

Head punctation consists of irregularly distributed sparse moderately large setigerous punctures. Antenna slender, last antennomere nearly rectangular, with apical elongation of variable length, 3.07–3.79 times as long as wide ( Fig. 29 ), its ventral side smooth.

Pronotum trapezoidal, ca. 1.87–2.02 times as wide as long. Sides skewed and straight in anterior half, then with obtuse angle, and prominent hind angles ( Fig. 49 ). Pronotum with two oval shallow depressions on the disc, and indistinct depressions also medially along anterior and posterior margin. Punctation consists of moderately coarse setigerous punctures, sparse on the disc, and densely distributed laterally.

Elytra with numerous longitudinal rows of moderately large punctures, and very fine interstitial setigerous punctures.

Ventral part with fine punctures, which are sparse medially and become larger and denser laterally. Last abdominal ventrite laterally usually with more or less distinct sinuation before apex.

Male. Aedeagus with phallobase shorter than parameres. Parameres simple, moderately broad, their inner side attenuating sinuously to subapical hook. Parameral subbasal hook small, but the subapical hook is well developed, very slightly prominent. Median lobe slender, subparallel ( Fig. 69 ).

Female. Similar to male in habitus, but larger. Antenna shorter, and more slender.

Remarks. Some specimens from northern Thailand (Chiang Mai) display slight variability in aedeagal characters – they have parameres with ventral side almost straight, and median lobe slender than in typical specimens. Although I believe, that it is only intraspecific variability, I do not designate those specimens as paratypes. On the other hand, specimens from Sa Pa ( Vietnam) were already introduced in Jäch (1995) as E. dudgeoni . Although they agree well with E. siamensis sp. nov. in habitus, shape of pronotum and last antennomere, they have parameres slightly slender than typical specimens, with their apical part more elongate, and subapical parameral hook more prominent – in these characters, they indeed resemble E. dudgeoni . They may represent a separate taxon, however, as only four specimens are known, I leave them within E. siamensis sp. nov., until more material is available.

Differential diagnosis. Eulichas siamensis sp. nov. is similar to E. jendeki and E. similis sp. nov. in habitus. It differs from both of them in the longer last antennomere and more prominent hind angles of the pronotum. In addition, it differs from E. jendeki in the sinuous ventral parameral side, and from E. similis sp. nov. in the slender and subparallel median lobe of the aedeagus.

Collection circumstances. Collected at light.

Distribution. A species ranging in the upland area of northern Thailand, Laos and Vietnam.

Etymology. The name is derived from “ Siam ”, an ancient kingdom spreading in the territory of recent Thailand.

Figures

FIGURES 1 – 12. Habitus of Eulichas. 1 — E. alesbezdeki sp. nov. (holotype); 2 — E. bertiae (paratype, Suisapa); 3 — E. dudgeoni (paratype, Hong Kong); 4 — E. jendeki (Sa Pa); 5 — E. siamensis sp. nov. (paratype, Ban Bo Klua); 6 — E. similis sp. nov. (paratype, Soppong); 7 — E. uniformis (Dolakha); 8 — E. baeri (Luzon); 9 — E. baeri (Crocker Range); 10 — E. gigantea (holotype); 11 — E. incisicollis ♂ (Tanah Rata); 12 — E. incisicollis Ƥ (holotype).

FIGURES 25 – 44. Male antennomeres IX – XI of Eulichas. 25 — E. alesbezdeki sp. nov.; 26 — E. bertiae; 27 — E. dudgeoni; 28 — E. jendeki; 29 — E. siamensis sp. nov.; 30 — E. similis sp. nov.; 31 — E. uniformis; 32 — E. baeri; 33 — E. incisicollis; 34 — E. oborili sp. nov.; 35 — E. robusta sp. nov.; 36 — E. sausai sp. nov.; 37 — E. serricornis sp. nov.; 38 — E. sikkimensis; 39 — E. sundaensis sp. nov.; 40 — E. wewalkai sp. nov.; 41 — E. fasciolata; 42 — E. jakli sp. nov.; 43 — E. subocellata; 44 — E. villosa sp. nov. Scale bar 1 mm.

FIGURES 45 – 54. Pronotum of Eulichas. 45 — E. alesbezdeki sp. nov.; 46 — E. bertiae; 47 — E. dudgeoni; 48 — E. jendeki; 49 — E. siamensis sp. nov.; 50 — E. similis sp. nov.; 51 — E. uniformis; 52 — E. baeri (Luzon); 53 — E. incisicollis; 54 — E. oborili sp. nov. Not in Scale.

FIGURES 65 – 71. Aedeagus of Eulichas in dorsal view. 65 — E. alesbezdeki sp. nov.; 66 — E. bertiae; 67 — E. dudgeoni; 68 — E. jendeki; 69 — E. siamensis sp. nov.; 70 — E. similis sp. nov.; 71 — E. uniformis. Scale bar 1 mm.