Dyschiriodes (Paradyschirius) hajeki, Bulirsch, 2009

Bulirsch, Petr, 2009, Contribution to the Asian and Afrotropical species of the genus Dyschiriodes (Coleoptera: Carabidae: Scaritinae), Acta Entomologica Musei Nationalis Pragae (suppl.) 49 (2), pp. 559-576 : 562-565

Dyschiriodes (Paradyschirius) hajeki sp. nov.

( Fig. 2 )

Type locality. China, Yunnan province, S of Haba, Haba Xueshan Mountains , 2830–3000 m a.s.l., 27°22.1′N; 100°08.2′E .

Type material. HOLOTYPE: ♀, ‘ CHINA, YUNNAN prov., 1.3–2.0 / km S of Haba, 17.–20.vi.2007 / Haba Xueshan Mts. , 2830– / 3000m, 27°22.1’N 100°08.2’E, / J. Hájek & J. Růžička leg. // individually collected on soil / surface and on plants and / shrubs, sparse mixed forest / (with dominant Pinus ), / in-near the brook’ ( NMPC).

Description. Habitus as in Fig. 2 ; length 3.75 mm. Colour dark fuliginous, surface with slight green-bronze metallic lustre; anterior part of head, pronotum along anterior and posterior margins and elytral base ferrugineous; each elytron with indistinct, large latero-apical yellowish spot, interval 1 and apex darker; legs rusty red, basal antennomeres and mouth-parts slightly lighter; epipleura in anterior third, head and pronotum ventrally ferrugineous; sternites ventrally with indistinct, slightly lighter latero-apical spots.

Head. Anterior margin of clypeus with rounded, strongly protruded lateral lobes, between them with two paramedian, small and very blunt teeth, clypeofrontal area in anterior part with rough, irregular rugosity, bordered anteriorly by blunt and irregular keel and posteriorly (i.e., at the level of middle of eyes) by irregular, very broadly V-shaped ridge; posterior part of head strongly vaulted, with rough and dense punctures; facial furrows moderately divergent in its posterior half, distance between them larger than eye length. Vertex less vaulted, shiny, with sparse micropunctures, separated from roughly punctate area by superficial, broad furrow. Eyes relatively small and moderately convex. Antennae submoniliform.

Pronotum. Strongly convex, outline regularly, strongly rounded; slightly attenuated anteriorly; 1.00 times as wide as long, 1.44 times as wide as head; widest in posterior third. Anterior angles blunt, posterior ones moderately rounded. Anterior transverse impression distinct with rough, broad and sparse cross striae; median line very broadly and very deeply impressed in anterior sixth, then abruptly finer on disc and slightly deeper posteriorly; lateral channel moderately broad, reflexed lateral margin extended slightly beyond posterior setiferous puncture. Surface mirror-like, shiny, with very fine micropunctures.

Elytra. Strongly convex, subparallel, 2.00 times as long as wide, 1.13 times as wide as pronotum; humeri moderately protruding, without humeral teeth; base distinctly sloping; outline in basal half very slightly broadened on sides, broadest slightly below anterior third, long attenuated towards apex and very slightly towards humeri; suture not depressed at base. Base without basal border and tubercles; BSP distinctly connected with stria 1. Stria 1 deep and complete; striae 2–8 gradually finer, striae 2–3 deep on disc, 4–5 finer, 6–7 much finer and irregularly impressed; stria 8 very fine, recognisable in its middle third as a row of very fine punctures. Striae 1–7 finely and irregularly punctate in basal third. Striae 2–3 (or rarely 2–4) and 6–8 nearly obsolete at base, stria 5 slightly deeper; all striae disappearing in apical third; apex with barely recognisable traces of striae. Interval 1 raised and convex on disc, other intervals slightly raised. Three PHSP, two DSP (anterior and posterior one in/near stria 3, middle one missing) and two ASP (in moderately deep apical stria).

Protibia. Apical spine moderately curved backwards but not inwards, as long as apical spur, the latter slightly curved; distal marginal tooth large, not sharp, proximal one small, very blunt.

Differential diagnosis. Dyschiriodes hajeki sp. nov. belongs to the D. substriatus group (sensu FEDORENKO 1996, 1997a) and can be placed in the D. substriatus subgroup. It can be distinguished from the most similar D. (Paradyschirius) pfefferi ( Kult, 1949) by a larger body (3.75 mm in D. hajeki sp. nov., 3.40 mm in D. pfefferi ), two very blunt but distinct paramedian teeth on the anterior margin of clypeus (indistinct in D. pfefferi ), different structure of clypeus and vertex (T-shaped carina on clypeus and impunctate vertex in D. pfefferi ), two DSP (a single anterior DSP in D. pfefferi ) and basally deep stria 1 that is connected with BSP (stria 1 basally obsolete in D. pfefferi ). The new species differs from D. (P.) kabakovi Fedorenko, 1997 by a sparsely and much more finely punctate vertex, less rounded outline of the pronotum, apically strongly weakened elytral striae, basally much deeper stria 1, three PHSP (one PHSP in D. kabakovi ) and missing middle DSP (anterior DSP missing in D. kabakovi ). Finally, some characters in D. hajeki sp. nov. (such as the shape of the elytra) resemble D. sjoestedti (Müller, 1936) from Sichuan, the only species of this group uknown to me; D. hajeki sp. nov. can be distinguished from the latter species by its much larger size (3.75 mm in D. hajeki sp. nov., 3.00 mm in D. sjoestedti ), different colouration, structure of clypeus (clypeus almost smooth in D. sjoestedti ), basally deeper elytral stria 1 and different number of PHSP (two in D. sjoestedti ) and DSP (three in D. sjoestedti ).

Etymology. Dedicated to its collector, Jiří Hájek (NMPC, Praha), a specialist in Dytiscidae .

Distribution. China (Yunnan).

Figures

Figs. 1–5. Habitus of holotypes. 1 – Dyschiriodes sabahensis sp. nov. (3.15 mm); 2 – D. hajeki sp. nov. (3.75 mm); 3 – D. ruthmuellerae sp. nov. (3.70 mm); 4 – D. kadleci sp. nov. (3.45 mm); 5 – D. facchinii sp. nov. (3.70 mm).