Diamella barsevskisi, Anichtchenko, 2016

Anichtchenko, Alexander, 2016, A new species of Diamella Shi & Liang, 2013 from the Philippines (Coleoptera: Carabidae: Lebiini), Baltic Journal of Coleopterology 16 (2), pp. 105-108 : 106-108

Diamella barsevskisi new species

( Figs. 1-2 )

Types. Holotype, male: “ Philippines, Mindanao, Kiamba , Sarangani, Jul. 2016 ” ( DUBC).

Diagnosis New species is most similar to D. arrowi in possessing shallow elytral striae and bluish reflections on the elytra, but can be easily distinguished by the moderately tumid vertex, absence of horn-like humps at posterior supra-orbital seta insertions; pronotum front angles not narrowed, lateral margins completely rounded medially; elytra dark blue, strongly metallic; elytra with very shallow striae, with accessory setae only on odd intervals.

Description Body length 6 mm; head and pronotum reddish brown, shiny; elytra metallic blue, with diffused reddish brown sutural spot on 1-4 intervals and lateral margins; mouthparts, 3 basal antennomeres and legs yellowish; ventral side dark brown.

Head without microsculpture or punctures, sparsely pubescent on vertex and lateral impressions; tempora shorter than half length of eyes; vertex moderately tumid, posterior supra-orbital setae remote from eyes, setal insertions humped; labrum parallel sided, apical border emarginate.

Pronotum broadly transverse, widest in the middle; ratio PW/PL 1.7; front angles broadly rounded; lateral margins strongly expanded in middle, completely rounded, sinuate before hind angles; hind angles acute, clearly projected; disc slightly convex, shiny, microsculpture indistinct; lateral explanate areas wide and even; basal foveae shallow; disc sparsely punctate, base and lateral sides moderately punctate; disc with long setae; median line distinct, shallow.

Elytra wide, ratio EW/EL 1.25; hind-wings well developed; elytral lateral borders wide; striae shallow, finely punctate, not reaching basal margin; discal pores indistinct, except pre-apical ones, situated near second stria; intervals flat, devoid of microsculpture, odd intervals with secondary pores, more abundant on 5 th and 7 th intervals; primary pores indistinct among secondary pores; umbilical series of 9 th interval composed of 18 pores; disc without distinct depression; elytral lateral margins with sparse and fine setae; epipleura glabrous.

Ventral side Propleura smooth; prosternum with long pubescence, pro-episterna glabrous; mesosternum nearly glabrous; abdomen pubescent. Male genitalia with median lobe of aedeagus flat and almost straight, gently expanded to apex; dorsal side slightly pubescent sub-apically; apical orifice opened apically; lamella placed on right side, short and rounded; internal sac with main flagellum long and narrow, reaching apical orifice; trumpet-form expansion poorly discernible ( Fig. 2 ).

Female genitalia unknown.

Distribution Known only from type locality, Mindanao ( Philippines).

Etymology The species is named after my collegue, professor, Dr. Arvid Barševskis (Daugavpils, Latvia), in respect of his great contribution to the study of Coleoptera of the Philippines.

Figures

Figs. 1-2. Habitus (A) and aedeagus (B) of Diamella barsevskisi, new species.