Dryopomorphus pekariki, Čiampor, Fedor, Čiamporová-Zaťovičová, Zuzana & Kodada, Ján, 2012

Čiampor, Fedor, Čiamporová-Zaťovičová, Zuzana & Kodada, Ján, 2012, Malaysian species of Dryopomorphus Hinton, 1936 (Insecta: Coleoptera: Elmidae), Zootaxa 3564, pp. 1-16 : 4-6

Dryopomorphus pekariki n.sp.

Figs. 4 , 17–20 , 38, 39

Type locality: Malaysia, Sabah, Sabalangang river (ca 25km SE from Sapulut). Lowland stream surrounded by remnants of primary forest. The stream is 5–7 m wide, with gravel, large boulders and submerged logs.

Type material: holotype male ( NMW): ” Malaysia, Sabah, ca. 25km SE Sapulut, Sabalangang river, 21.5.2001, J.F. Kočiam lgt.”, paratypes ( CCB): 1 female “ Malaysia, Sabah, ca. 25km SE Sapulut, Sabalangang river, 21.5.2001, J.F. Kočiam lgt.”, 1 male “ Malaysia, Sabah, Sabalangang river in primary forest, ca. 25km SE Sapulut, 26.6.1998, J. Kodada & F. Čiampor Lgt.”

Diagnosis: smaller body size, elongate; color reddish brown; outline not constricted between pronotum and elytra; strial punctures relatively coarser, less impressed; elytral intervals flat; pronotum with fine shiny median longitudinal line in anterior half; lateral pronotal margins distinctly explanate; scutellum as long as wide; median lobe thin, with simple rounded apex; phallobasis widened posteriad.

Description. Body elongate, smaller (CL: 2.95 mm), 2.18–2.19 times as long as wide (CL/EW), convex dorsally ( Fig. 4 ); dorsal surface with very dense short adpressed yellowish setae and sparser longer semierect setae. Coloration of head black, pronotum, elytra, legs and antennae reddish brown.

Head partly retractable into thorax. Labrum short, partly concealed by clypeus, densely setose, with lateral angles rounded; clypeus longer and wider than labrum, about twice as wide as long, densely setose; frontoclypeal suture visible, straight; surface of clypeus and labrum densely punctured, coarse. Eyes large, slightly protruding from head outline, subtriangular in lateral view, ID: 0.40–0.45 mm; surface not raised near dorsal margin of eyes; frons and vertex irregularly densely punctured, interstices shiny, punctures setose.

Thorax. Pronotum widest at base, nearly as wide as elytral base, PW: 1.15–1.25 mm, PL: 0.73–0.76 mm; disc convex, punctures well impressed, separated by puncture diameter, interstices shiny; lateral margins explanate, converging anteriad in nearly straight line up to strongly arcuate anterior corners; sublateral basal sulci moderately converging anteriad, shallow, present ca. along posterior 0.2 of pronotum; hypomeron subparallel, slightly narrowed posteriad, anteriorly more than three times as wide as protibia, anterior depression well developed, surface rough, with moderately dense longer setae. Prosternal process ca. 1.6 times as long as prosternum in front of coxae, lateral margins raised, posterior margin distinctly produced medially, surface of prosternum subglabrous with denser small and sparser larger setae. Mesoventrite short, widest in middle, markedly constricted between pro- and mesocoxae; mesoventral cavity deep. Metaventrite impressed anteriorly between coxae; discrimen thin, present from anterior depression to posterior margin; disc flat, with larger punctures, row of deep punctures anteriorly to each metacoxa, surface structure as on prosternum. Elytra 2.15–2.30 mm long (EL), 1.32–1.42 mm wide (EW); disc convex, densely pubescent; sides gradually arcuately converging posteriad, narrowly explanate; anterolateral corners rounded; humerus feebly prominent; epipleuron widest anteriorly, slightly inflected at level of metacoxa, narrowed posteriad, with distinct anterior transverse carina. Each elytron with ten striae; punctures in anterior part and in admesal striae smaller, in lateral striae larger and more distinct, striae not impressed; intervals flat, with dense micropunctation. Scutellum as long as wide, sides arcuate. Legs relatively short, not modified, hind tibiae longest, mid tibiae shortest.

Abdomen. Intercoxal process of first ventrite triangular, longer than wide, lateral margins raised continuously into carinae reaching posterior margin of ventrite, apex subacute; admesal cavities short, oblique; lateral portion of ventrites I–III with larger punctures; punctures of ventrite IV–V smaller; posterolateral angles of ventrite I–IV protruding posteriad; apex of ventrite V rounded. Ninth segment with spiculum gastrale as in Fig. 20 . Aedeagus ( Figs. 17–19 ): in ventral/dorsal view phallobase wide, without basal process; parameres subequal in length with phallobase, wide, widest in basal 0.25, moderately narrowed toward subrounded apex; median lobe slightly longer than parameres, narrow, slightly widened in apical 0.3, apex round; fibula indistinct; ventral sac robust, finely sculptured in apical portion; in lateral view parameres abruptly curved apically, median lobe very narrow, sinuate. Ovipositor ( Figs. 38, 39 ) with terminal segment short, cylindrical, bearing several types of sensilla; preterminal segment elongate, 8.1 times as long as terminal segment, with pair of distinct sensilla; basal segment ca. 1.1 times as long as preterminal and distal segments combined, fulcrum ventrale feebly sinuate.

Distribution. So far known only from the type locality.

Etymology. This species is dedicated to Ladislav Pekárik, our friend and colleague.

Figures

FIGURES 1 – 4. Habitus of Dryopomorphus species from Malaysia: 1) D. bishopi Hinton, 1971; 2) D. hendrichi Čiampor Jr & Kodada, 2006; 3) D. satoi Spangler, 1985; 4) D. pekariki n. sp. (holotype) Scale bar: 1 mm.

FIGURES 17 – 20. Dryopomorphus pekariki n. sp. (holotype): 17) aedeagus ventral view; 18) aedeagus dorsal view; 19) aedeagus lateral view; 20) segment 9 and spiculum gastrale. Scale bar: 0.1 mm.

FIGURES 34 – 40. 34 – 39, Ovipositors: 34) D. bishopi Hinton, 1971; 35) same, detail of terminal segment; 36) D. satoi Spangler, 1985; 37) same, detail of terminal segment; 38) D. pekariki sp. nov.; 39) same, detail of terminal segment; 40) segment 9 and spiculum gastrale of D. grandis n. sp. Scale bar: 0.1 mm.