Dryopomorphus sarawacensis, 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 : 12-13

Dryopomorphus sarawacensis n.sp.

Figs. 7 , 27–30 , 45, 46

Type locality: Malaysia, Borneo, Sarawak, Rumah Ugap stream—lowland stream surrounded by dense primary dipterocarp forest. The stream is 2–3 m broad and up to 60 cm deep, with gloomy water (probably due to erosion in upstream areas).

Type material: holotype male ( NMW): ” SARAWAK (Borneo), ca. 40km SE KAPIT, 0 3.1994, J. Kodada leg. / Rumah Ugap, stream in dense primary dipterocarp forest”, paratypes ( CCB, CKB, NMW): 13 exs. ” SARAWAK (Borneo), ca. 40km SE KAPIT, 0 3.1994, J. Kodada leg. / Rumah Ugap, stream in dense primary dipterocarp forest”, 38 exs. ” SARAWAK (Borneo), ca. 40km SE KAPIT, 0 3.1994, J. Kodada leg.”, 31 exs. ” SARAWAK (Borneo), ca. 40km SE KAPIT, 3.1994, J. Kodada leg.”, 50 exs. ” SARAWAK (Borneo), ca. 25km E KAPIT, III.1994, Kodada leg.”, 3exs. ”MAL., Sarawak 1993, 40km S Kuching, 17.2., Baan Gong Sikog Wasserf [waterfall] leg. M. Jäch (3)”, 1ex. ”MAL., Sarawak 1993, 80km S Kuching, 18.2., Kampung Aná Rais leg. M. Jäch (4)”.

Diagnosis: body form elongate; smaller species; pronotum with indistinct median longitudinal line; femora reddish-brown; parameres irregularly shaped in apical half; median lobe with knife-shaped apex.

Description. Body elongate, size smaller, CL: 2.82–3.09 mm, 2.17–2.36 times as long as wide (CL/EW), convex dorsally ( Fig. 7 ); body outline subparallel; dorsal surface with very dense short adpressed yellowish setae and sparser longer semierect setae. Coloration of head black, pronotum, elytra, tibiae dark brown, femora, tarsi, antennae and lateral margins of elytra reddish brown.

Head partly retractable into thorax. Labrum shorter than wide, ca. as long as clypeus, partly concealed by clypeus, densely setose, lateral angles rounded with brush of long curved yellowish setae; 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. Eyes large, slightly protruding from head outline, subtriangular in lateral view, ID: 0.38–0.48 mm; surface not raised near dorsal margin of eyes; frons and vertex irregularly densely punctured, interstices shiny, punctures setose.

Thorax. Pronotum widest in basal third, PW: 1.05–1.18 mm, PL: 0.65–0.80 mm; disc convex, punctures well impressed, on sides separated by their diameter with interstices shiny, on disc denser; lateral margins distinctly explanate, in anterior 0.6 converging in nearly straight line toward subacute produced anterior angles; hypomeron subparallel, narrowed posteriad, anteriorly about three times as wide as protibia, anterior depression shallow, surface rough, with moderately dense long hairs, anterior depression microreticulate. Sublateral basal sulci shallow, straight, present ca. along posterior 0.35 of pronotum. 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 rugose with denser small and sparser longer setae. Mesoventrite short, widest in middle, markedly constricted between coxae, mesoventral cavity deep. Metaventrite impressed anteriorly between coxae; discrimen thin, present from anterior depression to posterior margin; disc flat, lateral sides with larger punctures, with row of deep partly fused punctures before each metacoxa, surface as on prosternum. Elytra 2.17–2.45 mm long (EL), 1.27–1.41 mm wide (EW); disc convex, densely pubescent; sides parallel in anterior half, then gradually arcuately converging posteriad, narrowly explanate; anterolateral corners rounded; humeri feebly prominent; epipleuron widest anteriorly, slightly inflected at level of metacoxa, narrowed posteriad, with distinct anterior transverse carina. Each elytron with ten striae; strial punctures in anterior part and in admesal rows smaller, in lateral rows larger and more distinct, striae not impressed; intervals not convex, 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 without larger punctures; posterolateral angles of ventrite III–IV protruding posteriad; apex of ventrite V rounded.

Ninth segment with spiculum gastrale as in Fig. 30 . Aedeagus ( Figs. 27–29 ): in ventral/dorsal view phallobase wide, subparallel, widest in middle, without basal process, only with moderate basal projection; parameres ca. 1.25 times longer than phallobase, unevenly shaped; median lobe slightly longer than parameres, widened toward base; fibula indistinct; ventral sac robust, finely sculptured in apical portion; in lateral view parameres finely curved apically, median lobe very narrow, sinuate, apex with distinct keel on dorsal side (knife-shaped). Ovipositor ( Figs. 45, 46 ) slender, with terminal segment short, cylindrical, bearing several types of sensilla; preterminal segment distinctly elongate 10.6 times as long as terminal segment, with pair of distinct sensilla; basal segment subequal in length with preterminal and distal segments combined, fulcrum ventrale feebly curved.

Distribution. So far known only from the type locality.

Etymology. This species is named after the Malaysian state of Sarawak, where it was collected.

Figures

FIGURES 5 – 8. Habitus of Dryopomorphus species from Malaysia: 5) D. grandis n. sp. (holotype); 6) D. jaechi n. sp. (holotype); 7) D. sarawacensis n. sp. (holotype); 8) D. memei n. sp. (holotype) Scale bar: 1 mm.

FIGURES 27 – 30. Dryopomorphus sarawacensis n. sp. (holotype): 27) aedeagus ventral view; 28) aedeagus dorsal view; 29) aedeagus lateral view; 30) segment 9 and spiculum gastrale. Scale bar: 0.1 mm.

FIGURES 41 – 48. Ovipositors: 41) D. grandis n. sp.; 42) same, detail of terminal segment; 43) D. jaechi n. sp.; 44) same, detail of terminal segment; 45) D. sarawacensis n. sp.; 46) same, detail of terminal segment; 47) D. memei n. sp.; 48) same, detail of terminal segment. Scale bar: 0.1 mm.