Dryopomorphus jaechi, 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 : 9-11

Dryopomorphus jaechi n.sp.

Figs. 6 , 24–26 , 43, 44

Type locality: Malaysia, Sarawak, Baan Gong Sikog waterfall

Type material: holotype male ( NMW): ”MAL., Sarawak, 1993, 40km S Kuching, 17.2., Baan Gong Sikog Wasserf., leg. M. Jäch (3)”, paratypes ( CCB, CKB, NMW): 2 males, 1 female: ”MAL., Sarawak, 1993, 40km S Kuching, 17.2., Baan Gong Sikog Wasserf., leg. M. Jäch (3)”, 1 female: ”MAL., Sarawak, 1993, 80km S Kuching, 18.2., Kampung Ana Rais., leg. M. Jäch (4)”.

Diagnosis: body elongate; coloration dark, almost black; pronotum without median longitudinal line; pronotum with larger punctures; parameres elongate, very thin in apical half; phallobasis distinctly short.

Description. Body elongate, larger species (CL: 4.00– 4.30 mm), 2.17–2.25 times as long as wide (CL/EW), convex dorsally ( Fig. 6 ); dorsal surface with dense short pale setae and sparser longer semierect setae. Coloration of head, pronotum, elytra, femora and tibiae dark almost black; tarsi, antennae and anterior angles of pronotum brown.

Head partly retractable into thorax. Labrum shorter than wide, about as long as clypeus, partly concealed by clypeus, densely setose, lateral angles rounded with brush of long curved yellowish setae, anterior margin straight; clypeus longer and wider than labrum, about twice as wide as long, densely setose; frontoclypeal suture visible, straight; surface of clypeus and labrum punctured, interstices shiny. Eyes large, slightly protruding from head outline, suboval in lateral view, ID: 0.49–0.51 mm; surface not raised near dorsal margin of eyes; frons and vertex irregularly densely punctured, interstices shiny, punctures setose.

Thorax. Pronotum widest before basal third, PW: 1.37–1.49 mm, PL: 0.93–0.98 mm; disc convex, with larger setigerous punctures separated by 1–2 times puncture diameter; sides convex, slightly explanate, anterior angles more explanate than sides, produced, rounded; hypomeron subparallel, anteriorly about three times as wide as protibia, anterior depression well impressed, surface rough, densely setose. Sublateral basal sulci less developed, short, almost straight, present about along posterior 0.2 of pronotum. Prosternal process widened in basal half, parallelsided in apical half, about 1.8 times as long as prosternum in front of coxae, lateral margins raised, posterior margin distinctly produced medially; surface of disc glabrous, those of sides rugose. Mesoventrite short, widest in middle, markedly constricted between coxae, mesoventral cavity deep. Metaventrite very finely impressed anteriorly between coxae; discrimen narrow, present along whole length; disc flat, sides with larger punctures, with row of deep partly fused punctures before each metacoxa, surface equally pubescent as prosternum. Elytra 3.07–3.37 mm long (EL), 1.84–1.98 mm wide (EW); disc convex, densely pubescent; sides slightly widened in anterior half, then 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 small and deep; striae not impressed; intervals not convex, with dense micropunctation. Scutellum longer than wide, subpentagonal. Legs pubescent, not modified; tibiae relatively long, mid- and hind tibiae without pubescence on upper side, with rows of cleaning fringes.

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 ventrite I without distinct larger setigerous punctures; posterolateral angles of ventrite III–IV very feebly protruding posteriad; apex of ventrite V rounded.

Aedeagus ( Figs. 24–26 ): in ventral/dorsal view phallobase wide, widest apically, distinctly narrowed toward base, with moderate rounded basal projection; parameres almost twice as long as phallobase, wide in basal half, very narrow in apical half, apices rounded; median lobe subequal in length with parameres, arrow-shaped, distinctly widened in basal third; fibula very long and narrow; ventral sac robust, finely sculptured in apical half; in lateral view parameres wide in basal half, very narrow in apical half, with finely curved apices, median lobe narrow, straight, apex curved. Ovipositor ( Figs. 43, 44 ) with terminal segment short, cylindrical, bearing several types of sensilla; preterminal segment 4.5 times as long as terminal segment, with pair of distinct sensilla in reticulated cuticle; basal segment almost 1.3 times as long as preterminal and distal segments combined, fulcrum ventrale curved in apical and distal parts.

Distribution. So far known only from a few localities in the Malaysian state of Sabah.

Etymology. This species is dedicated to Manfred A. Jäch, who kindly provided the material for this study.

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 24 – 26. Dryopomorphus jaechi n. sp. (holotype): 24) aedeagus ventral view; 25) aedeagus dorsal view; 26) aedeagus lateral view. 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.