Dryopomorphus grandis, 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 : 6-9

Dryopomorphus grandis n.sp.

Figs. 5 , 21–23 , 40–42

Type locality: Malaysia, Sabah, Crocker range Mountains—submontane rainforest stream surrounded by primary forest. The type material was collected below Sunsuron waterfall in ca. 4–5 m wide stream with gravel, large boulders and submerged logs.

Type material: holotype male ( NMW): ” Malaysia, Sabah, Crocker Range, around km 56 of road Kota Kinabalu Temburon, Sunsuron Waterfall env., 1100–1200m a.s.l., 8.VI.1996, 5a”, paratypes ( CCB, CKB, NMW): 3 males, 4 females: ” Malaysia, Sabah, Crocker Range, around km 56 of road Kota Kinabalu Temburon, Sunsuron Waterfall env., 1100–1200m a.s.l., 8.VI.1996, 5a”, 12 males, 8 females: ” Malaysia, Sabah, Crocker Range, Mawar Waterfall env., 17.VI.1996, 9a, river about 4–6m wide, flowing through primary forest, shaded”.

Diagnosis: The largest known species, outline constricted between pronotum and elytra, pronotum without median longitudinal line, parameres short, phallobasis long with distinct basal projection, median lobe with knifeshaped apex in lateral view.

Description. Body elongate, largest species (CL: 3.98–4.39 mm), 2.15–2.28 times longer than wide (CL/EW), convex dorsally ( Fig. 5 ); dorsal surface with very dense short adpressed yellowish setae and sparser longer semierect setae. Coloration of head, pronotum, elytra dark brown, femora, tibiae paler, tarsi, antennae and anterior pronotal angles 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, anterior margin mesally slightly emarginate; 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: 0.48–0.58 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: 1.40–1.53 mm, PL: 0.90–1.00 mm; disc convex, punctures well impressed very dense on entire surface; lateral margins slightly explanate, subparallel, only slightly converging anteriad; anterior angles more explanate than sides, produced, rounded; hypomeron narrowed posteriad, anteriorly ca. three times as wide as protibia, anterior depression well impressed, with carina along posterior margin, surface rough, densely setose. Sublateral basal sulci shallow, almost straight, present ca. along posterior third of pronotum. Prosternal process twice as long as prosternum in front of coxae, lateral margins raised, posterior margin distinctly produced medially, surface of prosternum rugose with dense small and sparse longer setae. Mesoventrite short, widest in middle, markedly constricted between coxae; mesoventral cavity deep. Metaventrite impressed anteriorly between coxae; discrimen thin, present along whole length; disc flat, sides with larger punctures, row of deep and partly fused punctures anteriorly of each metacoxa, surface with denser pubescence than prosternum. Elytra 3.09–3.39 mm long (EL), 1.75–2.00 mm wide (EW); disc convex, densely pubescent; sides parallel 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; strial punctures equally small, hardly visible beneath pubescence, striae not impressed; intervals not convex, with dense micropunctation. Scutellum longer than wide, sides arcuate. Legs pubescent, tibiae relatively long.

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 with larger setigerous punctures; posterolateral angles of ventrite II–IV feebly protruding posteriad; apex of ventrite V rounded. Ninth segment with spiculum gastrale as in Fig. 40 .

Aedeagus ( Figs. 21–23 ): in ventral/dorsal view phallobase wide, slightly longer than median lobe, subparallel, widest in middle, with distinct basal process; parameres ca. 0.75 times as long as phallobase, widest around middle, slightly constricted subapically, apices widely rounded in lateral view, obliquely truncated in ventral/dorsal view; median lobe slightly longer than parameres, widest near middle, strongly narrowed apically, sinuate in lateral view, dorsal side with distinct apical keel; fibula indistinct; ventral sac robust, finely sculptured in apical portion.

Ovipositor ( Figs. 41, 42 ) robust, long, with terminal segment short, cylindrical, bearing several types of sensilla; preterminal segment distinctly elongate 4.9 times as long as terminal segment, with pair of distinct sensilla; basal segment ca. 1.3 times as long as preterminal and distal segments combined, fulcrum ventrale feebly curved. Distribution. So far known only from a few localities in the Malaysian state of Sabah.

Etymology. The species name is from latin grandis —big, as this is the biggest known species of the genus.

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 21 – 23. Dryopomorphus grandis n. sp. (holotype): 21) aedeagus ventral view; 22) aedeagus dorsal view; 23) aedeagus lateral view. 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.

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.