Dryopomorphus ruiliensis

Bian, Dongju, Dong, Xue & Peng, Yunfei, 2018, Two new species of the genus Dryopomorphus Hinton, 1936 from China (Coleoptera, Elmidae), ZooKeys 765, pp. 51-58: 54-57

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Dryopomorphus ruiliensis

sp. n.

Dryopomorphus ruiliensis  sp. n. Figures 3-4, 8-10

Type material.

Holotype, male ( IAECAS): "CHINA: Yunnan, Ruili, / Yingjiang, ca. 830 m, | 24°6'35.634"N, 98°0'8.160"E, / 2016.10.17, Leg. Wang et al. (5)". Paratypes: 2 males ( IAECAS), 2 females ( IAECAS), same data as holotype; 1 male ( IAECAS): "CHINA: Yunnan, Yingjiang, / Nabang, 1308m, | 24°36'50"N, 97°35'58"E, / 2016.10.21, Leg. Peng & Sun (14)"; 1 female ( IAECAS): "CHINA: Yunnan, Tengchong, / Mingguang, 1826m, | 25°28'39"N, 98°31'53"E / 2016.10.24, Leg. Peng & Sun (19)"; 1 ex. ( NMW): "CHINA: Yünnan, Xishuangbanna / ca. 15km W Menglun / 5.11.1999, ca. 700-800 m / leg. Jäch, et al. (CWBS 354)"; 1 ex. ( NMW): "CHINA: Yünnan, Xishuangbanna / ca. 10km NW Menglun / 7.11.1999, ca. 700 m / leg. Jäch, et al. (CWBS 359)"; 1 ex. ( NMW): "CHINA: Yünnan, Xishuangbanna / ca. 10km NW Menglun / 7.11.1999, ca. 700-800 m / leg. Jäch, et al. (CWBS 360)"; 7 exs. ( NMW): "CHINA: Yünnan, Xishuangbanna / ca. 6km NW Mengla / 8.11.1999, ca. 700 m / leg. Jäch, et al. (CWBS 365)"; 2 exs. ( NMW): "CHINA: Yünnan, Xishuangbanna / ca. 6km NW Mengla / 9.11.1999, ca. 700 m / leg. Jäch, et al. (CWBS 367)"; 2 exs. ( NMW): "CHINA: Yünnan, Xishuangbanna / pass betw. Jinghong - Mengyang / 12.11.1999, ca. 1100 m / leg. Jäch, et al. (CWBS 379)".


Body elongate, dark brown; anterior angles of pronotum explanate, slightly protruding, median sulcus of pronotum straight, present at posterior 0.7 and sublateral sulci present in posterior 0.3; elytral punctures on disc small and in lateral striae large and distinct. This species can be distinguished from Dryopomorphus heineri  sp. n. by: 1. pronotum less convex, anterior angles less protruding; 2. elytra subparallel in basal 2/3, then gradually converging posteriorly to separately rounded apices; 3. parameres slightly extending beyond penis, with apices narrowly rounded, whereas in D. heineri  sp. n. the parameres distinctly extend beyond penis and the apices are angulate. This species can be distinguished from all other known species of the genus by the different shape of the parameres which are gradually narrowed from the base towards the apex in ventral view, distinctly narrowed in basal half in dorsal view, with sub-distal portion slightly inflated and apices narrowly rounded.


(holotype). Body elongate, BL 4.14 mm, BW 1.88 mm, dorsal surface covered with short adpressed yellowish setae and long sub-erect setae which are black on the basal 3/4 and yellowish at the distal 1/4. Dorsum dark brown, anterior corners of pronotum and legs reddish brown, antennae yellowish brown, ventral surface dark brown.

Head. Partly retractable into thorax. Labrum short, densely setose, anterior margin almost truncate, with long yellowish setae, lateral angles almost rounded. Clypeus longer and wider than labrum, approx. twice as wide as long, densely setose, frontoclypeal suture straight; surface of labrum and clypeus densely punctate. Eyes large, slightly protruding from head outline. Pubescence of frons denser on a central triangular area; frons and vertex densely punctate, punctures setose.

Thorax. Pronotum widest at base, broader than long. PL 0.96 mm, PW 1.49 mm. Disc convex, densely punctate, lateral margin narrowly rimmed, slightly tilt inward, anterior angles slightly protruding. Median sulcus straight, present along posterior 0.7 of pronotum; sublateral sulci deeply impressed, present on posterior 0.3 of pronotum. Hypomeron sub-parallel, narrowed posteriorly, anterior depression developed for reception of antennae; surface coarsely punctate, densely setose. Prosternal process 1.8 times as long as prosternum in front of coxae, lateral margin distinctly raised and sub- parallel at anterior 0.7, posterior margin distinctly produced medially; surface of prosternum densely setose and sublateral area very coarse. Mesoventrite short, mesoventral cavity for reception of prosternal process very deep. Metaventrite impressed anteriorly between mesocoxae; discrimen narrow, present from anterior impression to posterior margin; disc flat, finely and densely punctate, densely setose; sub-lateral area with two kinds of punctures, fine punctures dense, large punctures sparse.

Elytra oblong, EL 3.18 mm, EW 1.88 mm; disc convex, densely pubescent, subparallel in basal 2/3, then gradually converging posteriorly to separately rounded apices. Each elytron with 10 striae; punctures deeply impressed, on disc and distal striae smaller, on lateral striae large and distinct. Intervals between striae slightly convex, with dense micro-punctures. Scutellum longer than wide, subpentagonal.

Abdomen. Intercoxal process of the first ventrite triangular, longer than wide, lateral margin with carina reaching posterior margin of first ventrite, admedian cavities short, oblique. Lateral portion of ventrites 1-3 with large punctures; posterolateral angles of ventrites 2-4 protruding posteriorly. Apex of ventrite 5 rounded. Surface of ventrites finely and densely punctate, densely pubescent.

Aedeagus (figures 8-10). Approximately 0.9 mm. In ventral view (figure 8), phallobase distinctly shorter than penis; parameres gradually narrowed from base towards apex, slightly extending beyond penis, sub-distal portion slightly inflated, apices narrowly rounded; penis robust, ventral sac finely sculptured in apical portion. In dorsal view (figure 9), parameres distinctly narrowed in basal half.

Males: BL 3.93-4.14 mm, BW 1.80-1.88 mm.

Females: BL 4.04-4.08 mm, BW 1.82-1.88 mm. Externally similar to males.


China: Yunnan.


This species is named after Ruili City, Yunnan Province, China.


A photograph of the habitat of D. ruiliensis  sp. n. was published by Jäch and Ji (2003: figure 5).