Urumaelmis yunnanensis, Bian & Wang, 2021

Bian, Dongju & Wang, Zhanxiang, 2021, A new species of the genus Urumaelmis Satô, and the first record of the genus from China (Coleoptera: Elmidae), Zootaxa 5023 (1), pp. 142-146 : 143-145

Urumaelmis yunnanensis sp. nov.

( Figs 1–7 )

Holotype, male: “China, Baoshan / Mangkuan, Sandieshui / 25°26’25”N 98°50’16”E / 1135 m, 2019.7.3 / leg. Peng, Dong & Wang” . Paratypes, 1 male,the same data as holotype ; 1 male: “ China: Yunnan Ruili / Dayingjiang , Moli / 2016.10. 17, 830 m︱ 24°6’35”N 98°0’8”E / Leg. Wang, Peng and Sun (5)” ; 1 male “ CHINA: Yunnan, Yingjiang, Nabang , 2016.10. 21, 972 m/ 24°28’30”N 97°35’12”E, leg. Wang, Peng & Sun (14)” .

Diagnosis. Body black, elongate, 2.4–2.6 mm long, with median sulcus of pronotum present from basal 0.2 to basal 0.5, carinae on elytral intervals V and VI, extend nearly from base to apex, carinae on elytral intervals VII extend nearly from base to the middle. The new species differs from U. uenoi uenoi and U. uenoi tokarana by its larger body size, elytral carinae on intervals VI extend nearly from base to apex; and from U. flammea by its black body color, median groove of pronotum not reaching the base, pointed anterior pronotal angles and by absence of parameres.

Description. Male. Body ( Figs 1–2 ), elongate, 2.4–2.6 mm long, 1.05–1.1 mm wide. Head and elytra black, pronotum with disc black, lateral margin dark brown, anterior margin ferruginous. Legs with femora dark brown, tibiae brown, and tarsi light brown. Dorsum of elytra microreticulate; plastron present from interval V to lateral margin.

Head with frons smooth and shiny, sparsely punctate and pubescent. Frons more than twice as broad as eye; the area in the inside of eye with dense pubescence. Frontoclypeal suture straight; clypeus transverse, surface of clypeus similar to frons, anterior margin straight. Labrum microreticulate in basal half, smooth and shiny sparsely punctate and pubescent in apical half, anterolateral margin with dense, long, yellowish setae, anterior margin truncate. Antennae 8-segmented, first segment slightly inflated, second segment distinctly inflated, obviously larger than the first one, segments 3–7 small, segment 8 distinctly expanded, large and elongate.

Pronotum 0.6–0.7mm long, 0.7–0.8 mm wide, widest at base. Front margin broadly arcuate; anterior angles sharply produced, hind angles nearly right-angled; basal margin tri-sinuate, broadly arcuate on each side and narrowly in front of scutellum. Surface microreticulate, sparsely punctate with lateral sides sparsely pubescent. Anterior half of lateral margin finely serrate. Median sulcus present from basal 0.2 to 0.5. Sublateral carinae in basal third, vestigial, a very shallow groove present on the inner side of the trace extending from base to basal 0.75. Base with two to three distinct granules in front of anterior angles of scutellum. Scutellum pentagonal, smooth and shiny, very finely and sparsely punctate.

Elytra 1.8–1.95 mm long, 1.05–1.1 mm wide, broadest at basal 1/3, slightly narrowed anteriorly, and distinctly narrowed towards apex.Apices truncate, densely granulate at extreme apex ( Fig. 1a ). Elytral surface microreticulate from median suture to interval IV, not pubescent. The striae I–IV with punctures well developed, distinct. Interval I with longitudinal row of small punctures, intervals V and VI with carinae extending nearly from base to apex, interval VII with carina extending nearly from base to the middle. Sides of elytra densely pubescent. Lateral margin finely serrate.

Prosternum densely pubescent laterally, disc coarse, finely and sparsely punctate; prosternal process elongated, 1/3 as wide as prosternum basally, sub-triangular, with apex narrowly rounded, lateral margins distinctly ridged; surface coarse, only with few fine punctures. Mesoventrite shorter than prosternum and metaventrite, with a “V” shaped indention in anterior half for reception of the prosternal process. Disc of metaventrite broadly impressed in posterior half, surface micro-reticulate, sides densely pubescent, each side with two transverse rows of large punctures, one behind the middle coxae, second in front of hind coxae; discrimen thin, present in basal half.

Profermora clavate and distinctly larger than meso- and meta-femora, densely granulate, pubescent. Meso- and meta-femora densely pubescent, with small sparse granules. Tibae densely pubescent, with some small granules. Tarsi 5-segmented, sparsely pubescent, last segment elongated, as long as total length of segments 1–4, tarsal claws simple.

Abdomen with disc of ventrites I–III microreticulate, sparsely punctate; disc of ventrite IV and basal 1/5 of ventrite V smooth and shiny, almost without punctures and pubescence, sides densely pubescent; ventrite V densely pubescent and sparsely granulate except basal 1/5 of disc, apex of ventrite V slightly emarginate.

Aedeagus ( Figs 3–7 ) about 1.15 mm long. Phallobase parallel-sided. Penis elongate, about 1.8 times as long as phallobase, parallel-sided in basal 0.7, distinctly narrowed in distal 0.3, apex acute, ejaculatory duct partly sclerotized, with a pair of projections. Parameres absent.

Female. Unknown.

Distribution. China (Yunnan).

Etymology. This species is named after Yunnan Province, China.

Figures

FIGURES 1–4. Urumaelmis yunnanensis sp. nov. 1 habitus, dorsal view; 2 habitus, ventral view; 3. aedeagus, ventral view; 4. aedeagus, lateral view.

FIGURES 5–7. Aedeagus photos of Urumaelmis yunnanensis sp. nov. 5 ventral view; 6. dorsal view; 7. lateral view.