Description of three new species of Crenitis Bedel from China, with additional faunistic records for the genus (Coleoptera: Hydrophilidae: Chaetarthriinae) Author Jia, Fenglong Author Tang, Yudan Author Minoshima, Yûsuke N. text Zootaxa 2016 4208 6 561 576 journal article 37381 10.11646/zootaxa.4208.6.4 f06747dd-fe3e-4ca0-934a-8302dfbfe6e1 1175-5326 215062 9ED97579-934D-4156-9EDF-5465ED302326 Crenitis ( Crenitis ) aduncata sp. nov. ( Figs. 1–9 , 50 , 56–59 , 73 ) Type material: Holotype : CHINA : Yunnan : male ( SYSU ) , CHINA : Yunnan Prov., Baoshan City / Baihualing Jiujiezi / 25°18′N 98°47′E 2016m / 19.iv.2015 , Renchao Lin & / Yudan Tang leg. [transcribed from Chinese] . Paratypes (10 specs., SUSU , KMNH , NMPC ): CHINA : Yunnan : 4 specs., same data as holotype ; 6 specs., Yunnan Prov., Baoshan / City , Baihualing / 25°10′N 98°16′E 1516m / 18.iv.2015 , Renchao Lin & / Yudan Tang leg. [transcribed from Chinese]. Diagnosis. Body obovate. Head and pronotum without impression and microsculpture ( Figs. 4, 5 ). Anterior margin of labrum bearing a transverse row of setae. Pronotal punctures uneven, denser laterally than mesally. Ground punctures on elytra rather fine; ten rows of large punctures present on posterior half of elytra ( Fig. 1 ). Mesoventrite flat. Meso- and metafemora pubescent on basal four-fifths ( Figs. 2, 8, 9 ). Parameres with lateral incisions subbasally and subapically, strongly widening in midlength, with distinct hook-like lateral projection at apex. Apex of median lobe situated ca. apical ninth of paramere in length ( Fig. 50 ). This species is very similar to C. lianggeqiui and C. obovata . Ground punctures on elytra of C. aduncata are generally finer than in C. lianggeqiui (those of C. obovata are almost the same as C. aduncata ); reliable identification requires a careful examination of the male genitalia, this species can be distinguished from these species by the distinct hook-like apical projection of the paramere ( Fig. 50 ). Description. Length 3.6–4.0 mm, width 2.3–2.4 mm. Body obovate, attenuating posteriorly, convex ( Fig. 1 ). Color. Dorsal surface black to dark reddish brown, pronotum somewhat reddish brown, lateral margins of pronotum yellowish brown ( Figs. 1, 5 ). Maxillary and labial palps and antennae uniformly yellowish brown with infuscate antennal club. Ventral surface dark reddish brown or black, legs usually yellowish brown ( Fig. 2 ). Head. Labrum densely punctate, with broadly emarginate anterior margin; anterior margin of labrum bearing a row of setae densely distributed ( Fig. 56 ). Clypeus truncate anteriorly, with dense punctures ( Fig. 4 ) coarser than those on labrum. Frontoclypeal suture indistinct. Punctures slightly denser on frons than on clypeus. Eyes slightly protruding. Mentum ( Fig. 56 ) transverse, ca. 2 × as wide as long, with fine punctures, shagreened, without impression; anterior margin of mentum as wide as posterior margin, truncate ( Figs. 7 , 56 ). Labial palpomere 3 asymmetrical, as long as palpomere 2. Maxillary palpomere 4 asymmetrical, ca. 2 × as long as palpomere 3 ( Figs. 7 , 58 ). Antenna with nine antennomeres, club almost as long as antennomeres 2 to 6 combined. Gula narrow, subparallel ( Fig. 7 ), gular suture slightly curved medially. Thorax. Pronotum evenly convex, without impressions and systematic punctures; ground punctures on pronotum sparser than those on frons medially, denser and coarser laterally than mesally; intervals smooth, microsculpture absent. Lateral and anterior margins of pronotum weakly beaded ( Fig. 6 ), anterior margin clearly bisinuate, posterior margin weakly bisinuate, lateral margin evenly curved. Elytra attenuating posteriorly, systematic punctures absent. Ground punctures on elytra rather fine; ten rows of large serial punctures present on posterior half ( Fig. 1 ), lateral three rows strongly impressed, lateral two rows reaching anterior quarter ( Fig. 3 ). Sutural stria almost reaching anterior quarter, deeply impressed ( Fig. 1 ). Prosternum flat ( Figs. 2, 7 ), anterior margin broadly protruding. Mesoventrite flat ( Figs. 2, 9 ). Metaventrite covered with pubescence, bulging medially, with a small glabrous area ( Figs. 9 , 57 ). Meso- and metafemoral pubescence on basal four-fifths ( Figs. 2, 8, 9 , 59 ). Abdomen. Abdominal ventrites densely pubescent ( Figs. 2, 8 ). First ventrite not carinate; apical margin of fifth ventrite rounded ( Fig. 8 ). Aedeagus ( Fig. 50 ). Later margins of parameres with incision subbasally, then strongly inflated apical to incision; apex with distinct hook-like tooth laterally. Median lobe strongly narrowed apically; apex of median lobe situated in ca. apical ninth of parameres. Manubrium long, apex rounded. Etymology. The species name derived from Latin “aduncatus”, hook-like, referring to the shape of the parameres. Biology. Aquatic. Collected in a small pond with abundant leaf litter ( Fig. 73 ). Distribution. China (Yunnan).