Crenitis (Crenitis) aduncata Jia, Tang & Minoshima, 2016, sp. nov.
Creators: name: Jia, Fenglong
name: Tang, Yudan
name: Minoshima, Yûsuke N.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hydrophilidae
Crenitis
Crenitis aduncata

description: 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).
description: Published as part of Jia, Fenglong, Tang, Yudan & Minoshima, Yûsuke N., 2016, Description of three new species of Crenitis Bedel from China, with additional faunistic records for the genus (Coleoptera: Hydrophilidae: Chaetarthriinae), pp. 561-576 in Zootaxa 4208 (6) on pages 562-563, DOI: 10.11646/zootaxa.4208.6.4, http://zenodo.org/record/215062