Helochares (Hydrobaticus) hainanensis, Dong & Bian, 2021

Dong, Xue & Bian, Dongju, 2021, Three new species and two new records of Helochares (Hydrobaticus) MacLeay 1871 from China (Coleoptera: Hydrophilidae: Acidocerinae), Zootaxa 4950 (1), pp. 166-180 : 168

publication ID

https://doi.org/ 10.11646/zootaxa.4950.1.9

publication LSID

lsid:zoobank.org:pub:9D4DA78E-15BC-40D2-9F71-863396CB8402

DOI

https://doi.org/10.5281/zenodo.4643601

persistent identifier

https://treatment.plazi.org/id/DA75665B-FFA7-FF84-FF43-FE76FA74F816

treatment provided by

Plazi

scientific name

Helochares (Hydrobaticus) hainanensis
status

sp. nov.

Helochares (Hydrobaticus) hainanensis View in CoL sp. n.

( Figs. 1–4 View FIGURES 1–4 )

Material examined. Holotype (IAECAS): 1 male: “ CHINA: Hainan Province, / Qionghai City, Wanquan Town , | 2007.11.14, 19°11’N, 110°23’E, / 38 m, leg. Bian & Tong”. GoogleMaps

Diagnosis. This new species is similar to Helochares (Hydrobaticus) minor in habitus, but can be distinguished by the following characteristics: (1) dorsal punctures on head, pronotum and elytra are slightly smaller and shallower than in H. minor ( Figs. 1, 4 View FIGURES 1–4 ); (2) elytra with ten rows of impressed serial punctures, not forming striae ( Fig. 1 View FIGURES 1–4 ); (3) serial punctures are slightly larger than interstrial punctures ( Fig. 1 View FIGURES 1–4 ); (4) interstriae on elytra wide and flat ( Fig. 1 View FIGURES 1–4 ); (5) aedeagus with median lobe very slender and spine-like in appearance, as long as parameres ( Fig. 3 View FIGURES 1–4 ); (6) parameres wider in basal 0.85, then suddenly narrowed, apices narrowly rounded ( Fig. 3 View FIGURES 1–4 ).

Description. Habitus as in Figs. 1–2 View FIGURES 1–4 . BL: 4.5 mm, BW: 2.3 mm. Body oval, moderately convex. Head brown, pronotum and elytra yellowish-brown, apices of tarsal claws black, ventral side dark brown to black.

Head ( Fig. 4 View FIGURES 1–4 ). Labrum brown, anterior margin straight. Clypeus brown, broad, anterior margin strongly emarginate, moderately expanded laterally in front of eyes, with somewhat rounded lateral margin; densely punctate, lateral area with slightly sparse punctures. Eyes slightly bulging, somewhat prominent; several setae anteriad to eyes. Frontoclypeal suture distinct. Systematic punctures small and distinct. Antennae with nine antennomeres, yellowish-brown; club loosely articulated, densely pubescent. Maxillary palpi moderately long and slender, about 1.2 times long as the width of head, yellow, the second palpomere curved inwards. Mentum and submentum with coarse punctures and wrinkles.

Thorax ( Fig. 1–2, 4 View FIGURES 1–4 ). Pronotum about as twice wider than long; distinctly and densely punctate; anterior and posterior angles broadly rounded. Anterior margin slightly projected anteriad in mid-length, with a row of setae. Lateral margin slightly lighter in color; with a median dark mark closed to anterior margin and some larger punctures. Posterior margin slightly corrugate, with a transverse groove; near the posterior margin with a pair of small pits which overlap with black marks ( Figs. 1, 4 View FIGURES 1–4 ). Prosternum ( Fig. 2 View FIGURES 1–4 ) slightly bulging at the middle, not carinate; protruding posteriorly; pubescent and rugulose. Mesoventrite strongly convex at postmedian area. Metaventrite pubescent, with fine punctures, somewhat convex at middle portion. Elytra ( Fig. 1 View FIGURES 1–4 ) together slightly wider than pronotum, widest behind midpoint; with scutellary stria and ten impressed series of punctures, but not striate; interstrial punctures small and dense, as on head and pronotum; serial punctures slightly larger and deeper than interstrial punctures; interstriae wide and flat; posterior region with slightly sparse punctures. Scutellum triangular, with sparsely fine punctures.

Legs. Femora dark brown, tibiae and tarsi brown, apices of tarsal claws black. Femora densely pubescent with apical fifth glabrous. Tarsi with some dense white scattered setae.

Abdomen. All visible ventrites with dense pubescences and fine punctures; apex of the fifth ventrite strongly emarginate which is wider than deep ( Fig. 2 View FIGURES 1–4 ).

Aedeagus ( Fig. 3 View FIGURES 1–4 ). Slender, 1.1 mm long. Basal piece symmetrical, very short, about 0.15-times of the total length, the manubrium indistinct. Median lobe as long as parameres, very slender appearing as a long spine along its distal third; apophyses of median lobe extending beyond basal margin of basal piece. Parameres robust, wider in basal 0.85, then abruptly narrowed, apices narrowly rounded.

Distribution. Known only from the type locality in Hainan Province, China.

Etymology. Named after the type locality, Hainan Province, China.

Habitat ( Fig. 25 View FIGURES 25–27 ). Slow flowing river, with pebbles, silt, deadwood and sides with short shrubs and fireweed.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydrophilidae

SubFamily

Acidocerinae

Genus

Helochares

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