Biodiversity Data Journal :
Taxonomy & Inventories
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Corresponding author: Dongju Bian (biandongju@163.com)
Academic editor: Cheng-Bin Wang
Received: 12 Dec 2023 | Accepted: 15 Mar 2024 | Published: 21 Mar 2024
© 2024 Dongju Bian, Yuqi Hu, Yanfeng Tong
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Bian D, Hu Y, Tong Y (2024) A new species of Cuspidevia Jäch & Boukal, 1995 (Coleoptera, Elmidae) from south China. Biodiversity Data Journal 12: e117248. https://doi.org/10.3897/BDJ.12.e117248
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Cuspidevia Jäch & Boukal, 1995 is a member of the tribe Macronychini which has the following features: antennae short, 6-10 segmented, aedeagus long and cylindrical, paramere very small, slender or lacking. This genus currently comprises only three species. All species are distributed in China.
Cuspidevia pilosus sp. nov. is reported from Guangdong, Guangxi and Jiangxi Provinces in China. Habitus and diagnostic features of the new species are illustrated.
riffle beetles, Cuspidevia, new species, Guangdong, Guangxi, Jiangxi
The genus Cuspidevia was established by
In this paper, a new species of the genus Cuspidevia, collected from Guangdong, Guangxi and Jiangxi, China, is described and illustrated.
Specimens were examined with a Leica M205c stereomicroscope. Male genitalia were placed in concentrated lactic acid in a cavity slide for several hours before they were examined. Habitus and genitalia photographs were made with Keyence VHX-2000 Super Resolution Digital Microscope System. The first strial interval refers to the sutural interval. The type specimens of the new species were deposited in the Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China (IAECAS) and the Institute of Entomology, Guizhou University, Guiyang, China (GUGC). Abbreviations used in the text: BL–body length = PL+EL, BW–maximum width of body (= EW), EL–elytral length, EW–maximum width of elytra, PL–pronotal length, PW–maximum width of pronotum.
BL 3.0 mm, BW 1.3 mm. Habitus see Fig.
Head. Labrum transverse, basal half densely micro-reticulate, distal half smooth and shiny, sparsely punctate and densely pubescent, with long setae laterally. Clypeus and frons densely punctate and pubescent, with some granules.
Pronotum. PL 0.85 mm, PW 0.90 mm. Pronotum (Fig.
Elytra. Elytra broadest at the middle, slightly narrowed anteriorly and distinctly attenuated posteriorly. Striae not developed, the first striae extending from base to basal 0.4, with large punctures deeply impressed (separated by 1–1.5 diameters), the striae Ⅱ to Ⅳ extending from basal 0.2 to 0.4. Intervals smooth and shiny, small punctures sparsely distributed and yellowish pubescence is dense. Intervals Ⅱ to Ⅳ distinctly elevated in basal 0.2. Intervals V, Ⅶ and Ⅷ carinate. Carinae V and VII extending from basal 0.1 to apex, carinae VIII extending from basal 0.1 to distal 1/6. Plastron is present from intervals 5 to lateral margin. Each elytral apex with an apical projection.
Ventral side of thorax. Prosternum densely pubescent. Prosternal process (Fig.
Ventrites I–V. Middle discs of ventrites I–IV and basal 0.2 disc of ventrite V smooth and shiny, only with a few short setae and small punctures, other areas of all ventrites densely pubescent. Ventrite I concave in basal half, with a pair of ad-median carinae. Apex of ventrite V not emarginate.
Aedeagus (Fig.
Measurements. Males: BL 2.9–3.1 mm, BW 1.2–1.3 mm; females: BL 3.0–3.2 mm, BW 1.3–1.4 mm.
This species is different from the other three known species in this genus by elytral intervals 5, 7 and 8 carinate, pronotum and disc of elytra densely pubescent and endophallus more developed reaching distal 0.4 of phallobase.
The epithet is derived from the Latin adjective “pilosus” = pilous, refers to dense pubescence on disc of elytra.
China: Guangdong, Guangxi, Jiangxi.
This species also has some characteristics which are different from the three known species in genus Cuspidevia, such as the median carinae lacking median sulcus, elytral intervals 5, 7 and 8 carinate and disc of elytra densely pubescent. Carinae on intervals are variable even within the same genus, such as Grouvellinus, with carinae on intervals 7, 8 or intervals 5, 7, 8 or intervals 3, 5, 7, 8. Therefore, we thought that the carinae on intervals are not as important as the male genitalia. Endophallus of this new species is quite similar to the three known species of genus Cuspidevia. In addition, this new species also has similar characteristics which are similar to the genus Cuspidevia, such as anterior angles of pronotum strongly acuminately produced anteriad, elytra broadest near the basal half, elytra striae obsolete in distal 0.6, apices of elytra densely granulate and slightly produced. After comparing with all known species in Cuspidevia and Zaitzevia, we assigned this new species to the genus Cuspidevia (
We want to thank H.B Sun and C. Guo who collected some type material of the new species. The manuscript benefitted greatly from comments by Manfred A. Jäch (Vienna, Austria), Rixin Jiang (Guiyang, China), the subject editor Chengbin Wang (Mianyang, China) and an anonymous referee. The field trip were partly supported by GDAS Special Project of Science and Technology Development (No. 2020GDASYL-20200102021, 2020GDASYL-20200301003).