Platynectes Regimbart 1879
Creators: name: Jiang, Zhuo-Yin
name: Zhao, Shuang
name: Jia, Feng-Long
name: Šťastný, Jaroslav
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Dytiscidae
Platynectes

description: Key to Chinese species of the genus Platynectes Régimbart
1 Elytra with or without yellow transverse basal fascia, without longitudinal vittae................................... 2
- Elytra with transverse basal yellow fascia and eight longitudinal vittae........................................... 5
2 Elytra with yellow transverse basal fascia (Fig. 5B).................................. Platynectes rihai Šťastný, 2003
- Elytra without yellow transverse basal fascia............................................................... 3
3 Size larger (TL: 6.4–7.0 mm); elytra without yellow preapical spots (Fig. 3D); median lobe of aedeagus subapically moderately broadened (Fig. 7A)..................................................... Platynectes hainanensis Nilsson, 1998
- Size smaller (TL: 4.9–6.0 mm); elytra with yellow preapical spots; median lobe of aedeagus subapically slightly or not broadened................................................................................................ 4
4 Size larger (TL: 5.4–6.0 mm), body moderately convex, elongate oblong oval (Fig. 2A); median lobe of aedeagus subapically not broadened, apex pointed (Fig. 6A)............................................... Platynectes babai Satô, 1982
- Size smaller (TL: 4.9–5.5 mm), body distinctly more convex, broadly oval (Fig. 2B); median lobe of aedeagus subapically slightly broadened, apex rounded (Fig. 6C)............. Platynectes davidorum Hájek, Alarie, Šťastný & Vondráček, 2019
5 Median lobe of aedeagus subapically constricted before broadened and widely truncate rounded apex (Figs 7C–D)..................................................................... Platynectes kashmiranus lemberki Šťastný, 2003
- Median lobe of aedeagus subapically not constricted, apex rounded or pointed..................................... 6
6 Size larger (TL: 6.4–8.2 mm); median lobe of aedeagus subapically moderately to strongly broadened.................. 7
- Size smaller (TL: 5.2–6.5 mm); median lobe of aedeagus subapically slightly or not broadened....................... 8
7 Elytron with transverse basal fascia narrow, interrupted laterally (Fig. 1B); median lobe of aedeagus strongly broadened in apical fifth, with apex rounded, bevelled on both dorsal and ventral sides (Fig. 1E)............... Platynectes pangu sp. nov.
- Elytron with transverse basal fascia broad, uninterrupted and broadened laterally (Fig. 4D); median lobe of aedeagus in apical quarter markedly bent, moderately broadened, apex rounded (as in Šťastný 2003, Fig. 25).................................................................................................... Platynectes mazzoldii Šťastný, 2003
8 Median lobe of aedeagus with distinct protuberance near apex of basal piece on dorsal side, apical region elongate, apex rounded............................................................................................. 9
- Median lobe of aedeagus without distinct protuberance near apex of basal piece on dorsal side, apical region not elongate, apex rounded to bluntly pointed............................................................................. 10
9 Apical quarter of median lobe of aedeagus in lateral view almost of even width (Fig. 1C)..... Platynectes maizuqii sp. nov.
- Median lobe of aedeagus in lateral view slightly broadened subapically (Fig. 7H)... Platynectes nanlingensis Šťastný, 2003
10 Size larger (TL: 5.9–6.1 mm); median lobe of aedeagus abruptly narrowing from subapical part to apex (Fig. 7F).................................................................................... Platynectes major Nilsson, 1998
- Size smaller (TL: 5.2–5.8 mm); median lobe of aedeagus not abruptly narrowing from subapical part to apex........... 11
11 Elytral longitudinal vittae not reduced basally (Fig. 2C), or indistinct basally (Fig. 2D), or even vanishing on basal third (Fig. 3A); apex of median lobe of aedeagus more pointed (Figs 6E–H)................... Platynectes dissimilis (Sharp, 1873)
- Elytral longitudinal vittae not reduced basally (Figs 3B–C); apex of median lobe of aedeagus less pointed (Figs 6J–N)............................................................................ Platynectes gemellatus Šťastný, 2003
description: Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Jia, Feng-Long & Šťastný, Jaroslav, 2023, Two new species of Platynectes Régimbart, 1879 from China with notes on other Chinese members of the genus, including a key to species (Coleoptera: Dytiscidae: Agabinae), pp. 401-425 in Zootaxa 5227 (4) on pages 417-418, DOI: 10.11646/zootaxa.5227.4.1, http://zenodo.org/record/7518878