Platynectes Régimbart, 1879

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), Zootaxa 5227 (4), pp. 401-425 : 417-418

publication ID	https://doi.org/ 10.11646/zootaxa.5227.4.1
publication LSID	lsid:zoobank.org:pub:01305E7E-626B-4545-A7A5-F15BB23EC3A9
DOI	https://doi.org/10.5281/zenodo.7524605
persistent identifier	https://treatment.plazi.org/id/0F5587DC-FFFF-FF98-5FDA-FAB3E5F527CD
treatment provided by	Plazi
scientific name	Platynectes Régimbart
status

Treatment

Key to Chinese species of the genus Platynectes Régimbart View in CoL View at ENA

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 View FIGURE 5 ).................................. Platynectes rihai Šťastný, 2003 View in CoL

- Elytra without yellow transverse basal fascia............................................................... 3

3 Size larger (TL: 6.4–7.0 mm); elytra without yellow preapical spots ( Fig. 3D View FIGURE 3 ); median lobe of aedeagus subapically moderately broadened ( Fig. 7A View FIGURE 7 )..................................................... Platynectes hainanensis Nilsson, 1998 View in CoL

- 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 View FIGURE 2 ); median lobe of aedeagus subapically not broadened, apex pointed ( Fig. 6A View FIGURE 6 )............................................... Platynectes babai Satô, 1982 View in CoL

- Size smaller (TL: 4.9–5.5 mm), body distinctly more convex, broadly oval ( Fig. 2B View FIGURE 2 ); median lobe of aedeagus subapically slightly broadened, apex rounded ( Fig. 6C View FIGURE 6 )............. Platynectes davidorum Hájek, Alarie, Šťastný & Vondráček, 2019 View in CoL

5 Median lobe of aedeagus subapically constricted before broadened and widely truncate rounded apex ( Figs 7C–D View FIGURE 7 )..................................................................... Platynectes kashmiranus lemberki Šťastný, 2003 View in CoL

- 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 View FIGURE 1 ); median lobe of aedeagus strongly broadened in apical fifth, with apex rounded, bevelled on both dorsal and ventral sides ( Fig. 1E View FIGURE 1 )............... Platynectes pangu sp. nov.

- Elytron with transverse basal fascia broad, uninterrupted and broadened laterally ( Fig. 4D View FIGURE 4 ); median lobe of aedeagus in apical quarter markedly bent, moderately broadened, apex rounded (as in Šťastný 2003, Fig. 25).................................................................................................... Platynectes mazzoldii Šťastný, 2003 View in CoL

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 View FIGURE 1 )..... Platynectes maizuqii sp. nov.

- Median lobe of aedeagus in lateral view slightly broadened subapically ( Fig. 7H View FIGURE 7 )... Platynectes nanlingensis Šťastný, 2003 View in CoL

10 Size larger (TL: 5.9–6.1 mm); median lobe of aedeagus abruptly narrowing from subapical part to apex ( Fig. 7F View FIGURE 7 ).................................................................................... Platynectes major Nilsson, 1998 View in CoL

- 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 View FIGURE 2 ), or indistinct basally ( Fig. 2D View FIGURE 2 ), or even vanishing on basal third ( Fig. 3A View FIGURE 3 ); apex of median lobe of aedeagus more pointed ( Figs 6E–H View FIGURE 6 )................... Platynectes dissimilis ( Sharp, 1873) View in CoL

- Elytral longitudinal vittae not reduced basally ( Figs 3B–C View FIGURE 3 ); apex of median lobe of aedeagus less pointed ( Figs 6J–N View FIGURE 6 )............................................................................ Platynectes gemellatus Šťastný, 2003 View in CoL