Platynectes dissimilis ( Sharp, 1873 )

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 : 407

Platynectes dissimilis ( Sharp, 1873)

( Figs 2C–D , 3A , 6E–I , 8B–C , 10B )

Agabus dissimilis Sharp, 1873: 50 (orig. descr.).

Platynectes dissimilis ( Sharp, 1873) : Sharp 1882: 543 (n. comb.), Régimbart 1899: 288 (descr.), Guéorguiev 1972: 46 (descr.), Brancucci 1979: 202 (fauna), Satô 1982: 2 (syntype illustrated), Nilsson 1995: 56 (fauna), Šťastný 2003: 231 (descr.). Platynectes dissimilis dissimilis ( Sharp, 1873) : Nilsson 1998: 111 (descr.).

Type locality. “ Japan ” (possibly mislabelled as never confirmed to occur in Japan).

Type material. Syntype, deposited in BMNH.

Material examined. CHINA: Guangdong: 4 ♂, 1 ♀, Zhaoqing, Dinghu , 19.vi.1958, C. Li leg. ( SYSU) ; 7 ♂, 12 ♀, Dinghushan Mt. , 23.vii.1964, T. Peng leg. ( SYSU) ; 4 ♂, 4 ♀, Danxiashan Mt. , 23.v.2008, F. Jia leg. ( SYSU) ; 3 ♂, 4 ♀, Danxiashan Mt., Zhanglaofeng , 10.vi.2011, F. Jia leg. ( SYSU) ; 1 ♀, Danxiashan Mt., Yangyuanshan , 10.vi.2011, F. Jia leg. ( SYSU) ; 7 ♂, 11 ♀, Danxiashan Mt., Jinshi , puddle under rock wall, 11.vi.2011, F. Jia leg. ( SYSU) ; 1 ♂, 1 ♀, Zhaoqing, Dinghu distr., Dinghushan Mt. , Feishuitan , 23.1754N, 112.5415E, 100 m, 2.iv.2021, Z. Jiang leg. ( SYSU) ; 4 ♂, 5 ♀, Zhaoqing, Dinghu distr., Dinghushan Mt. , Feiqianqiao , 23.1748N, 112.5385E, 195 m, 3.iv.2021, Z. Jiang leg. ( SYSU) ; 2 ♂, 2 ♀, Zhaoqing, Dinghu distr., Dinghushan Mt. , Dizhi management station, 23.1609N, 112.5323E, 90 m, 11.vii.2021, Z. Jiang, Z. Mai & Z. Liang leg. ( SYSU) ; 2 ♂, 1 ♀, Zhaoqing, Dinghu distr., Dinghushan Mt. , Qingyunsi management station, 23.1736N, 112.5361E, 250 m, 12.vii.2021, Z. Jiang, Z. Mai & Z. Liang leg. ( SYSU) ; 1 ♂, Zhaoqing, Dinghu distr., Dinghushan Mt. , Qingyunsi management station, 23.1732N, 112.5354E, 260 m, 17.x.2021, Z. Jiang, Z. Mai & W. Xie leg. ( SYSU) ; 3 ♂, 2 ♀, Zhaoqing, Dinghu distr., Dinghushan Mt. , Feiqianqiao-Qingyunsi , 23.1748N, 112.5385E, 195 m, 15.iii.2022, Z. Jiang & Z. Mai leg. ( SYSU) ; 2 ♂, Zhaoqing, Dinghu distr., Dinghushan Mt. , Qingyunsi management station, 23.1732N, 112.5354E, 260 m, 15.iii.2022, Z. Jiang & Z. Mai leg. ( SYSU) ; 1 ♀, Zhaoqing, Dinghu distr., Dinghushan Mt. , Tingquan Stone Carving, 23.1730N, 112.5434E, 60 m, 15.iii.2022, Z. Jiang & Z. Mai leg. ( SYSU) ; Guangxi: 3 ♂, 5 ♀, Guilin, Longsheng County, Huaping Nature Reserve , 25.6239N, 109.9196E, 820 m, 22.viii.2020, day, Z. Jiang leg. ( SYSU) ; 1 ♂, Guilin, Ziyuan County, Maoershan Mt. , Huilong Tmple , 25.9125N, 110.4656E, 1560 m, 30.viii.2020, day, Z. Jiang leg. ( SYSU) ; 7 ♂, 3 ♀, Guilin, Xingan County, Maoershan Mt. , Huilong Tmple , 25°54′27″N, 110°28′3″E, 1070 m, 2.ix.2020, Z. Yang leg. ( SYSU) ; Hunan: 3 ♂, 1 ♀, Yongzhou, Jiangyong County, Dupangling , Shangmuyuan , 25.3850N, 111.2932E, 320 m, 2.ix.2020, night & light trap, Z. Jiang leg. ( SYSU) ; 3 ♂, Yiyang, Anhua County, Meicheng Town , Yunhe Village , 28.ii.2022, H. Mao leg. ( SYSU) ; Jiangxi: 3 ♂, 3 ♀, Sanqingshan Mt. , 15.viii.2006, F. Jia & H. Chen leg. ( SYSU) ; 4 ♂, 8 ♀, Jinggangshan Mt., Dabali , 28. iv.2011, S. Zhao leg. ( SYSU) ; Shaanxi: 1 ♂, 1 ♀, Huashan Mt. , 24.viii.1984, Z. Huang leg. ( SYSU) ; Zhejiang: 1 ♂, Quzhou, Qujiang distr., Caojiang Line (near Mingguo Temple ), 29.1725N, 118.9054E, 240 m, 14.iii.2020, Z. Jiang leg. ( SYSU) ; 7 ♂, 4 ♀, Quzhou, Jiangshan, Jinjia , 28.8734N, 118.6985E, 180 m, 20.iv.2020, Z. Jiang leg. ( SYSU) ; 5 ♂, 6 ♀, Quzhou, Qujiang distr., Chacao , 29.2158N, 118.8261E, 455 m, 29.iv.2020, Z. Jiang leg. ( SYSU) ; 3 ♂, 10 ♀, Quzhou, Qujiang distr., Liuchun Lake , Taoyuanjian , 28.7425N, 119.0389E, 780 m, 3.v.2020, Z. Jiang & X. Ye leg. ( SYSU) ; 4 ♂, 4 ♀, Quzhou, Changshan County, Tianpu Village , 29.0727N, 118.6930E, 760 m, 24.vi.2020, Z. Jiang & X. Ye leg. ( SYSU) ; 1 ♂, 1 ♀, Quzhou, Kaihua County, Gutianshan Nature Reserve , 29.2499N, 118.1402E, 695 m, 20.ii.2021, Z. Jiang & X. Ye leg. ( SYSU) ; 2 ♂, 1 ♀, Quzhou, Qujiang distr., Yaowangshan Mt. , Shennong Waterfall , 28.7632N, 118.9731E, 340 m, 24.viii.2021, Z. Jiang & X. Ye leg. ( SYSU) .

Notes. Habitus and male genitalia are given in Figs 2C–D , 3A and 6E–I .

Collection details. In Zhejiang, the specimens were collected together with P. gemellatus among decaying leaves in a stream within the Gutianshan Nature Reserve ( Fig. 8B ) and in a puddle at the bottom of a rock wall covered with a film of seeping water, near Tianpu Village ( Fig. 8C ).

Distribution. Central and southeastern China (Anhui, Fujian, Guangdong, Guizhou, Guangxi, Hunan, Jiangxi, Shaanxi, Shanxi, Zhejiang) ( Fig. 10B ). First record from Guangxi Zhuang Autonomous Region.

Notes. Platynectes dissimilis exhibits highly variable elytral pattern. Examined specimens of P. dissimilis from Zhejiang and Sanqingshan Mt. (Jiangxi) had the elytral yellow vittae absent from the basal third of the elytra ( Fig. 3A ), two specimens from Shaanxi and a single specimen from Anhua County (Hunan) had the elytral yellow vittae indistinct only basally ( Fig. 2D ), whereas other specimens examined from south China were fully coloured ( Fig. 2C ). Since specimens we checked from southern areas (Guangdong, Guangxi and south Hunan) are more fully coloured, this variation might be related to temperature .

Figures

FIGURE 2. Habitus of Platynectes species. (A) P. babai Satô (♂; Kaohsiung, Taiwan); (B) P. davidorum Hájek et al. (♂; Yaowangshan, Zhejiang); (C) P. dissimilis (Sharp) (♂; Dinghushan, Guangdong); (D) P. dissimilis (Sharp) (♂; Yunhe Village, Hunan). Scale bar = 2.0 mm.

FIGURE 3. Habitus of Platynectes species. (A) P. dissimilis (Sharp) (♂; Gutianshan, Zhejiang); (B) P. gemellatus Šťastný (♂; Nanling, Guangdong); (C) P. gemellatus Šťastný (♂; Gutianshan, Zhejiang); (D) P. hainanensis Nilsson (♂; Limushan, Hainan). Scale bar = 2.0 mm.

FIGURE 6. Male genitalia of Platynectes species. (A, C, E–H, J–N) median lobe in lateral view; (B, D, I, O) paramere. (A–B) P. babai Satô (Kaohsiung, Taiwan); (C–D) P. davidorum Hájek et al. (Yaowangshan, Zhejiang); (E) P. dissimilis (Sharp) (Dinghushan, Guangdong); (F) P. dissimilis (Sharp) (Huaping, Guangxi); (G) P. dissimilis (Sharp) (Yunhe Village, Hunan); (H–I) P. dissimilis (Sharp) (Gutianshan, Zhejiang); (J) P. gemellatus Šťastný (Rongshuao, Hongkong); (K) P. gemellatus Šťastný (Baim- aoping Town, Hunan); (L) P. gemellatus Šťastný (Jinggangshan, Jiangxi); (M) P. gemellatus Šťastný (Gutianshan, Zhejiang); (N–O) P. gemellatus Šťastný (Nanling, Guangdong). Scale bars = 0.5 mm.

FIGURE 8. Habitat of Platynectes species. (A) Yaowangshan, Zhejiang (P. davidorum); (B) Gutianshan, Zhejiang (P. dissimilis & P. gemellatus); (C) Tianpu Village, Zhejiang (P. dissimilis); (D) Liuxihe, Guangdong (P. gemellatus).

FIGURE 10. Maps of distribution of Platynectes species in China. (A) P. babai and P. davidorum; (B) P. dissimilis.