Hydrobius, LEACH, 1815

Angus, Robert B, Sadílek, David, Shaarawi, Fatma, Dollimore, Hayley, Liu, Hsing-Che, Seidel, Matthias, Sýkora, Vít & Fikáček, Martin, 2021, Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records, Zoological Journal of the Linnean Society 192 (3), pp. 958-958 : 958-

publication ID	https://doi.org/ 10.1093/zoolinnean/zlaa105
persistent identifier	https://treatment.plazi.org/id/356287D9-FF9F-AF3C-4E28-F98BFDB66A40
treatment provided by	Felipe
scientific name	Hydrobius
status

Treatment

GENUS HYDROBIUS LEACH, 1815 View in CoL

( FIG. 4A–J View Figure 4 )

Material examined: Hydrobius fuscipes (Linnaeus, 1758) : 2 spec. ( BMNH): United Kingdom, England, Sheppey Island , R. Angus lgt .; 1 spec. ( BMNH): Spain: Menorca, G. Foster lgt. [specimen barcoded

by J. Bergsten and confirmed to belong to Hydrobius fuscipes sensu Fossen et al. (2016) ].

Hydrobius arcticus Kuwert, 1890: 1 spec. (BMNH): Sweden, Abisko National Park , G. N. Foster & A. N. Nilsson lgt. [specimens from this locality barcoded by J. Bergsten and confirmed to belong to H. arcticus sensu Fossen et al. (2016) ].

Hydrobius rottenbergii Gerhardt, 1872: 1 spec. (BMNH): Sweden, Angermanland GoogleMaps , Nordmaling, Järnäsklubb 63.4314°N, 19.6597°E, rockpools by the sea, 13.x.2017, A.N. Nilsson lgt. [Material from this locality barcoded by J. Bergsten and confirmed to belong to H. rottenbergii sensu Fossen et al. (2016) ].

Hydrobius subrotundus Stephens, 1829: 3 spec. (BMNH): England, Westmorland, swamp near Borderside GoogleMaps , 54.305°N 2.876°W. 34 m a.s.l., 18.iii.2016, G. Foster lgt.; 2 spec. ( BMNH): France, Aubrac , R. Angus lgt .; 2 spec. ( BMNH): Scotland, Kype Muir, S. Routledge lgt. [one specimen barcoded by J. Bergsten and confirmed to belong to H. subrotundus sensu Fossen et al. (2016) ] .

Hydrobius pui Jia, 1995: 9 spec. (BMNH): China, Sichuan, Maba Prefecture, Songpan County, pools beside Chuanzhusi-Huanglong, road, by Mt Baoxueding, 3650 m a.s. l., 32°43’37.19”N 103°40’0.7”E, 8.vii.2016, R. Angus & F-L Jia lgt. [These specimens were sequenced by J. Bergsten and indicated to belong to the same barcoding clade as specimens from Kangding County, Xinduqiao, Gaba, Liqi village, 29°56’35.80”N 101°35’21.46”E, 3359 m a.s.l., 28.vi.2016, R.B. Angus, F-L. Jia, Z-Q. Li & K. Chen lgt. which were not karyotyped. Type locality of H. pui is Yushu in southern Qinghai, but the fact that our material from two widely separated localities belongs to the same DNA clade gives confidence that all these specimens are conspecific with H. pui .]

Karyotype: 2 n = 16 + Xy (♂). All species with chromosomes 1 and 2 metacentric, 3–7 submetacentric, and 8 and X subacrocentric, X the smallest apart from dot-like y. In H. fuscipes , the English material ( Fig. 4A–B View Figure 4 ) has a centromeric C-band on chromosome 8, Menorcan material ( Fig. 4C View Figure 4 ) has additional bands on chromosomes 5 and 6. Hydrobius subrotundus ( Fig. 4F–H View Figure 4 ) chromosomes have the size and form as H. fuscipes but often with apical satellite C-bands on chromosomes 3–7. Hydrobius arcticus ( Fig. 4D View Figure 4 ) and H. rottenbergii ( Fig. 4E View Figure 4 ) are characterized by weak C-bands on the X chromosome. Hydrobius pui ( Fig. 4I View Figure 4 ) bears weak centromeric C-bands.