Horelophus, d Orchymont, 1913

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-

GENUS HORELOPHUS D’ ORCHYMONT, 1913

( FIG. 7E–K )

M a t e r i a l e x a m i n e d: H o r e l o p h u s w a l k e r i dʼ Orchymont , 1913: 2 males ( NMPC) : New Zealand, Nelson ( NN) , Kahurangi Nat. Park, AppleTree Flat at Cobb Dam Road , 200 m, 41.0744°S 172.75761°E, 12.xii.2016, hygropetric habitat: exposed rocks with thin film of water, moss and algae, M. Fikáček & M. Seidel lgt. ( MM73 ). 1 male ( NMPC) : New Zealand: Marlborough, Pelorus Bridge Scenic Reserve, first waterfall at Tawa Walk , 41.30526°S 173.56739°E, 55 m, floating moss from small waterfall in Nothofagus Blume forest, 11.xii.2016, M. Fikáček & M. Seidel lgt. ( MM69 b) .

Karyotype: 2 n = 16 + Xy (♂). Horelophus chromosomes seems to be acrocentric to subacrocentric and decrease in size along the karyotype. X chromosome is about as long as chromosomes 6–8.

TRIBE CHAETARTHRIINI

Figures

Figure 7. Mitotic karyotypes of Chaetarthriinae from the midgut.A–C: Anacaena: (A) Anacaena gaetanae; (B–C) Anacaena lutescens (B, sexually reproducing specimen; C, parthenogenetic female). E–J, Horelophus walkeri. L, Chaetarthria simillima. A, C-banded; B, C, E–J, L, without treatment. Habitus figures: (D) karyotyped voucher of Anacaena gaetanae; (K) Horelophus walkeri, from Fikáček et al. (2012a); (M) Chaetarthria seminulum, from Fikáček & Liu (2019).