Cylomissus, BROUN, 1903

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 CYLOMISSUS BROUN, 1903

( FIG. 12I–N )

Material examined: Cylomissus glabratus Broun, 1903: 1 male, 1 female (NMPC): New Zealand: Otago Lakes, Little Meg headwaters at Cardrona Skifield Rd. , stream collecting in small exposed streamlets (stony and mossy), 44°52.60’S 168°57.65’E, 1280 m, 5.xii.2017, M. Fikáček, D. Sadílek & V. Sýkora lgt. (2017-NZ63). 1 male ( NMPC): New Zealand : Stewart Island, Fern Gully W of Oban, at bridge over Mill Creek , 17–21.i.2016, 46°53.52’S 168°6.00’E, 45 m, M. Seidel, V. Sýkora & M. Fikáček lgt. (2016- NZ 004) .

Karyotype: 2 n = 22 + Xy (♂). Autosome pair 1 is 3–4 times the length of pair 2, whereas the remaining pairs have a gradual decrease in length along the karyotype, with pair 11 about half the length of pair 2, the X chromosome is only slightly longer than pair 11. The Y chromosome is dot-like. Examined specimens from both localities have a similar karyotype.

Figures

Figure 12. Karyotypes of the Cylominae, without treatment. A–B, Adolopus sp., mitosis from midgut. D, Cyloma guttulatus, mitosis from midgut. E–G, Cyloma sp. (E–F, meiotic first metaphase; G, testes, mitosis;). I–M, Cylomissus glabratus: (I–J) mitotic metaphase from midgut; (K–M) meiotic metaphase I from testes. Habitus figures: (C) Adolopus sp.; (H) Cyloma sp., specimen collected with karyotyped voucher; (N) Cylomissus glabratus, from Minoshima et al. (2015).