Paracymus, THOMSON, 1867

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 PARACYMUS THOMSON, 1867

( Fig. 3A–H )

Material examined: Paracymus aeneus (Germar, 1824) : 2 spec. ( BMNH): United Kingdom, England, Isle of Wight, R. Angus lgt .

Paracymus scutellaris (Rosenhauer, 1856) : 2 spec. ( BMNH): United Kingdom, England, Hampshire, New Forest , R. Angus lgt .

Karyotype: 2 n = 16 + Xy p (♂). No C-banding was attempted. Autosome 1 is distinctly longer than the others and X is the shortest (apart from y) in both species.

Figures

Figure 3. Karyotypes of the Laccobiini, without treatment. A–H, Paracymus: (A–B) Paracymus aeneus, mitotic metaphase from midgut; (C–D) Paracymus scutellaris (C, spermatogonial mitosis, metaphase; D, mitotic metaphase from midgut.); (E–G) meiotic metaphase I from testes (E, Paracymus aeneus; F–G, Paracymus scutellaris). I–M, Tormus, mitotic metaphase from midgut: (I, K) Tormus posticalis; (J, L) Tormus helmsi. Habitus figures: (G) Paracymus scutellaris; (M) Tormus helmsi, from Fikáček et al. (2013).