Laccobius, ERICHSON, 1837

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 LACCOBIUS ERICHSON, 1837

( FIG. 2F–L )

Material examined: Laccobius (Compsolaccobius) decorus (Gyllenhal, 1827) . 2 males. ( BMNH): Sweden, Öland Island , R. Angus lgt .

Karyotype: 2 n = 16 + Xy p (♂). Centromeric C-bands strong. All autosomes, and X chromosome, metacentric. Autosomes similarly sized, X chromosome the largest in the nucleus.

Comments on karyotypes of Laccobius : Angus & Shaarawi (1997) published the karyotype data of two species of the subgenus Laccobius [ Laccobius colon (Stephens, 1829) and Laccobius minutus (Linnaeus, 1758) ] and four species of the subgenus Dimorpholaccobius [ Laccobius bipunctatus (Fabricius, 1775) , Laccobius sinuatus Motschulsky, 1849 , Laccobius striatulus (Fabricius, 1801) and Laccobius ytenensis Sharp, 1910 ]. Laccobius karyotypes all show 2 n = 16 + Xy p (♂). All autosomes and the X chromosome have strong centromeric C-bands, which are particularly strong in Laccobius striatulus and Laccobius sinuatus .

Figures

Figure 2. Karyotypes of the Amphiopini and Laccobiini. A–E, Amphiops mater, mitotic methaphase from midgut. F–L, Laccobius decorus, mitotic metaphase from midgut.A, C, F, H, J, without treatment. B, D, G, I, K, C-banded. Habitus figures: (E) Amphiops mater; (L) Laccobius decorus.