Protosternum, SHARP, 1890

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 PROTOSTERNUM SHARP, 1890

( FIG. 15J–L )

Material examined: Protosternum abnormale (dʼ Orchymont, 1913) : 1 male ( NMPC): Taiwan: Nantou County, Yushan National Park, Dongbu Scenic Area, Dong Bu , 5.4 km SE of Heshe, rotten banana trunks on the margin of a village, 23.5610°N 120.93044°E, 15.v.2018, M. Fikáček, W.- R. Liang, H.-C. Liu & Y. Minoshima lgt. (2018-TW33) .

Karyotype: 2 n = 32. The material to hand is from the testis and some nuclei at least, particularly that in Figure 15J , appear to be first of meiotic metaphase I and exhibit 16 bivalents. The karyotype hence likely comprise 15 pairs of autosomes plus Xy sex chromosomes.

TRIBE SPHAERIDIINI

Figures

Figure15. KaryotypesoftheCoelostomatiniand Protosternini.A–C,Coelostomaorbiculare,embryo(A,with B-chromosomes; B–C, without B-chromosomes). D–F, Dactylosternum flavicorne, embryo. G, Dactylosternum corbetti, mitosis, midgut. J–K, Protosternum abnormale, meiotic nuclei from testes. A–F, J, K, without treatment. G, C-banded. Habitus figures: (H) Coelostoma orbiculare; (I) Dactylosternum corbetti; (L) Protosternum abnormale, from Fikáček et al. (2018).