Berosus, LEACH, 1817

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 BEROSUS LEACH, 1817

Comments on karyotypes: Shaarawi & Angus (1991a) published the karyotype data of three species of the subgenus Berosus [ Berosus affinis Brullé, 1835 , Berosus luridus (Linnaeus, 1761) and Berosus signaticollis (Charpentier, 1825) ] and two species of the subgenus Enoplurus ( Berosus bispina Reiche & Saulcy, 1856 and Berosus fulvus Kuwert, 1888 ) and Angus et al. (1994) added Berosus (s.s.) hispanicus Küster, 1847 . The karyotype has 2 n = 16 + Xy p (♂), in all species except Berosus signaticollis which has an extra pair of autosomes 2 n = 18 + Xy p (♂). The karyotype of Berosus affinis may have an additional pair of B-chromosomes. The parachute configuration is shown by meiotic preparations of Berosus signaticollis . C-banding was not attempted; however, the chromosomes appear elongate and with small centromeric constrictions suggesting that the centromeric C-bands are small. Agarawal (1960b) presents data on mitosis and meiosis of Berosus (Enoplurus) indicus (Motschulsky, 1861) , providing the meioformula 8 + Xy p which agrees with newer data; the species identification by Agarawal (1960b) may be easily incorrect since no reliable identification key for Asian Berosus existed at that time.

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