Haliplus

Abstract: 1. A population of Enochrus bicolor (Fabricius) was monitored over a 4-year period (March 1997–March 2001) from a coastal brackish pool in S.E. Essex. This water beetle, together with Ochthebius marinus (Payk.), O. viridis Peyrhiff, O. punctatus Steph., Hygrotus parallelogrammus (Ahrens), Berosus affinis Brulle, Agabus conspersus, (Marsham), Rhantus frontalis (Marsham), R. suturalis (MacLeay), Paracymus aeneus (Germar), and Haliplus apicalis Thompson, are all taxa of conservation interest. 2. Enochrus bicolor was present in most months, with greatest adult abundances being recorded in August and September each year. 3. During the study period salinity values ranged from 4.7 ppt (parts per thousand) to 62.6 ppt. 4. Correlation analysis and the development of regression models indicated that the highest abundances of E. bicolor coincided with maximum water temperature in the late summer–early autumn. However, when the natural seasonal signal was removed by standardizing the series, a relatively weak association with the relative abundance of E. bicolor and conductivity was observed. 5. The conservation of E. bicolor and other organisms associated with brackish water habitats subject to irregular marine inundation is considered. Copyright © 2002 John Wiley & Sons, Ltd.

Abstract: the subgenera: Haliplus s. str., Neohaliplus Netolitzky, 1911, Haliplidius Guignot, 1928, Liaphlus Guignot, 1928, Paraliaphlus Guignot, 1930 and Phalilus Guignot, 1935. The species assigned to the so-called ruficollis group are placed in the subgenus Haliplus s.str, because Dytiscus impressus Fabricius, 1787 [a junior objective synonym of Haliplus ruficollis (De Geer, 1774)] is here selected as type species for the genus Haliplus Latreille, following Holmen (1987).