Hydaticus
transversalis
Range & Status
Extant populations centred on the Somerset Levels, Norfolk Broadland and a few other fen sites in England, also the Gwent Levels. Foster (1985) provides a national distribution map.
Regional Distribution
There is a single record in the 1960' s from a water tank at Peninnis Head, St. Mary' s (Mackechnie-Jarvis, 1969).
Habitat & Ecology
Most frequently associated with ditches in grazing levels that are rich in emergent and submerged macrophyte vegetation.
Threats
Loss of habitat through drainage and agricultural improvement, lowering of water tables through water abstraction schemes (may not be relevant to the Isles of Scilly).
Conservation
None.