217
THE SPIDERS OF SUFFOLK
Entelecara omissa A characteristic but rare species of fens in eastern England. Icklingham Poors F e n , Lakenheath Poors Fen, Redgrave Fen and Sandy L a n e Marsh, Dunwich. Hypomma fulvum A small erigonid restricted to fens in eastern England. H o p t o n F e n , Dunwich Common Marsh and Fiatford Mill. Gongylidiellum murcidum A minute species recorded mainly from fen habitats in southern Britain. In Suffolk only known from Redgrave Fen. T h e r e is a number of species of wet places generally which are of some interest. A m o n g them the following have been recorded from Suffolk: Walckenaera Tmecticus Baryphyma
vigilax affinis
Icklingham Poors Fen. ButleyCreek.
pratensis
Cavenham Heath, saltmarshes at Fiatford Mill.
Saloca diceros Icklingham Poors Fen, Pashford Poors Fen, Dunwich. Usually in wet deciduous litter. Notioscopus Erigonella
sarcinatus ignobilis
Redgrave Fen. Icklingham Poors Fen, Pashford Poors Fen.
Floronia bucculenta Walberswick Common Marsh; Fen Hill, Dunwich; Sandy L a n e Marsh, Dunwich; Minsmere; Upper Hollesley Common; Dodnash W o o d ; Ten W o o d ; Redgrave Fen. Taranucnus setosus Barnby Broad; Easton Broad; Fen Hill Marsh, Walberswick; Sandy Lane Marsh, Dunwich; Minsmere; Icklingham Poors Fen; Redgrave F e n .
3. Maritime habitats. T h e r e are about 30 British spiders which are restricted to coastal habitats of which 21 have been recorded in Suffolk. Only five of these appear to have an eastern distribution in Britain. Among the 21 species mentioned seven are from saltmarshes, seven from shingle and shoreline habitats, six from sand dunes and one from both shingle and dunes. A useful account of the biology and ecology o f spider populations of dunes is given by Duffey (1968), based largely on work done in the Gower, S. Wales, but we lack similar studies of saltmarsh or shingle habitats. A number o f species from coastal habitats have been recorded from Essex and Norfolk but not, so far, from Suffolk. They include the small salticid Heliophanus auratus, known only from Colne Point, Essex and also Clubiona similis, Trichopterna cito and Ceratinopsis romana any o f which may yet be found in suitable habitats in Suffolk. Species of particular interest from Suffolk include: SALTMARSH SPECIES
A rgenna patula A species recorded from some ten coastal sites from Lancs. southwards. Havergate Island and the Stour estuary.
Trans.
Suffolk
Nat. Soc.
18 part 3.