A METHOD OF QUALITATIVE BIOLOGICAL RIVER SURVEY 263
Glossophonia complanata (vf)
Helobdella stagnalis (r)
Erpobdella octoculata (a)
Order Oligochaeta
Eiseniella sp. (r)
Tubifex spp. (vf)
Lumbriculus variegatus (r)
Lumbricillis spp. (r)
Phylum Arthropoda
Class Insecta
Order Ephemeroptera sp. (r)
Order Hemiptera
Corixa sp. (f)
Order Trichoptera (i)
Order Coleoptera
Haliplus sp. Cr)
Deronectes sp. (r)
Order Diptera
Chironomous sp. (a)
Simulium sp. (vf)
Class Crustacea
Order Isopoda
Asellus aquaticus (r)
Order Amphipoda
Gammarus pulex (a)
Class Arachnida
Hydracarina sp. (r)
Phylum mollusca
*Bithynia tentaculata
*Valvata piscinalis
*Limnea auricularia
L. pereger (r)
*Planorbis spirorbis
*P. vortex
*P. albus
*P. carinatus
P. planorbis (r)
Ancylus lacustris (a)
Sphaerium sp. (r)
Pisidium sp. (r)
Phylum Pisces
Nemacheilus barbatula (a)
Gasterosteus aculeatus (r)
*These mollusca were found in the riffle but were not living specimens. 1 record
them as a matter of interest.