Copecod Cyclops Ostracod Copecod Diiaptomus
Cyclops . Two caudal appendages project from the rear. Although they may be difficult to observe, Cyclops has five pairs of legs. The long first antennae are used by the males for gripping the females during mating. Afterwards, the female carries the eggs in two small sacs on her body. The larvae, or nauplii, are free-swimming and unsegmented.
Diaptomus is a copepods with a single eye . It is superficially similar in size and appearance to Cyclops. However it has characteristically very long first antennae that exceed the body length. In addition, the females carry the eggs in a single sac rather than the twin sacs seen in Cyclops. It is a copepod of larger freshwater lakes and still waters. Eudiaptomus gracilis is the most commonist in the UK but is probably overlooked. This was discovered in Withins Reservoir whichever species it is.
Ostracods are small crustaceans, typically around 1 millimetre in size.. Their bodies are flattened from side to side and protected by a bivalve-like, "shell". The hinge of the two valves is in the upper (dorsal) region of the body
All found in Withins Reservoir
Horse Leech - Haemopis sanguisuga Despite size cannot bite mamals, They feed on smaller animals such as midge larvae and snails but sometimes move onto land in search of earthworms. They are very sensitive to chemical traces in the water and find their prey this way. Found Canal
Fish Leech (Piscicola geometra) Very common strong swimming and can smell freshwater fish which it then swims towards to feed. Lays its eggs on the bottom with a 30 daty life cycle.
Theromyzon tessulatum Duck Leech common It crawls into the nostrils, mouth and respiratory tracks of waterfowl and can cause much misery.
Crangonyx pseudogracilis American Fresh Water Shrimp A visitor that likes still water very widespread. Identidfied bu smoth lower rear segmentd Urosome and differences in rear dorsal projections
Gammarus pulex British Fresh Water Shrimp. Often found in running water like these from Elton Res Feeder. Identidfied bu slightly hairy lower rear segmentd Urosome and differences in rear dorsal projections
Other Fleas found around Elton
bosima longirostris water flea spenmoor
Daphnia cuculata water flea, Elton Reservoir
Daphnia pulex occurs in a wide range of aquatic habitats, although it is most closely associated with small pools. Most common water flea.It can change in response to the presence of predators. Chemicals released by the larvae of the phantom midge Chaoborus induce the development of small jagged protrusions on the head for defence.
eurycerus (lamellatus ?) Large round chap. hangs on algae threads or sits in the bottom. Common food of tufyted ducks
diaphanosoma (Brachyurum?) The little dark coulered guy.Found around elton. common and feeds on other small animals and bacteria
scapholeberis mucronata Water flea lives on the surface hence it appears back tomfdront compaired tomother species. Only found in one loctaion in a pond on Spenmoor. Not reporte widely.
Dendrocoelum lacteum Milky Flatworm , This flatworm can be over 2cm in length and is very sticky due to the mucus it produces to help it glide and also to put off potential predators. Feeds on crustacians
Dugesia lugubris/polychroa flatworm canal
Polycelis tenuis/nigra Fresh Water Flatworm very common flatworms are found in freshwater habitats and are hermaphradates. ID in part via head shape
lumbriculus variegatus worms spenmoor ponds live in shallow water marshes, ponds, and swamps, feeding on microorganisms and organic material. Mature individuals are are. Reproduce by splitting
Oligochaeta Segmented see through worm x 3 huge genus these found in still water
Water Mites Tentative IDs. Very common in all water bodies around Elton reservoir. They are preditory.
lesser water boatman Corixa punctata They feeds on algae and dead plant material. They have long hind legs which they use to swim at the top of water, They breathe oxygen by trapping air beneath their wing cases when they are on the surface
Water boatman, common backswimmer Notonecta glauca swims upside-down, propelled by long legs like oars.they rest on the surface of the water sensing vibrations, and dive to investigate. When the boatmen are near their prey they can begin to track it using their eyesight. They kill the prey by jabbing it with its rostrum (feeding tube) and injecting its toxic saliva. They bite.
Water Louse - Asellus aquaticus very common in the bottom of water bodies in leaf matter.
Pond skater, common water-strider Gerris lacustris Pond skaters float on the surface of water sensing vibrations of an insect that accidentally falls into the water. The pond skater will dart across the surface of the pond to catch the stricken insect. Pond skaters also hunt other surface-dwelling insects including nymphs of their own species.
Water Measurer - Hydrometra stagnorum Ditches, ponds and slow moving streams. The adult moves slowly across the water surface in search of prey, lying just below, or in the surface film, it feeds on mosquito larvae and water fleas . common found Elton res and in cheeseden valley
Water Cricket - Velia caprai Still and slow moving water, streams and ponds. The eggs are laid in long rows on floating plants and are found in May and June, nymphs from June to August. Adults feed on various small insects that have died and fallen into the water. Five larval stages, and two or three generations a year have been observed