Along with Heterocypris incongruens, there some other Ostracoda types present, suggestion for an ID will be most welcome.
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The pattern on the small ones is rather like Cypridopsis vidua, but there are other species that have bars of colour. Are you sure they are not juveniles of Heterocypris? Not that I've ever seen such strongly patterned juveniles.
I have sent a request to Robin J. Smith, the guy who authors this site, http://www.lbm.go.jp/smith/index.html
Should I get any feed back I will let you know.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
How about picking out a few of the stripy ones, put them in a jar of water with a layer of soil and a bread crumb, and keep them on the windowsill. If they are just juvenile incongruens, they will mature in a week or two.
Lat/Lng: 53.2, -0.6
OS grid ref: SK9568