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The commonest small black/grey sprintail in Britain is Anurida maritima. As far as I can find out from a Google search, Pseudanurida spp are more likley to be found in Australian waters. What features suggested Pseudanurida?
whoops shouldn't be that one, not sure how that happened!
Lat/Lng: 55.5357, -5.351
OS grid ref: NR886319