Elongate striped spider without a web, waiting for prey on umbel flowerhead.
No interactions present.
Yes, the taxonomists would insist on the genitalia being inspected for absolute confirmation, but I think T. oblonga is most likely based on location, habitat and date. T. maritima is not strictly coastal but there seem to be few records so far inland (Wiltshire). T. maritima also seems to much prefer damp habitats, while this was on a dry south facing chalk grassland slope (more typical habitat for T. oblonga which inhabits dry as well as damp locations), and T.maritima is mostly found in May/June, and T.oblonga is more often found into August/September. This was recorded mid August in a year when most inverts were ahead of schedule. I agree the ID may not be definite, but between the two oblonga seems most likely - especially based on habitat - from what I can discover. eg http://srs.britishspiders.org.uk/portal.php/p/Summary/s/Tibellus%20marit... http://srs.britishspiders.org.uk/portal.php/p/Summary/s/Tibellus%20oblongus
Nick Upton, naturalist and photographer.
but I think iSpot guidelines say (somewhere) that an ID that is definitely correct is preferable to a narrower ID that only might be
Yes the ispot approach is sensible and I agree it goes down formally as Tibellus sp. now I know that there is another very similar looking species thanks to your comment. But I still think it's "most likely" to be T.oblongus based on the other factors!
Lat/Lng: 51.4079, -2.2357
OS grid ref: ST837676