THE Australian share market has opened lower. At 1010 AEDT on Thursday, the benchmark S&P/ASX200 index was down 20.3 points, or 0.41 per cent, at 4,974.7, while the broader All Ordinaries index was down 19.5 points, or 0.39 per cent, at 4,987.5. On the ASX 24, the June share price index futures contract was down 25 points at 4,979, with 5,002 contracts traded.