New Zealand's performance in the relay has earned them an invitation for next year's Olympics with a second qualifying time required at the trials next March to secure a berth for London.
The time of seven minutes, 57.15 seconds for the quartet was inside the previous record they set in Delhi, and was set up with a brilliant lead-off swim from Boyle.
The outstanding North Shore club swimmer was second fastest after her opening leg, clocking 1m 57.74s, which was just 2/100ths off the national 200m freestyle record she set two days ago in the individual event.
It was bettered only by the Americans who raced away to establish the fastest qualifying time of 7m 50.66s, from the fast improving Canada who closed with a stunning 1m 56.89s from Barbara Jardin.
The New Zealand performance was supported with a 2m 00.68s from Marshall, 1m 59.67s from Gessler and 1m 59.06s from Hind.
Snyders made it three straight semifinal qualifications in the breaststroke disciplines when he was the 10th fastest qualifier in yesterday morning's heats. The North Shore swimmer clocked 2m 12.38s which was half a second faster than his season best and considerably faster than his time in the finals at the Delhi Commonwealth Games.
- NZPA