The teenager, in his first year of a scholarship at the University of Florida, won the final, although slightly outside his heat time with a 54.81s effort.
"Tonight I wanted to go out to beat my heat time but didn't quite achieve that but I am so happy to get that qualifying time."
Dunedin father Kurt Crosland, 29, from the Neptune club, again pushed hard all the way to clock a personal best 54.88s which was of a second outside his dream of qualification for Glasgow.
However, the remarkable Sophie Pascoe added yet another world record to her long list when she clocked 31.62s in the 50m backstroke.
The Cantabrian, who has six Paralympic gold medals and five IPC world titles to her credit, was of a second inside her own previous world record.
US-based North Shore swimmer Glenn Snyders completed his clean sweep of all breaststroke events when he won the men's 50m final in 27.38s, which was 0.3s outside his own national record, but good enough for the third-fastest time in the world this year. This latest effort in the pool followed Snyders' qualifying performances in winning the 100m and 200m breaststroke titles with top swims earlier in the meeting.