Ellis (nee Hinds) followed her bronze medal in the team pursuit with a brilliant ride to win the final sprint in the 25km points race. Her performance capped a superb week for the New Zealanders with further five performances in the top eight, along with medals in the men's individual pursuit (Jesse Sergent, silver), men's (bronze) and women's team pursuit and women's points race.
This is one more medal than the previous best of three, gained in Poland last year.
New Zealand won 11 medals at the world track championships from the first by Harry Kent in 1970 until 2008 but a further seven in the last two years as a testament to gains made since.
"We are naturally delighted and excited by the performances this week," BikeNZ high performance director Mark Elliott said.
"The team came here with high expectations and knowing they had done the work to be competitive.
"Tonight was the icing on the cake and a terrific performance from Lauren. As well as the medallists in the endurance events, we are really pleased with the emergence of our sprinters. They are a very young group and to have top 10 performances in each of their disciplines and go so close to a medal in the kilo and team sprint was encouraging.
"The pursuiters are pleased but at the same time they know that it was not perfect for them. They set such high expectations of themselves now that they are not satisfied now just with a bronze medal. They want to change the colour of their medals going forward to gold by the time they hit London in 2012."
Elliott said most of the team will now have a break, with some heading to their professional road teams, before their build-up towards the Commonwealth Games in October now buoyed with a belief that there are a number of medal prospects in the squad.
Ellis set the seal on things with her silver medal today.
She positioned herself near the front of the bunch staying out of danger and pushing to lead a group of five who took a lap on the field early in the 25km race. She attacked again mid-race and then recovered to win the final sprint which elevated her to the silver medal behind Canada's Tara Whitten.
"I knew I had to be aggressive. That was the plan tonight and it paid off," Ellis said.
"It worked out when we managed to take a lap so early. I sat in to recover and went again. I was shattered but knew I had to make one more big effort in that last sprint.
"I told myself that I could put my feet up for three weeks after this so I pushed one more time. It was so hard but it worked out perfectly.
"It's a real thrill. To come here and get two medals and a world record (team pursuit( is incredible. It is right up there for me.
"I am very excited now looking ahead to the Commonwealth Games. That's the big goal for me now and this is a good platform looking forward to New Delhi."
Auckland's Myron Simpson, the only other New Zealander on the track today, finished 10th in the men's omnium, with personal bests in the 200m time trial, individual pursuit and kilo time trial.
Most of the New Zealand team return home on Wednesday (NZ time).
Results:
Women's 25km points race: Tara Whitten (Canada) 36 pts 1, Lauren Ellis (NZ) 33 2, Tatsiana Sharakova (Belarus) 33 3.
Men's Omnium: Ed Clancy (Great Britain) 1, Leigh Howard (Australia) 2, Taylor Phinney (USA) 3. Also: Myron Simpson (NZ) 10.
