Shot putter Jacko Gill heads a 12-strong New Zealand team to compete at July's world junior athletics championships in Spain.

The current world junior and world youth champion holds 12 age group world records but is keen to eclipse the world record in the 18 and 19 years age group of 22.73m currently held by world senior champion David Storl of Germany.

He's concentrating on this event before heading to compete at the London Olympics.

Three athletes have been named in the women's discus but only two will compete. A decision will be made following the athletes' participation in pre-championship events in Europe.

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New Zealand team to compete at the world junior athletics championships in the Olympic Stadium, Barcelona, from July 10-15:

Kodi Harman (Waikato BOP) 100m and 200m, Andrew Whyte (Otago) 400m, Brad Mathas (Manawatu Wanganui) 800m, Julian Oakley (Waikato BOP) 800m and 1500m, Jacko Gill (Auckland) shot put, Rebekah Greene (Otago) 1500m and 3000m, Kerry Charlesworth (Auckland) pole vault, Siositina Hakeai (Auckland) discus, Leesa Lealaisalanoa (Auckland) discus, Merewarihi Vaka (Auckland) discus, Julia Ratcliffe (Waikato BOP) hammer, Portia Bing (Auckland) heptathlon.