Goniocidaris umbraculum is a species of cidaroid sea urchin that inhabits the continental shelf off the southern coasts of New Zealand.

Prior to research into its breeding biology, only two other sea urchins that brood their young had been studied, Cassidulus caribaearum and Abatus cordatus, though several arctic and subarctic species were known to do so.

They are then moved to the peristome, a process that takes several minutes and is achieved by the action of the tube feet and cilia, the eggs being guided along channels between the spines; the peristome becomes slightly depressed in order to accommodate the eggs, which are retained by the spines surrounding the mouth for about two months.

[2] Sixty eggs can be held in place, and when the juveniles have developed tube feet, they move to other parts of the test, but continue to be brooded for another two months.

This unusual reproductive strategy may have developed when this species evolved to live in the colder waters further south than other members of its genus.