Each mammilla forms from crystals radiating outward from an organic core until they touch neighboring mammillae and grow upwards into the next layer.
2.
The specific epithet " mammillaris " comes from the Latin " mammilla ", meaning " nipple ", with reference to the characteristic tubercles.
3.
The first species was described by Carl Linnaeus as " Cactus mammillaris " in 1753, deriving its name from Latin " mammilla ", " nipple ", referring to the tubercles that are among the distinctive features of the genus.
4.
In spherulitic eggs, the eggs of non-theropod dinosaurs, the eggshell units grow upward from their organic cores; the base of each eggshell unit is rounded, but is not a true mammilla because it does not have a distinct ultrastructure from the top of the unit.
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