cm, but typically is about 1.0-1.8 cm, with Southern Ocean individuals averaging largest. The smallest species, such as G. dracontovalis, typically reach 0.8-1.2 cm. Females grow larger than males.

Their body is suspended within a semi-translucent, globular carapace. Depending on the exact species, living individuals typically are orange, orange-red or violet-red, but they can also be colourless.Specimens preserved in alcohol become whitish. Calcium carbonate