The female carries 20–200 eggs under the side flaps of her abdomen, where they take 3–4 months to hatch. Over this time, male sperm production corresponds with females' reproductivity. Once hatched, juvenile koura cling to their mother's abdomen using their pincers to attach until they have reached a length of .
The female bears 20–200 eggs beneath the side flaps of her abdomen, where they take 3–4 months to hatch. Concurrently, male sperm production synchronizes with females' reproductive capacity. Once hatched, juvenile koura adhere to their mother's abdomen using their pincers until they have attained a specified length.