Adapted for the purpose of swimming.

The earliest stage in the development of many Crustacea, especially belonging to the lower groups. In this stage the animal has a short body, with indistinct indications of a division into segments, and three pairs of fringed limbs. This form of the common freshwater Cyclops was described as a distinct genus under the name of Nauplius .

The arrangement of the veins or nervures in the wings of insects.

Imperfectly developed females of certain social insects (such as ants and bees), which perform all the labours of the community. Hence, they are also called Workers .