In marine plankton many life stages of animals can be found. This is the larva of a barnacle, Balanus sp. It is called the 'nauplius stage' because it resembles the nauplius larva of a copepod. The barnacle larva can be distinguished by the horn-like projections.

Part of the Collection of the Center of Larval Development of the Micropolitan Museum © Wim van Egmond