metanauplius

A metanauplius is a larval stage in the life cycle of certain crustaceans, particularly those belonging to the order Copepoda. It is a post-naupliar stage that follows the nauplius larva. The metanauplius stage is characterized by the development of additional appendages compared to the simpler nauplius. Specifically, it typically possesses the first three pairs of antennae, mandibles, and maxillae, as well as developing thoracic appendages, which are absent in the nauplius. The body shape of the metanauplius also begins to elongate. This stage represents a significant step in the post-embryonic development of these crustaceans, transitioning towards the more complex adult form. The duration of the metanauplius stage varies depending on the species and environmental conditions. Following the metanauplius, further larval instars, such as copepodites, will appear, each with increasing numbers of segmented body parts and appendages. The understanding of these larval stages is crucial in crustacean biology and ecology, aiding in species identification and the study of life history patterns.