Errantians are named after the presence of many chaetae on their bodies. The chaetae are born on paddle-like projections called parapodia.
Errantia, every so often Aciculata, is a subclass of polychaete worms. These worms are distributed all over the world especially in marine habitats as well as brackish water.
Polychaetes are usually marine worms belonging to Phylum Annelida. They can occasionally be bright in color, and might be iridescent or even luminescent.
Each segment on the body of these worms carries a pair of paddle-like projections called as parapodia. These projections are used for movement, and also in a few species, serve as the worm's primary respiratory surfaces.
Bunches of bristle-like structures known as chaetae, extend from the parapodia, which are composed of chitin.
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