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Amphinomida
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Amphinomida

annelid order
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The Amphinomida are a free-moving order of marine worms belonging to the class Polychaeta, within the phylum Annelida. These segmented worms are characterized by their prostomium, which has one to five antennae, two palpi, and a caruncle. Their parapodia, which are paired lateral appendages, have two lobes and branchiae (gills). Amphinomida vary in size, ranging from 0.5 to 35 cm. Examples of genera within this order include Eurythoe, commonly known as fireworms, and Euphrosyne. Polychaetes, as a whole, are marine worms known for their distinct body segmentation and, in most species, a pair of parapodia with bristles on each segment.12

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4 Britannica Sources
  1. polychaete
  2. annelid - Annotated classification
  3. Gymnophiona
  4. amphipod

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