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Errantia is a diverse group of marine polychaete worms in the phylum Annelida. Traditionally a subclass of the paraphyletic class Polychaeta, [4] it is currently regarded as a monophyletic group within the larger Pleistoannelida, composed of Errantia and Sedentaria. [2] These worms are found worldwide in marine environments and brackish water.
A few species have no larval form, with the egg hatching into a form resembling the adult, and in many that do have larvae, the trochophore never feeds, surviving off the yolk that remains from the egg. [4] However, some polychaetes exhibit remarkable reproductive strategies. Some species reproduce by epitoky. For much of the year, these worms ...
Pleistoannelida is a group of annelid worms that comprises the vast majority of the diversity in phylum Annelida.Discovered through phylogenetic analyses, it is the largest clade of annelids, comprised by the last common ancestor of the highly diverse sister groups Errantia and Sedentaria (Clitellata and related polychaetes) and all the descendants of that ancestor.
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Sandworms eat seaweed and microorganisms. Sandworms are known to be omnivores. Their diet consists of surface sediment, plant and animal remains. They are oftentimes exposed to metals through their diet and their burrowing tactics. [5] They have many distinctive traits, including: often reaching great lengths, sometimes exceeding four feet
Members of the Phyllodocidae are characterised by an eversible pharynx and leaf-like dorsal cirri.The head has a pair of antennae at the front, a pair of ventral palps and a single median antenna known as a "nuchal papilla".
Arctonoe is a genus of worms in the family Polynoidae.They are commonly known as "scale worms". Members of this genus predominantly occur in shallow (50 metres or less) waters of the north-eastern Pacific Ocean and often live as commensals of other marine invertebrates, frequently echinoderms but sometimes molluscs or other polychaetes.
Polynoidae is a family of marine Polychaete worms known as "scale worms" due to the scale-like elytra on the dorsal surface. Almost 900 species are currently recognised belonging to 9 subfamilies and 167 genera. [1]