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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.
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
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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.
The genus Oligobrachia has evolved specialized cells that provide a habitat for the endosymbiotic bacteria on which the tube worm relies for survival. Depending on the habitat where Oligobrachia resides—whether near a hydrothermal vent or an undersea volcano—the endosymbiotic bacteria oxidize methane , sulfide , or other dominant chemicals ...
Dorsal view, removed from water. Aphrodita aculeata, the sea mouse, is a marine polychaete worm found in the North Atlantic, the North Sea, the Baltic Sea and the Mediterranean.
It is the sister group of Errantia. [1] Sedentaria are mainly found within marine environments that have low oxygen levels and are specially adapted to these low oxygen environments by increasing gill surface area and having high-affinity respiratory proteins. Furthermore, they go through a process of metabolic depression which lowers their ...
Schizogamy where atoke is formed from division of the organism into sexual and asexual parts. Asexual reproduction to produce buds from its posterior end. Each bud into an epitoke and once fully formed, will then break off from atoke and become free swimming. Epigamy is the other method of morphological modifications.