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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
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 ...
Bearded fireworm Bearded fireworm from the Mediterranean. Bearded fireworms are usually 15 cm (6 inches) in average length, but can reach up to 30 cm (12 inches). [1] [2]At first glance, this fire worm looks like a centipede with its elongated and flattened appearance, multiple segments, white silks, and parapodia and gills located on the side of its body.
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.
[1] [2] It ranges in length from less than 10 cm (4 in) to 3 m (10 ft). [3] Its exoskeleton displays a wide range of colors, from black to purple and more. This species is an ambush predator; it hunts by burrowing its whole body in soft sediment on the ocean floor and waiting until its antennae detect prey. [ 4 ]
The water is drawn in through the anterior end and expelled through the posterior end, [1] passing through the fine mesh of the mucus bag where food particles get trapped. The mucus bag is later rolled up and passed by a conveyor belt of whipping hairs in the ciliated dorsal groove [ 2 ] to the mouth where it is swallowed whole. [ 3 ]
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.