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Swima bombiviridis is a worm species that lives in the deep ocean. [2] It is also known as the green bomber worm or bombardier worm.This deep ocean pelagic (free-swimming) annelid has modified bioluminescent gills that can be cast off from an individual.
Many annelids move by peristalsis (waves of contraction and expansion that sweep along the body), [8] or flex the body while using parapodia to crawl or swim. [39] In these animals the septa enable the circular and longitudinal muscles to change the shape of individual segments, by making each segment a separate fluid-filled "balloon". [8]
Polychaeta (/ ˌ p ɒ l ɪ ˈ k iː t ə /) is a paraphyletic [1] class of generally marine annelid worms, commonly called bristle worms or polychaetes (/ ˈ p ɒ l ɪ ˌ k iː t s /).Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin.
An image plate showing the different anatomical features (dashed outline) of a representative annelid parapodium. Parapodium is from Lepidonotus oculatus and is a Museums Victoria specimen. Microscope photograph of a parapodium from a specimen of Arctonoe sp. showing the internal acicula that support the two lobes of the parapodium. This ...
With enlarged parapodia, they swim to the surface of the water where both sexes release gametes, and then die. The first stage in many forms of bloodworm is a zooplanktonic stage followed by the benthic instar where the familiar segmented red larvae develop protected by silk tubes made in the bottom silt. These larvae progress from tiny pale ...
Alitta succinea (known as the pile worm, clam worm or cinder worm) [3] is a species of marine annelid in the family Nereididae (commonly known as ragworms or sandworms). [4] It has been recorded throughout the North West Atlantic, as well as in the Gulf of Maine and South Africa .
Like most annelids, with a few exceptions like Sipuncula, Echiura and Diurodrilus, [27] the leech is a segmented animal, but unlike other annelids, the segmentation is masked by secondary external ring markings . [28] The number of annulations varies, both between different regions of the body and between species. [24]
The family comprises marine annelids distributed in diverse benthic habitats across Oceania, Europe, South America, North America, Asia and Africa. [1] The Eunicid anatomy typically consists of a pair of appendages near the mouth ( mandibles ) and complex sets of muscular structures on the head ( maxillae ) in an eversible pharynx . [ 2 ]