Polychaete worms
Polychaetes, or bristle worms, are a very common and diverse class of worms with over 10,000 species described so far. Commonly overlooked, these mostly marine worms can be brightly coloured and are to be found in tubes and burrows in the sand and mud of the beach to the depths of the ocean or even just free-living in the water. They all have bristles on their segmented bodies - in fact 'polychaeta' means 'many bristles'. They come in an impressive range of sizes from just 1mm to 3m long.
Order
Bristle-footed worms (Canalipalpata)Canalipalpata are an order of the marine polychaete worms. Species in this order are mostly filter feeders owing to a lack of teeth.
About
The Polychaeta or polychaetes are a class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. Indeed, polychaetes are sometimes referred to as bristle worms. More than 10,000 species are described in this class. Common representatives include the lugworm (Arenicola marina) and the sandworm or clam worm Nereis.
Polychaetes as a class are robust and widespread, with species the live at the coldest temperatures which occur in the oceans on the coldest abyssal plain, to forms which tolerate extreme high temperatures near hydrothermal vents. Polychaetes occur throughout the Earth's oceans at all depths, from forms that live as plankton near the surface, to a 2–3 cm specimen (still unclassified) observed by the robot ocean probe Nereus at the bottom of the Challenger Deep, the deepest spot in the Earth's oceans.
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Elsewhere on the web
- Polychaete worm fossils (fossilmuseum.net)
- Polychaete identification (nhm.ac.uk)
- The Australian Museum: fact sheet and forumPolychaete worm fossils (seaslugforum.net)
- An introduction to the polychaete (ucmp.berkeley.edu)
- Polychaete (wikipedia.org)
Site links
BBC links
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