Phylum: Annelida. Class: Polychaeta Grube, Groups included. Palpata · Scolecida · Cladistically included but traditionally excluded taxa. Chaetopteridae. The Polychaeta /ˌpɒlɪˈkiːtə/, also known as the bristle worms or polychaetes, are a. Annelida. Class: Clitellata. Order: Oligochaeta. Family: Naididae. Subfamily: Tubificinae. Genus: Tubifex. Lamarck, Tubifexjpg. Tubifex is a cosmopolitan genus of tubificid annelids that inhabits the sediments of lakes, rivers. PENGERTIAN KLASIFIKASI ANNELIDA 1. Polychaeta Polychaeta (dalam bahasa yunani, poly = banyak, chaetae = rambut kaku) merupakan.
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Tubifex can be easily cultured on mass scale in containers with to mm thick pond mud at the bottom, blended with decaying vegetable matter and masses of bran and bread. Aphrodita aculeata Linnaeus, Conversely, some species have little or no circulatory system at all, transporting oxygen in the coelomic fluid that fills their body cavities.
The English name may either have a similar meaning, or may derive from the supposed resemblance to a bedraggled mouse when washed up on shore. The name of the genus is taken from Aphroditethe Ancient Greek goddess of love.
Unsourced material may be challenged and removed. Oligochaeta, Tubificidae with a preliminary reappraisal of the genus”. The body also contains greenish “chloragogen” tissue, similar to that found in oligochaeteswhich appears to function in metabolism, in a similar fashion to that of the vertebrate liver. Please help improve this article by adding citations to reliable sources.
Retrieved from ” https: The mouth of polychaetes is located on the peristomiumthe segment behind the prostomiumand varies in form depending on their diets, since the group includes predators, herbivores, filter feeders, scavengers, and parasites.
Polychaetes have a varying number of protonephridia or metanephridia for excreting waste, which in some cases can be relatively complex in structure.
In general, however, they possess a pair of jaws and a pharynx that can be rapidly everted, allowing the worms to grab food and pull it into their mouths. Oligochaeta of North America”. Being soft-bodied organismsthe fossil record of polychaetes is dominated by their fossilized jaws, known as scolecodontsand the mineralized tubes that some of klazifikasi secrete. The front half, the atoke, is asexual.
Polychaetes occur throughout the Earth’s oceans at all depths, from forms that live as plankton near the surface, to a 2- to 3-cm specimen still unclassified observed by the robot ocean probe Nereus at the bottom of the Challenger Deepthe deepest known spot in the Earth’s oceans.
The most common of these is haemoglobinbut some groups have haemerythrin or the green-coloured chlorocruorininstead. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetaewhich are made of chitin.
Most burrow or build tubes in the sediment, and some live as commensals. Some have even evolved cutaneous invaginations for aerial gas exchange. They have been a popular food for the aquarium trade almost since its inception, and gathering them from open sewers for this purpose was quite common until recently. After the arrangement of the system, the container is inoculated with Tubifex worms which can be obtained from nearby muddy canals or sewage canals.
Each of the epitoke segments is packed with eggs and sperm and features a single eyespot on its surface. This risk can be partially solved by keeping the worms under brisk running water until they have voided the contents of their digestive systems.
From Wikipedia, the free encyclopedia. Bundles of bristles, called setaeproject from the parapodia. Some polychaetes exhibit remarkable reproductive strategies.
A few are parasitic. Once mature, the gametes are shed into the surrounding water through ducts or openings that vary between species, or in some cases by the complete rupture of the body wall and subsequent death of the adult.
The effect is produced by many hexagonal cylinders within the spines, which “perform much more efficiently than man-made optical fibres “. The gonads shed immature gametes directly into the body cavity, where they complete their development. The most generalised polychaetes are those that crawl along the bottom, but others have adapted to many different ecological nichesincluding burrowing, swimming, pelagic life, tube-dwelling or boring, commensalismand parasitismrequiring various modifications to their body structures.
Retrieved 24 December The penial setae of one worm penetrate into the tissues of other worm and thus the conjugants are held together. Older classifications recognize many more sub orders than the layout presented here. In addition to the sensory organs on the head, photosensitive eye spots, statocystsand numerous additional sensory nerve endings, most likely in involved with the sense of touch, also occur on the body.
This page was last edited on 15 Decemberat Soon, the Tubifex worm withdraws its body from the egg case by its backward wriggling movements.
Views Read Edit View history. The two main blood vessels furnish smaller vessels to supply the parapodia and the gut. This is because, when viewed ventrally, the animal resembles a human female’s genitalia.
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The Pogonophora and Vestimentifera were once considered separate phyla, but are now classified in the polychaete family Siboglinidae. Estonian Journal of Earth Sciences. The rear end of the worm develops into a “stolon” containing the eggs or sperm, and this stolon becomes detached from the parent worm, and rises to the sea surface where fertilisation takes place.