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- Nemertea abstract "Nemertea is a phylum of invertebrate animals also known as \"ribbon worms\" or \"proboscis worms\". Alternative names for the phylum have included Nemertini, Nemertinea and Rhynchocoela. Although most are less than 20 centimetres (7.9 in) long, one specimen has been estimated at 54 metres (177 ft). Most are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many have patterns of yellow, orange, red and green coloration.The foregut, stomach and intestine run a little below the midline of the body, the anus is at the tip of the tail, and the mouth is under the front. A little above the gut is the rhynchocoel, a cavity which mostly runs above the midline and ends a little short of the rear of the body. All species have a proboscis which lies in the rhynchocoel when inactive but everts (turns inside-out) to emerge just above the mouth and capture the animal's prey with venom. A very stretchy muscle in the back of the rhynchocoel pulls the proboscis in when an attack ends. A few species with stubby bodies filter feed and have suckers at the front and back ends, with which they attach to a host.The brain is a ring of four ganglia, positioned around the rhynchocoel near its front end. At least a pair of ventral nerve cords connect to the brain and run along the length of the body. Most nemerteans have various chemoreceptors, and on their heads some species have a number of pigment-cup ocelli. These ocelli can detect light but can not form an image. Nemerteans respire through the skin. They have at least two lateral vessels which are joined at the ends to form a loop, and these and the rhynchocoel are filled with fluid. There is no heart, and the flow of fluid depends on contraction of muscles in the vessels and the body wall. To filter out soluble waste products, flame cells are embedded in the front part of the two lateral fluid vessels, and remove the wastes through a network of pipes to the outside.All nemerteans move slowly, using their external cilia to glide on surfaces on a trail of slime, while larger species use muscular waves to crawl, and some swim by dorso-ventral undulations. A few live in the open ocean while the rest find or make hiding places on the bottom. About a dozen species inhabit freshwater, mainly in the tropics and subtropics, and another dozen species live on land in cool, damp places. Most nemerteans are carnivores, feeding on annelids, clams and crustaceans. A few species are scavengers, and a few species live commensally inside the mantle cavity of molluscs. Some species have devastated commercial fishing of clams and crabs. Nemerteans have few predators. Two species are sold as fish bait.In most species the sexes are separate, but all the freshwater species are hermaphroditic. Nemerteans often have numerous temporary gonads (ovaries or testes), and build temporary gonoducts (ducts from which the ova or sperm are emitted), one per gonad, when the ova and sperm are ready. The eggs are generally fertilised externally. Some species shed them into the water, and others protect their eggs in various ways. The fertilized egg divides by spiral cleavage and grows by determinate development, in which the fate of a cell can usually be predicted from its predecessors in the process of division. The embryos of most taxa develop either directly to form juveniles (like the adult but smaller) or to form planuliform larvae, in which the larva's long axis is the same as the juvenile's. However, some form a pilidium larva, in which the developing juvenile has a gut which lies across the larva's body, and usually eats the remains of the larva when it emerges. The bodies of some species fragment readily, and even parts near the tail can grow full bodies.It has been suggested that three fossil species may be nemerteans, but none is confirmed. Traditional taxonomy divides the phylum in two classes, Anopla (\"unarmed\" – their proboscises do not have a little dagger) with two orders, and Enopla (\"armed\" with a dagger) with two orders. However, it is now accepted that Anopla are paraphyletic (have given rise to another group), as one order is more closely related to Enopla than to the other order of Anopla. The phylum Nemertea is monophyletic, whose synapomorphies include the rhynchocoel and eversible proboscis. Traditional taxonomy says that nemerteans are closely related to flatworms and that both are relatively \"primitive\" acoelomates. Now both phyla are regarded as members of the Lophotrochozoa, a very large \"super-phylum\" that also includes molluscs, annelids, brachiopods, bryozoa and many other protostomes.".
- Nemertea thumbnail Proboscis_worm.JPG?width=300.
- Nemertea wikiPageExternalLink index.html.
- Nemertea wikiPageExternalLink nemertea.lifedesks.org.
- Nemertea wikiPageExternalLink watch?v=SnkHY1CvfEA.
- Nemertea wikiPageID "43200".
- Nemertea wikiPageLength "55539".
- Nemertea wikiPageOutDegree "343".
- Nemertea wikiPageRevisionID "707678168".
- Nemertea wikiPageWikiLink Acoela.
- Nemertea wikiPageWikiLink Acoelomorpha.
- Nemertea wikiPageWikiLink Algae.
- Nemertea wikiPageWikiLink Amiskwia.
- Nemertea wikiPageWikiLink Anatomical_terms_of_location.
- Nemertea wikiPageWikiLink Animal.
- Nemertea wikiPageWikiLink Annelid.
- Nemertea wikiPageWikiLink Anopla.
- Nemertea wikiPageWikiLink Anus.
- Nemertea wikiPageWikiLink Archenteron.
- Nemertea wikiPageWikiLink Archisymplectes.
- Nemertea wikiPageWikiLink Argentinosaurus.
- Nemertea wikiPageWikiLink Arthropod.
- Nemertea wikiPageWikiLink Australasia.
- Nemertea wikiPageWikiLink Australia.
- Nemertea wikiPageWikiLink Azores.
- Nemertea wikiPageWikiLink Basal_(phylogenetics).
- Nemertea wikiPageWikiLink Basement_membrane.
- Nemertea wikiPageWikiLink Bathyal_zone.
- Nemertea wikiPageWikiLink Benthic_zone.
- Nemertea wikiPageWikiLink Bilateria.
- Nemertea wikiPageWikiLink Bivalvia.
- Nemertea wikiPageWikiLink Blue_whale.
- Nemertea wikiPageWikiLink Brachiopod.
- Nemertea wikiPageWikiLink Brain.
- Nemertea wikiPageWikiLink British_Isles.
- Nemertea wikiPageWikiLink Bryozoa.
- Nemertea wikiPageWikiLink Burgess_Shale.
- Nemertea wikiPageWikiLink Burrow.
- Nemertea wikiPageWikiLink Calcareous.
- Nemertea wikiPageWikiLink Calcium_phosphate.
- Nemertea wikiPageWikiLink Cambrian_Series_3.
- Nemertea wikiPageWikiLink Canary_Islands.
- Nemertea wikiPageWikiLink Carcinonemertes_errans.
- Nemertea wikiPageWikiLink Carnivore.
- Nemertea wikiPageWikiLink Category:Animal_phyla.
- Nemertea wikiPageWikiLink Category:Nemerteans.
- Nemertea wikiPageWikiLink Cellophane.
- Nemertea wikiPageWikiLink Central_nervous_system.
- Nemertea wikiPageWikiLink Cerebrum.
- Nemertea wikiPageWikiLink Chemoreceptor.
- Nemertea wikiPageWikiLink Chordate.
- Nemertea wikiPageWikiLink Cilium.
- Nemertea wikiPageWikiLink Circulatory_system.
- Nemertea wikiPageWikiLink Clade.
- Nemertea wikiPageWikiLink Cladistics.
- Nemertea wikiPageWikiLink Clam.
- Nemertea wikiPageWikiLink Class_(biology).
- Nemertea wikiPageWikiLink Cleavage_(embryo).
- Nemertea wikiPageWikiLink Coelom.
- Nemertea wikiPageWikiLink Commensalism.
- Nemertea wikiPageWikiLink Connective_tissue.
- Nemertea wikiPageWikiLink Crustacean.
- Nemertea wikiPageWikiLink Ctenophora.
- Nemertea wikiPageWikiLink Cuticle.
- Nemertea wikiPageWikiLink DNA.
- Nemertea wikiPageWikiLink Deerstalker.
- Nemertea wikiPageWikiLink Dermis.
- Nemertea wikiPageWikiLink Determinate_development.
- Nemertea wikiPageWikiLink Deuterostome.
- Nemertea wikiPageWikiLink Dicyemida.
- Nemertea wikiPageWikiLink Diffusion.
- Nemertea wikiPageWikiLink Dinosaur.
- Nemertea wikiPageWikiLink Diplodocus.
- Nemertea wikiPageWikiLink Doris_(mythology).
- Nemertea wikiPageWikiLink Dungeness_crab.
- Nemertea wikiPageWikiLink Ecdysis.
- Nemertea wikiPageWikiLink Ecdysozoa.
- Nemertea wikiPageWikiLink Echinoderm.
- Nemertea wikiPageWikiLink Echiura.
- Nemertea wikiPageWikiLink Egg_cell.
- Nemertea wikiPageWikiLink Embryo.
- Nemertea wikiPageWikiLink Emplectonema_neesii.
- Nemertea wikiPageWikiLink Enopla.
- Nemertea wikiPageWikiLink Entoprocta.
- Nemertea wikiPageWikiLink Epidermis_(zoology).
- Nemertea wikiPageWikiLink Epithelium.
- Nemertea wikiPageWikiLink Evolutionary_grade.
- Nemertea wikiPageWikiLink Family_(biology).
- Nemertea wikiPageWikiLink Filter_feeder.
- Nemertea wikiPageWikiLink Flame_cell.
- Nemertea wikiPageWikiLink Flatworm.
- Nemertea wikiPageWikiLink Fossil.
- Nemertea wikiPageWikiLink Frankfurt.
- Nemertea wikiPageWikiLink Ganglion.
- Nemertea wikiPageWikiLink Gastrotrich.
- Nemertea wikiPageWikiLink Gelatin.
- Nemertea wikiPageWikiLink Genus.
- Nemertea wikiPageWikiLink Geometer_moth.
- Nemertea wikiPageWikiLink Geonemertes.
- Nemertea wikiPageWikiLink Gill.