Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Chelicerata> ?p ?o }
- Chelicerata abstract "The subphylum Chelicerata (/kəˌlɪsəˈreɪtə/ or /kəˌlɪsəˈrɑːtə/; New Latin, from French chélicère, from Greek khēlē \"claw, chela\" and kéras \"horn\") constitutes one of the major subdivisions of the phylum Arthropoda. It contains the horseshoe crabs, sea spiders, and arachnids (including scorpions and spiders).The chelicerata originated as marine animals, possibly in the Cambrian period, but the first confirmed chelicerate fossils, eurypterids, date from 445 million years ago in the Late Ordovician period.The surviving marine species include the four species of xiphosurans (horseshoe crabs), and possibly the 1,300 species of pycnogonids (sea spiders), if the latter are indeed chelicerates. On the other hand, there are over 77,000 well-identified species of air-breathing chelicerates, and there may be about 500,000 unidentified species.Like all arthropods, chelicerates have segmented bodies with jointed limbs, all covered in a cuticle made of chitin and proteins. The chelicerate bauplan consists of two tagmata, the prosoma and the opisthosoma, except that mites have lost a visible division between these sections. The chelicerae, which give the group its name, are the only appendages that appear before the mouth. In most sub-groups, they are modest pincers used to feed. However, spiders' chelicerae form fangs that most species use to inject venom into prey. The group has the open circulatory system typical of arthropods, in which a tube-like heart pumps blood through the hemocoel, which is the major body cavity. Marine chelicerates have gills, while the air-breathing forms generally have both book lungs and tracheae. In general the ganglia of living chelicerates' central nervous systems fuse into large masses in the cephalothorax, but there are wide variations and this fusion is very limited in the Mesothelae, which are regarded as the oldest and most primitive group of spiders. Most chelicerates rely on modified bristles for touch and for information about vibrations, air currents, and chemical changes in their environment. The most active hunting spiders also have very acute eyesight.Chelicerates were originally predators, but the group has diversified to use all the major feeding strategies: predation, parasitism, herbivory, scavenging and eating decaying organic matter. Although harvestmen can digest solid food, the guts of most modern chelicerates are too narrow for this, and they generally liquidize their food by grinding it with their chelicerae and pedipalps and flooding it with digestive enzymes. To conserve water, air-breathing chelicerates excrete waste as solids that are removed from their blood by Malpighian tubules, structures that also evolved independently in insects. While the marine horseshoe crabs rely on external fertilization, air-breathing chelicerates use internal but usually indirect fertilization. Predatory species generally use elaborate courtship rituals to prevent males from being eaten before they can mate. Most lay eggs that hatch as what look like miniature adults, but all scorpions and a few species of mites keep the eggs inside their bodies until the young emerge. In most chelicerate species the young have to fend for themselves, but in scorpions and some species of spider the females protect and feed their young.The evolutionary origins of chelicerates from the early arthropods have been debated for decades. Although there is considerable agreement about the relationships between most chelicerate sub-groups, the inclusion of the Pycnogonida in this taxon has recently been questioned (see below), and the exact position of scorpions is still controversial, though they were long considered the most primitive (basal) of the arachnids.Although the venom of a few spider and scorpion species can be very dangerous to humans, medical researchers are investigating the use of these venoms for the treatment of disorders ranging from cancer to erectile dysfunction. The medical industry also uses the blood of horseshoe crabs as a test for the presence of contaminant bacteria. Mites can cause allergies in humans, transmit several diseases to humans and their livestock, and are serious agricultural pests.".
- Chelicerata thumbnail Horseshoe_crab_female.jpg?width=300.
- Chelicerata wikiPageID "50884".
- Chelicerata wikiPageLength "52188".
- Chelicerata wikiPageOutDegree "338".
- Chelicerata wikiPageRevisionID "697854609".
- Chelicerata wikiPageWikiLink Abdomen.
- Chelicerata wikiPageWikiLink Acari.
- Chelicerata wikiPageWikiLink Aglaspidida.
- Chelicerata wikiPageWikiLink Allergic_rhinitis.
- Chelicerata wikiPageWikiLink Allergy.
- Chelicerata wikiPageWikiLink Alzheimers_disease.
- Chelicerata wikiPageWikiLink Amblypygi.
- Chelicerata wikiPageWikiLink Ammonia.
- Chelicerata wikiPageWikiLink Antenna_(biology).
- Chelicerata wikiPageWikiLink Anus.
- Chelicerata wikiPageWikiLink Appendage.
- Chelicerata wikiPageWikiLink Arachnid.
- Chelicerata wikiPageWikiLink Artery.
- Chelicerata wikiPageWikiLink Arthropod.
- Chelicerata wikiPageWikiLink Asthma.
- Chelicerata wikiPageWikiLink Atelocerata.
- Chelicerata wikiPageWikiLink Atopic_dermatitis.
- Chelicerata wikiPageWikiLink Attercopus.
- Chelicerata wikiPageWikiLink Bacteria.
- Chelicerata wikiPageWikiLink Beekeeper.
- Chelicerata wikiPageWikiLink Biochemistry.
- Chelicerata wikiPageWikiLink Blood.
- Chelicerata wikiPageWikiLink Body_plan.
- Chelicerata wikiPageWikiLink Book_lung.
- Chelicerata wikiPageWikiLink Burgess_Shale.
- Chelicerata wikiPageWikiLink Cambodia.
- Chelicerata wikiPageWikiLink Cambrian.
- Chelicerata wikiPageWikiLink Cancer.
- Chelicerata wikiPageWikiLink Carboniferous.
- Chelicerata wikiPageWikiLink Cardiac_arrhythmia.
- Chelicerata wikiPageWikiLink Category:Animal_subphyla.
- Chelicerata wikiPageWikiLink Category:Chelicerates.
- Chelicerata wikiPageWikiLink Category:Extant_Ordovician_first_appearances.
- Chelicerata wikiPageWikiLink Category:Late_Ordovician_first_appearances.
- Chelicerata wikiPageWikiLink Cengage_Learning.
- Chelicerata wikiPageWikiLink Centipede.
- Chelicerata wikiPageWikiLink Central_nervous_system.
- Chelicerata wikiPageWikiLink Cephalothorax.
- Chelicerata wikiPageWikiLink Chasmataspidida.
- Chelicerata wikiPageWikiLink Chela_(organ).
- Chelicerata wikiPageWikiLink Chelicerae.
- Chelicerata wikiPageWikiLink Chitin.
- Chelicerata wikiPageWikiLink Circulatory_system.
- Chelicerata wikiPageWikiLink Cladistics.
- Chelicerata wikiPageWikiLink Cladogram.
- Chelicerata wikiPageWikiLink Class_(biology).
- Chelicerata wikiPageWikiLink Coelom.
- Chelicerata wikiPageWikiLink Convergent_evolution.
- Chelicerata wikiPageWikiLink Courtship.
- Chelicerata wikiPageWikiLink Crustacean.
- Chelicerata wikiPageWikiLink Cuticle.
- Chelicerata wikiPageWikiLink DNA.
- Chelicerata wikiPageWikiLink Dermatitis.
- Chelicerata wikiPageWikiLink Detritivore.
- Chelicerata wikiPageWikiLink Devonian.
- Chelicerata wikiPageWikiLink Diving_bell.
- Chelicerata wikiPageWikiLink Dragonfly.
- Chelicerata wikiPageWikiLink Egg_cell.
- Chelicerata wikiPageWikiLink Embryo.
- Chelicerata wikiPageWikiLink Enzyme.
- Chelicerata wikiPageWikiLink Erectile_dysfunction.
- Chelicerata wikiPageWikiLink Eurypterid.
- Chelicerata wikiPageWikiLink Evolution.
- Chelicerata wikiPageWikiLink Exoskeleton.
- Chelicerata wikiPageWikiLink External_fertilization.
- Chelicerata wikiPageWikiLink Eye.
- Chelicerata wikiPageWikiLink Feces.
- Chelicerata wikiPageWikiLink File:Yellow_mite_(Tydeidae)_Lorryia_formosa_2_edit.jpg.
- Chelicerata wikiPageWikiLink Fossil.
- Chelicerata wikiPageWikiLink Fuxianhuia.
- Chelicerata wikiPageWikiLink Ganglion.
- Chelicerata wikiPageWikiLink Genetic_engineering.
- Chelicerata wikiPageWikiLink Gill.
- Chelicerata wikiPageWikiLink Gnathobase.
- Chelicerata wikiPageWikiLink Herbivore.
- Chelicerata wikiPageWikiLink Hexapoda.
- Chelicerata wikiPageWikiLink Honey_bee.
- Chelicerata wikiPageWikiLink Horseshoe_crab.
- Chelicerata wikiPageWikiLink Indigenous_peoples_of_the_Americas.
- Chelicerata wikiPageWikiLink Insect.
- Chelicerata wikiPageWikiLink Internal_fertilization.
- Chelicerata wikiPageWikiLink Invertebrate.
- Chelicerata wikiPageWikiLink Jellyfish.
- Chelicerata wikiPageWikiLink Jumping_spider.
- Chelicerata wikiPageWikiLink Kodymirus.
- Chelicerata wikiPageWikiLink Lagerstätte.
- Chelicerata wikiPageWikiLink Larva.
- Chelicerata wikiPageWikiLink Limulus_amebocyte_lysate.
- Chelicerata wikiPageWikiLink Liphistiidae.
- Chelicerata wikiPageWikiLink Livestock.
- Chelicerata wikiPageWikiLink Malpighian_tubule_system.
- Chelicerata wikiPageWikiLink Mandibulata.
- Chelicerata wikiPageWikiLink Meningitis.
- Chelicerata wikiPageWikiLink Merostomata.