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Topic: Arthropod


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In the News (Wed 16 Jan 19)

  
  Arthropoda   (Site not responding. Last check: 2007-11-01)
Hox genes and the phylogeny of the arthropods.
The mitochondrial genome of the house centipede Scutigera and the monophyly versus paraphyly of myriapods.
Molecular phylogeny of arthropods and the significance of the Cambrian "explosion" for molecular systematics.
tolweb.org /tree?group=Arthropoda&contgroup=Animals   (1210 words)

  
 Arthropod - Wikipedia, the free encyclopedia
Arthropods are common throughout marine, freshwater, terrestrial, and even aerial environments, as well as including various symbiotic and parasitic forms.
Arthropods are characterised by the possession of a segmented body with appendages on each segment.
Arthropods are thought to have evolved from segmented worms during the Pre-Cambrian era.
en.wikipedia.org /wiki/Arthropod   (1141 words)

  
 Arthropod leg - Wikipedia, the free encyclopedia
The arthropod leg is a form of jointed appendage of arthropods, usually used for walking.
Many of the terms used for arthropod leg segments are of Latin origin, and may be confused with terms for bones: coxa (meaning hip), trochanter (compare greater trochanter and lesser trochanter), femur, tibia, tarsus, ischium, metatarsus, carpus, dactylus (meaning finger), patella.
The claw of a lobster or crab is formed by the articulation of the dactylus against an outgrowth of the propodus.
en.wikipedia.org /wiki/Arthropod_leg   (782 words)

  
 arthropod - Search Results - MSN Encarta   (Site not responding. Last check: 2007-11-01)
Arthropod, animal with a hard, outer skeleton and a jointed body and limbs.
Arthropods make up a phylum of invertebrates that includes insects, such...
Crustacean, common name for any of a group of mainly aquatic arthropod invertebrates, including the crab, lobster, and shrimp.
ca.encarta.msn.com /arthropod.html   (93 words)

  
 Introduction to the Arthropoda
Since many arthropod species remain undocumented or undiscovered, especially in tropical rain forests, the true number of living arthropod species is probably in the tens of millions.
Arthropods range in distribution from the deep sea to mountain peaks, in size from the king crab with its 12-foot armspan to microscopic insects and crustaceans, and in taste from chocolate covered ants to crawfish jambalaya and lobster Newburg.
Arthropods have a stiff cuticle made largely of chitin and proteins, forming an exoskeleton that may or may not be further stiffened with calcium carbonate.
www.ucmp.berkeley.edu /arthropoda/arthropoda.html   (297 words)

  
 The Ultimate Arthropod Dog Breeds Information Guide and Reference
Arthropods (Phylum Arthropoda) are the largest phylum of animals and include the insects, arachnids, crustaceans, and other similar creatures.
Arthropods respire (breathe) through a tracheal system; a potential difficulty considering that the skeletal structure is external and covers nearly all of the body.
At one point it was considered that the different subphyla of arthropods had separate origins from segmented worms, and in particular that the Uniramia were closer to the Onychophora than to other arthropods.
www.dogluvers.com /dog_breeds/Arthropod   (1068 words)

  
 RedOrbit - Science - On Homology of Arthropod Compound Eyes1   (Site not responding. Last check: 2007-11-01)
Arthropod compound eye homology is possible, especially between crustaceans and hexapods, which have very similar eye facets and may be sister taxa.
Whether or not all arthropod compound eyes are homologous depends on whether arthropods are monophyletic and on which of the major groups are sister-taxa (Paulus, 2000).
Regardless of the inclusiveness of a homology statement that depends on arthropod phylogeny, the primary argument for compound eye homology is the morphological similarity of arthropod compound eyes.
www.redorbit.com /news/display?id=50436   (4903 words)

  
 Harris and Jackman: Pecan Arthropod Management
Pecan arthropod management practices today are a legacy inherited from our predecessors stretching back in time more than 4,000 years to "when the Sumerians used sulfur compounds to control insects and mites" (Bottrell 1979).
Arthropod resistance to pesticides in pecan is primarily due to a drastic reduction of genetic diversity of pecan through vegetative propagation that predisposes orchards to increasing problems from pecan scab.
The first case of pesticide resistance in pecan was a pathogen, the causal agent for pecan scab, to Benlate in 1975, followed by an arthropod, hickory scorch mite, resistance to carbamates and organophosphates in 1979.
ipmworld.umn.edu /chapters/harrism.htm   (4938 words)

  
 Arthropod - Search Results - ninemsn Encarta
Arthropod, term for invertebrate animals having an external skeleton and jointed appendages, such as crustaceans, insects, and arachnids (which...
Arachnid, scientific term for the scorpion, spider, harvestman, mite, tick, and certain other arthropod animals.
Crustacean, common name for members of a subphylum of mainly aquatic arthropod animals with jaws and two pairs of antennae, such as the crab,...
au.encarta.msn.com /Arthropod.html   (103 words)

  
 The Shape of Life . Arthropods | PBS
The name Arthropod means "jointed foot." All arthropods have segmented bodies and are covered in a jointed, protective armor called an exoskeleton.
In order to grow, arthropods must periodically molt -- a process that entails shedding their exoskeleton and inflating their body before the new skeleton hardens.
The incredible diversity and success of the arthropods can be attributed to their extraordinarily adaptable body plan.
www.pbs.org /kcet/shapeoflife/animals/arthropods.html   (135 words)

  
 Arthropod
Arthropods are important in medicine for a multitude of reasons.
Two arthropod classes of medical importance are the Arachnida (spiders, scorpions, ticks, and mites) and the Insecta (lice, fleas, bedbugs, flies, bees, and ants).
In general, the diagnosis of arthropod bites and stings is dependent on maintenance of a high index of suspicion and familiarity with the arthropod fauna not only in one's region of practice, but also in the travel regions of one's patients.
www.thedoctorsdoctor.com /diseases/arthropod.htm   (3763 words)

  
 FOREIGN PESTS AND VECTORS OF ARTHROPOD-BORNE DISEASES   (Site not responding. Last check: 2007-11-01)
All of the major groups of pathogenic organisms have representatives that are transmitted by arthropod vectors and cause disease in domestic livestock or poultry.
The most prominent groups of arthropods that transmit etiological agents pathogenic to livestock are those that are blood-feeding (hematophagous) and are biologically involved in transmission cycles.
Examples of arthropod vectors that have been intercepted at ports of entry or that have been detected on premises and subsequently eradicated are numerous and alarming (3,8,11,17).
www.vet.uga.edu /vpp/gray_book/Handheld/fpv.htm   (4726 words)

  
 Arthropod trackways   (Site not responding. Last check: 2007-11-01)
This site is a guide to arthropod trackway material in the fossil record, how trackways are formed, preserved and the main types you are likely to encounter.
Arthropods are the most successful and diverse group of living invertebrates, and are characterised by their hard outer exoskeleton and jointed appendages.
The arthropod's firm exoskeleton provides a rigid base for internal muscle attachment, therefore they are highly mobile and have the potential for fast movement.
palaeo.gly.bris.ac.uk /Palaeofiles/Traces/ichno.html   (216 words)

  
 Welcome to Project ALAS   (Site not responding. Last check: 2007-11-01)
The diversity of organisms such as mammals, birds, and trees is fairly well known, and their distributions and population sizes shape our conservation efforts, but diversity of these large organisms is dwarfed by the arthropods.
Arthropods also form a large pool of untapped natural products (pharmaceuticals, other biochemical products, biological control agents).
Unfortunately, our nearly total ignorance of patterns of arthropod diversity and our lack of inventory products (identification tools, locality data, specimens, databases) greatly limit the inclusion of arthropods in conservation applications and natural products development.
viceroy.eeb.uconn.edu /alas/alas.html   (122 words)

  
 Arthropod Fossils From The Ordovician Period
The arthropods are a thriving group of animals that have existed since at least the Cambrian Period, 543 - 490 million years ago.
During the Camprian Period, the arthropods underwent rapid evolution.
Soft bodied relatives of the arthropods appeared even earlier during the Vendian Period, 650 to 543 million years ago.
members.wri.com /jeffb/Fossils/Arthropoda.shtml   (217 words)

  
 Arthropod Park   (Site not responding. Last check: 2007-11-01)
Many arthropods (for example, butterflies) spend a part of their lives as larvae, during which time their bodily form is rather wormlike.
To see at a glance that they are arthropods, you may have to wait until they grow up; however, if you look closely, you can see that even a caterpillar has little legs.
Arthropods have some other characteristics in common, but not all of them are visible on the outside.
www.sasionline.org /arthzoo/index.htm   (347 words)

  
 Arthropods: joints and outside skeletons
Arthropods include animals such as insects, crustaceans and arachnids.
Arthropods have limbs with joints that allow them to move.
Arthropods at the Orkin Insect Museum, a module for the Smithsonian Institution
www.kidport.com /RefLib/Science/Animals/Arthropods.htm   (108 words)

  
 MSB Arthropod Division - About
Advance the taxonomy of arthropods and their inventory in the state and region.
The Division of Arthropods is located on the second floor in CERIA Building, Room 216 (Building 83).
The Arthropod Division provides assistance for the preparation of specimen labels for people who intend to donate their specimens to the Arthropod Division.
www.msb.unm.edu /arthropods/about.html   (771 words)

  
 ARTHROPODS
Most of these are as vectors of different pathogens and, in other sections of this text, we have dealt with such disease vectors.
There are also a number of arthropods that cause harm due their venom but these are not parasites.
Here, we shall deal with arthropods that are parasitic to and cause disease in man. For example, myiasis (burial of larvae in tissue) is an obligatory step in the life cycle of some flies and incidental for others.
pathmicro.med.sc.edu /parasitology/arthropods.htm   (2045 words)

  
 Worldworx Travel - Health - Insect Arthropod Protection
Although vaccines or chemoprophylactic drugs are available against important vector-borne diseases such as yellow fever and malaria, travelers still should be advised to use repellents and other general protective measures against biting arthropods.
Although many vector-borne infections can be prevented by avoiding rural locations, certain mosquito- and midge-borne arboviral and parasitic infections are transmitted seasonally, and simple changes in itinerary can greatly reduce risk for acquiring them.
Travelers should be advised that exposure to arthropod bites can be minimized by modifying patterns of activity or behavior.
www.worldworx.tv /health/insect-arthropod/index.htm   (1063 words)

  
 Arthropod Endocrinology News Home Page   (Site not responding. Last check: 2007-11-01)
Publication of Arthropod Endocrinology News and maintenance of the Directory of Arthropod Endocrinologists have been discontinued.
Arthropod Endocrinology News (ISSN: 1522-4120 [print edition]), was a monthly publication designed to keep readers abreast of the latest developments in the field of arthropod endocrinology.
In addition to another month's worth of the published literature, this issue features the first installment of the "Arthropod Peptide Hormone and Neuropeptide Database (APHND)," a comprehensive listing of information on the peptide hormones and neuropeptides of arthropods.
www.sciref.org /aen   (206 words)

  
 Spiders, Ticks, Centipedes: Index of Non-Insect Arthropods
This page displays the six Arthropod records currently available within the Entophiles database.
Select one of the thumbnail photographs of spiders and a tailless whip-scorpion below to access the descriptive record for this non-insect arthropod.
They also have two body segments comprised of a cephalothorax and abdomen as apposed to an insects three main body segments of a head, thorax, and abdomen.
www.insects.org /entophiles/arthropoda/index.html   (99 words)

  
 Studies in arthropod morphology and evolution   (Site not responding. Last check: 2007-11-01)
The following pages document recent advances in the understanding of arthropod morphology and evolution stemming from work conducted in the Shultz Lab in the Department of Entomology at the University of Maryland.
The initial focus of this site will be on aspects of the biology of chelicerates (spiders, scorpions and their relatives) and myriapods (centipedes, millipedes and their relatives).
This site will eventually expand to include insects and crustaceans, and over time we will construct a comprehensive virtual treatise on arthropod morphology and evolution.
www.life.umd.edu /entm/shultzlab/vtab   (110 words)

  
 SERAMBO - Southern Appalachian Biological Control Initiative Workshop - Biological Control of Arthropod Pests of the ...
The literature on 94 species of arthropod forest pests was reviewed with the objective of summarizing current knowledge about the role of biological control in the population dynamics of these pests.
This was done for the purpose of identifying which species were the best candidates as future, new or reopened, projects of biological control.
Other species, not reviewed, may be important pests from the perspective of more particular geographic areas or tree species.
www.main.nc.us /SERAMBO/BControl/arthropod.html   (1144 words)

  
 Sexual behaviour Rapid speciation in an arthropod : Nature
Sexual behaviour Rapid speciation in an arthropod : Nature
Here we estimate the rate of speciation in Laupala, a group of forest-dwelling Hawaiian crickets that is characterized primarily through differences in male courtship song
We find that Laupala has the highest rate of speciation so far recorded in arthropods, supporting the idea that divergence in courtship or sexual behaviour drives rapid speciation in animals.
nature.com /nature/journal/v433/n7024/abs/433375a.html;jsessionid=97...   (202 words)

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