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The appendages of arthropods may be either biramous or uniramous. A uniramous limb comprises a single series of segments attached end-to-end. A biramous limb, however, branches into two, and each branch consists of a series of segments attached end-to-end.

Arachnid legs differ from those of insects by the addition of two segments on either side of the tibia, the patella between the femur and the tibia, and the metatarsus between the tibia and the tarsus, making a total of seven segments.

The legs of crustaceans are divided primitively into seven segments, which do not follow the naming system used in the other groups. They are: coxa, basis, ischium, merus, carpus, propodus, and dactylus. In some groups, some of the limb segments may be fused together. The claw of a lobster or crab is formed by the articulation of the dactylus against an outgrowth of the propodus. Crustacean limbs also differ in being biramous, whereas all other extant arthropods have uniramous limbs.

Myriapods have seven-segmented walking legs, comprising coxa, trochanter, prefemur, femur, tibia, tarsus, and a tarsal claw. Myriapod legs show a variety of modifications in different groups. In all centipedes, the first pair of legs is modified into a pair of venomous fangs called forcipules. In most millipedes, one or two pairs of walking legs in adult males are modified into sperm-transferring structures called gonopods. In some millipedes, the first leg pair in males may be reduced to tiny h

Insects and their relatives are hexapods, having six legs, connected to the thorax, each with five components. In order from the body they are the coxa, trochanter, femur, tibia, and tarsus. Each is a single segment, except the tarsus which can be from three to seven segments, each referred to as a tarsomere.

Arthropod articles can be on any level that makes sense in context. Most will be about particular taxa. For example: 1. Regnum: Animalia 2. Phylum: Arthropoda 3. Subphylum: (if applicable) Crustacea 4. Class: Insecta, Arachnida, Malacostraca 5. Order: Lepidoptera, Araneae, Euphausiacea 6. Family: Papilionidae, Liphistiidae, Euphausiidae 7. Genus: Iphiclides, Heptathela, Euphausia 8. Species: Iphiclides podalirius, Kimura spider (Heptathela kimurai), Euphausia superba Other levels of taxonomy may be added if necessary : subclass, infraclass, suborder, infraorder, superfamily, subfamily, etc. In many cases, it makes sense to combine several taxonomic levels in a single article. For example, the genus Limulus contains only one species, Limulus polyphemus, so the one article covers both levels. Conversely, sometimes it is better to cover only a part of a taxon: mite deals with four different (but related) families and ignores the other families in the order Acari. Some large families, s...

Note: the table below only shows articles tagged with the {{WikiProject Arthropods}} template, so excludes those tagged as belonging to descendant wikiprojects.

Featured lists

1. List of ant subfamilies 2. List of Odonata species of Great Britain

Featured images

1. Featured image set: butterfly wing magnifications

Arthropods requested articles now have their own page: Wikipedia:WikiProject Arthropods/Article requests. Please put them there. Photo requests can be made by adding |needs-photo=yes in the assessment templateor using {{reqphoto|arthropods}}.

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Stub templates

Remember to mark up stubs with the appropriate template. Where specific templates do not exist (e.g. Merostomata, Pycnogonida, etc.), use {{arthropod-stub}}. Otherwise, see below.

Talk pages and grading scheme

Please place {{WikiProject Arthropods}} at the top of an article's talk page so articles can be assessed.What this template does: 1. It will help to lead new editors to this project. 2. If complete with quality and importance grading (see Article Classification and grading scheme), it helps us to stay on top of the huge number of arthropod-related articles.

Categories

Please make sure to add articles to the appropriate categories among the ones listed at Category:Arthropods. If there are any categories that you think should be created, please request them here or on the talk page. In some cases, there might be more appropriate ways to group articles than categories, such as lists or article series boxes. For more information, see Wikipedia:Categories, lists, and series boxes.

Images

To find suitable images for articles, the first place to start is Category:Arthropodaon WikiCommons, where you can search or browse by category.

CC licensed publications

Note:"Open Access" does not always mean "free to use". Media licensed "CC-BY" can be used without restriction, while "CC-BY-NC" or -ND (non-commerical or non-derivative) cannot be used on Wikipedia. (See Commons Licensingfor more details) All images and text published in these journals are free to use on Wikipedia when authors are attributed, unless otherwise noted. 1. BMC Evolutionary Biology 2. European Journal of Taxonomy 3. Pensoft Publishers 3.1. ZooKeys 3.2. International Journal of Myr...

Taxonomy

The pages below provide fairly up-do date information on species names and classification, but it's a good idea to verify when the data was last updated and verified. 1. Catalogue of Life 2. World Register of Marine Species Cladograms can be requested for creation here.

Arachnida – Branchiopoda –Cephalocarida –Chilopoda –Diplopoda –Entognatha –Insecta –Malacostraca –Maxillopoda –Merostomata –Ostracoda –Pauropoda –Pycnogonida –Remipedia –Symphyla [Source: Catalogue of Life: 2014 Annual Checklist]