Portal:Arthropods

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Arthropods make up the largest phylum of animals (Phylum Arthropoda) and include the insects, arachnids, crustaceans and others. More than 80% of described living animal species are arthropods, with over a million modern species described and a fossil record reaching back to the late Proterozoic era. Arthropods are common throughout marine, freshwater, terrestrial, and even aerial environments, and includes various symbiotic and parasitic forms. They range in size from microscopic plankton (~¼ mm) up to forms several metres across. Arthropods are characterised by the possession of a segmented body with appendages on each segment. They have a dorsal heart and a ventral nervous system. All arthropods are covered by a hard exoskeleton made of chitin, a polysaccharide which protects against trauma and desiccation. They shed this covering periodically when moulting.

Examples of the five arthropod subphyla
Two fossilised trilobites in a limestone slab.
Trilobitomorpha:
Kainops invius
133px
Chelicerata:
Eriophora transmarina
A brown centipede with yellow legs and red antennae faces the viewer.
Myriapoda:
Scolopendra cingulata
A small fly with red eyes.
Hexapoda:
Drosophila melanogaster
A stocky crab with large claws.
Crustacea:
Cancer pagurus
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The Lulworth Skipper, Thymelicus acteon, is a butterfly of the Hesperiidae family. Its name is derived from Lulworth Cove in the county of Dorset, where the first specimens in Great Britain were collected in 1832 by English naturalist James Charles Dale.

The species occurs locally across Central Europe, Asia Minor and North Africa, where its population is considered stable. Its numbers have declined in Northern Europe, leading to its European status of 'vulnerable'. Its range in Britain is restricted to the south coast of Dorset, however it is locally abundant and its numbers currently are perhaps at their greatest since its discovery there.

With a wingspan of 24–28 millimetres (0.9–1.1 in), females being larger than males, the Lulworth Skipper is a small butterfly, the smallest member of the Thymelicus genus in Europe and among the smallest butterflies in Britain. Aside from the size difference, the sexes are distinguished by females having a distinct circle of golden marks on each forewing. Due to their likeness to the rays around the eye of a peacock's feather, these are often known as 'sun-ray' markings, and they can faintly appear on males.

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Oeneis nevadensis (Insecta: Lepidoptera: Nymphalidae)
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A beetle with a pronounced snout and black stripes on its orange elytra stands on the edge of a leaf.
Cscr-featured.svg Credit: Keith Weller, ARS

Diaprepes abbreviatus is a member of the Curculionidae – the family of the "true weevils". With over 60,000 species described worldwide, it is the largest beetle family. Weevils are almost entirely plant feeders, and most species are associated with a narrow range of hosts, in many cases only living on a single species.

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† indicates an extinct taxon.

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Template:/box-header Here are some tasks you can do:

  • Start a new article. Arthropods cover an huge range of taxa and other topics, so there will always be plenty of missing articles. Some which have been explicitly requested are listed here.
  • Clean up existing articles. Lists of articles needing cleanup are available either grouped by the work needed or ungrouped.
  • Expand an existing article. Existing articles are often incomplete and missing information on key aspects of the topic. It is particularly important that the most widely read articles be broad in their scope. Wikipedia:WikiProject Arthropods/Popular pages (updated monthly) shows the number of views each article gets, along with assessments of its quality and importance. Articles with higher importance ratings and greater numbers of views are the priority for article improvements, but almost all our articles would benefit from expansion. Stubs can be found in Category:Arthropod stubs and its subcategories.

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Arthropods
► Arthropod anatomy
► Arthropod morphology
Arthropod stubs

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