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Spider with a bee
Spider with a bee (Pictures of Arachnids)


Arachnids (Arachnida)
Arachnology is the science of arachnids (Arachnida), while Acarology is concerned only with animals with a spider-like appearance. Arachnids belong to the Phylum of Arthropods (Arthropoda) and the Subphylum Chelicerata. Arachnida can be classified as spiders (Araneae), whip spiders (Amblypygi), Solifugae, hooded tickspiders (Ricinulei), harvestmen (Phalangida), mites (Acarina) and ticks (Ixodida). The largest order within the arachnids are the Acarina.
Spider - Arachnid
Spider - Arachnid (Pictures of Arachnids)
Arachnids, in contrast to insects, have 8 instead of 6 legs. Instead of compound eyes arachnids have 8 simple eyes. The head and chest are one unit (prosoma). The prosoma is followed by the abdomen which is not divided and mostly appears in a bigger size. They are a member of the subphylum Chelicerata having the chelicerae Ė the appendages which appear before the mouth - which give the group its name. On the end of the Chelicerata are retractable claws, and in their points are poison glands.
Arachnid
Arachnid (Pictures of Arachnids)
The mouthparts (which also are part of the genitals on the male) are to find on the head too. Attached to the prosoma are 4 (six to seven jointed) leg pairs, which (together with the sensitive hairs) build an important sense organ. On the abdomen of the female spiders (Araneae) the genital openings (epigynes) can be found at the bottom. On the underside of the spiderís abdomen is the anus surrounded by 4 to 8 warts. These warts belong to the spiderís silk-spinning organ (spinneret).
Spider caught in a net
Spider caught in a net (Pictures of Arachnids)
The life span of arachnids, in contrast to that of insects varies widely. Their body growth is greatly limited by a rigid exoskeleton. Arachnids moult, after retreating into hiding and fasting. While most spiders moult hanging down from a thread (thread moulting) to spend the time of moulting on their backs.
Arachnida on cobweb
Arachnida on cobweb (Pictures of Arachnids)
Almost all spiders are land animals. They often remain hidden during the day and are active only at dusk or at night. The water spider is the only spider that lives in water. A number of species hunt on the water.
Arachnid 1 mm long
Arachnid 1 mm long (Pictures of Arachnids)
Birds are the most common spider predators. Amphibians, reptiles, and bats also prey on spiders on occasion. Some spider species (eg Mimetidae) feed exclusively on other spiders. Other natural enemies are: species of wasps, ants, dragonflies, ball flies, nematodes and mites.
Amongst humans, particularly in western industrialized countries, spiders have a bad reputation. This irrational aversion may in some cases lead to mental illness (arachnophobia). Some species of spiders are in fact dangerous to humans, for example, the black widow. In Cambodia, spiders are brutally killed and eaten. However in many Asian cultures, the spider is considered useful because it kills insects. In West Africa, the spider is considered a deity.

Families1.063
Genera15.295
Species143.422
Common namesArachnids
German namesSpinnentiere
Dutch namesSpinachtigen
Danish namesSpindlere
Finnish namesHämähäkkieläimet
Norwegian namesEdderkoppdyr
Swedish namesSpindeldjur
Spanish namesArácnido
French namesArachnides
Portuguese namesAracnídeo
AuthorLamarck, 1801
Distribution
Continents:

Eurasia (Asia, Europe, Russia, Caucasus, Kaukasia)

America (North America, South America, Central America, Caribbean)

Africa (East Africa, Southern Africa, Central Africa, West Africa, North Africa, Cape Verde)

Oceania (Australasia, Polynesia, Melanesia, Micronesia)

Antarctica (Antarctic)


Ecozones:

Palaearctic (West Palaearctic, South Palaearctic, North Palaearctic)

Nearctic, Afrotropical, Neotropical, Oriental, Holarctic


Fossils:

Cenozoic (Paleogene, Neogene, Quaternary)

Paleozoic (Cambrian, Permian, Ordovician, Carboniferous, Silurian, Devonian)

Mesozoic (Cretaceous, Jurassic, Triassic)


World Oceans:

Atlantic Ocean (British overseas territory Atlantic, Mediterranean Sea, South Georgia and the South Sandwich Islands, North Sea)

Pacific Ocean (Pacific Islands, East Pacific, North Pacific, West Pacific, South Pacific)

Indian Ocean (Bay of Bengal, Southeast Indian Ocean)


Countries
Checklists
Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bhutan, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, Brunei, Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Cape Verde, Central African Republic, Chad, Chile, China, Colombia, Comoros, Cook Islands, Costa Rica, Croatia, Cuba, Cyprus, Czech Republic, Democratic Republic of the Congo, Denmark, Djibouti, Dominica, Dominican Republic, East Timor, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Ethiopia, Fiji, Finland, France, Gabon, Gambia, Georgia, Germany, Ghana, Greece, Grenada, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Ivory Coast, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kiribati, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Moldova, Monaco, Mongolia, Montenegro, Morocco, Mozambique, Myanmar, Namibia, Nauru, Nepal, Netherlands, New Zealand, Nicaragua, Niger, Nigeria, Niue, North Korea, Norway, Oman, Pakistan, Palau, Palestine, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Republic of the Congo, Romania, Russia, Rwanda, São Tomé and Príncipe, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, San Marino, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, Somaliland, South Korea, South Sudan, Spain, Sri Lanka, Sudan, Suriname, Swaziland, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Tuvalu, USA, Uganda, Ukraine, United Arab Emirates, United Kingdom, Uruguay, Uzbekistan, Vanuatu, Vatican City, Venezuela, Vietnam, Yemen, Zambia, Zimbabwe
Links and ReferencesArachnida in biolcoll.utu.fi
Arachnida in bug.tamu.edu
Arachnida in wiki.spinnen-forum.de
Arachnida in darwinfoundation.org
Arachnida in faunaeur.org
Arachnida in itis.gov
Arachnida in spiderling.de
Arachnida in wsc.nmbe.ch
Arachnida in dyntaxa.se

Further chapters of "Arachnids"
- Harvestmen
- Spiders
  - Zygielle x-notata
  - European Garden Spider
  - Tetragnatha montana
  - Walnut Orb-Weaver Spider
  - Autumn spider
  - Money spiders
    - Platform hammock-spider
  - Sac spiders
    - Clubiona diversa
- Jumping Spiders
  - zebra spider
  - Euophrys frontalis
  - Heliophanus flavipes
  - Salticus cingulatus
  - Marpissa muscosa
- Mites and Ticks
  - Trombidium holosericeum
  - European whirligig mite
- Crab Spiders
  - Heather Spider
  - Synema globosum
- Running Crab Spiders
  - Philodromus dispar
  - Philodromus aureolus
  - Philodromus rufus
- Cobweb spiders
  - Rabbit Hutch Spider
  - Enoplognatha ovata
  - Steatoda castanea
- Meshweb Weavers
  - Nigma walckenaeri
- Orb-weaver spider
  - Wasp spider
  - Lobed argiope
  - Oak spider
  - Long-jawed orb weavers
    - Pachygnatha listeri
    - Tetragnatha
      - Tetragnatha pinicola
      - Tetragnatha extensa
  - Cucumber green spider
- Ticks
  - Castor bean tick
- Nursery web spiders
  - Pisaura mirabilis
- Wolf spiders
  - Pardosa amentata
  - Alopecosa cuneata
  - Alopecosa
  - Field wolf-spider
Description of images / photos
Photography with Cameras
Nikon D3x, Nikon D300, Canon 50D
Image editing with Photoshop
1. Spider with a bee
2. Spider - Arachnid
3. Arachnid
4. Spider caught in a net
5. Arachnida on cobweb
6. Arachnid 1 mm long
Quick search: Arachnids - Arachnida - Arachnid - Eyes - Insects - Insect
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Taxonomy
ClassArachnida
Arachnids
AuthorLamarck, 1801
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