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Atypoides Riversi
''Atypoides riversi'', known as turret spider, is a species of mygalomorph spider in the family Antrodiaetidae. It is a medium-sized spider native to Northern California Northern California (colloquially known as NorCal) is a geographic and cultural region that generally comprises the northern portion of the U.S. state of California. Spanning the state's northernmost 48 counties, its main population centers incl ... that constructs a burrow with a turret made of soil, vegetation and silk.http://groups.csail.mit.edu/mac/projects/psyche/75/75-157.html This spider's length is long, though females are larger than males. Gallery File:Plugged Atypoides riversi turret.jpg, Plugged turret in northern California File:Atypoides riversi turret, with spiderling turrets (Marshal Hedin).jpg, Turret, with spiderling turrets, northern California. References External links Antrodiaetidae Spiders of the United States Spiders described in 1883 {{Mygalomorphae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mygalomorphae
The Mygalomorphae, or mygalomorphs, are an infraorder of spiders, and comprise one of three major groups of living spiders with over 3000 species, found on all continents except Antarctica. Many members are known as trapdoor spiders due to them forming trapdoors over their burrows. Other prominent groups include Australian funnel web spiders and tarantulas, with the latter accounting for around one third of all mygalomorphs. Description This group of spiders comprises mostly heavy-bodied, stout-legged spiders including tarantulas, Australian funnel-web spiders, mouse spiders, and various families of spiders commonly called trapdoor spiders. Like the "primitive" suborder of spiders Mesothelae, they have two pairs of book lungs, and downward-pointing chelicerae. Because of this, the two groups were once believed to be closely related. Later it was realized that the common ancestors of all spiders had these features (a state known as symplesiomorphy). Following the br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antrodiaetidae
Antrodiaetidae, also known as folding trapdoor spiders or folding-door spiders, is a small spider family related to atypical tarantulas. They are found almost exclusively in the western and midwestern United States, from California to Washington and east to the Appalachian mountains. Exceptions include ''Antrodiaetus roretzi'' and ''Antrodiaetus yesoensis'', which are endemic to Japan and are considered relict species. It is likely that two separate vicariance events led to the evolution of these two species. Genera , the World Spider Catalog accepted the following genera: *''Aliatypus'' Smith, 1908 — United States *''Antrodiaetus'' Ausserer, 1871 — United States, Japan *''Atypoides'' O. Pickard-Cambridge, 1883 — United States *''Hexura'' Simon, 1884 — United States Name The name “folding-door” describes how they open or close the entrance to their burrow; they unfold or fold the door. See also * List of Antrodiaetidae species This page lists all described gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern California
Northern California (colloquially known as NorCal) is a geographic and cultural region that generally comprises the northern portion of the U.S. state of California. Spanning the state's northernmost 48 counties, its main population centers include the San Francisco Bay Area (anchored by the cities of San Jose, San Francisco, and Oakland), the Greater Sacramento area (anchored by the state capital Sacramento), the Redding, California, area south of the Cascade Range, and the Metropolitan Fresno area (anchored by the city of Fresno). Northern California also contains redwood forests, along with most of the Sierra Nevada, including Yosemite Valley and part of Lake Tahoe, Mount Shasta (the second-highest peak in the Cascade Range after Mount Rainier in Washington), and most of the Central Valley, one of the world's most productive agricultural regions. The 48-county definition is not used for the Northern California Megaregion, one of the 11 megaregions of the Unite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiders Of The United States
Spiders (order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every land habitat. , 50,356 spider species in 132 families have been recorded by taxonomists. However, there has been debate among scientists about how families should be classified, with over 20 different classifications proposed since 1900. Anatomically, spiders (as with all arachnids) differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax or prosoma, and the opisthosoma, or abdomen, and joined by a small, cylindrical pedicel, however, as there is currently neither paleontological nor embryological evidence that spiders ever had a separat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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