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Amaurobius Fenestralis
''Amaurobius fenestralis'' is a species of spider in the family Amaurobiidae ''Amaurobiidae'' is a family of three-clawed cribellate or ecribellate spiders found in crevices and hollows or under stones where they build retreats, and are often collected in pitfall traps. Unlidded burrows are sometimes quite obvious in crust .... It is one of at least two common spiders found in houses known as lace-webbed spider, the other being '' Amaurobius similis''. The specific name ''similis'' is based on its similarity to ''A. fenestralis''. Both are often found near windows, hence the specific name of ''A. fenestralis''. The two species are difficult to distinguish: ''A. fenestralis'' tends to be smaller and lighter in colouration when an adult. Both species have V-shaped markings on their abdomens, with ''A. fenestralis'' usually having two or three, and ''A. similis'' four. Examination of the genitalia may be needed for precise identification. This spider has b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spider
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amaurobiidae
''Amaurobiidae'' is a family of three-clawed cribellate or ecribellate spiders found in crevices and hollows or under stones where they build retreats, and are often collected in pitfall traps. Unlidded burrows are sometimes quite obvious in crusty, loamy soil. They are difficult to distinguish from related spiders in other families, especially Agelenidae, Desidae and Amphinectidae. Their intra- and interfamilial relationships are contentious. According to the World Spider Catalog, 2019, the family Amaurobiidae includes about 275 species in 49 genera. In Australia, they are small to medium-sized entelegyne spiders with minimal sheet webs. They are fairly common in Tasmania and nearby mainland Australia in cooler rainforest, some in caves. They are widespread but uncommon along the eastern coastline. They generally have eight similar eyes in two conservatively curved rows. They often have a calamistrum on metatarsus IV associated with a cribellum. Australian amaurobiids may be dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amaurobius Similis
''Amaurobius similis'' is a species of spider in the family Amaurobiidae. It is one of at least two common spiders found in houses known as lace-webbed spiders. The specific name ''similis'' is based on its similarity to the species ''Amaurobius fenestralis''. Both are often found near windows, hence the specific name of ''A. fenestralis''. Description Mature males have a body length of 6–8 mm, females 9–12 mm. The carapace is dark reddish-brown in colour, with a darker head area. The top of the abdomen has a dark wedge shaped marking, edged with yellow towards the anterior. The legs are coloured as the carapace, and bear darker annulations. The species is very visually similar to ''A. fenestralis'' and, while ''A. similis'' tends to be larger and darker in colouration when mature, microscopic examination of the genitalia is necessary for reliable identification of the two species. Distribution and habitat ''Amaurobius similis'' has a Holarctic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steatoda Nobilis
''Steatoda nobilis'' is a spider in the genus '' Steatoda'', known in the United Kingdom as the noble false widow, as it superficially resembles and is frequently mistaken for the black widow and other spiders in the genus ''Latrodectus''. It is often referred to as ''the'' false widow, although "false widow" is a more general term applied to a wider group of species with this resemblance. It is a moderately medically significant spider, with most bites resulting in symptoms similar to a bee or wasp sting. Some bites may cause more significant harm, partly due to pathogenic bacteria from the spiders. ''S. nobilis'' is spotted all year round, both indoors and outdoors in a variety of habitats including cacti, roadside cuttings, and demolished buildings. The spiders prey on both invertebrates and small vertebrates using an "attack wrap" strategy where silk is wrapped around the victim. ''Steatoda nobilis'' is native to Madeira and the Canary Islands from where it is thought to have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiders Described In 1768
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
