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Seothyra
''Seothyra'', commonly known as the buckspoor spiders, buck spoor spiders or just spoor spiders, belong to a sand-dwelling, burrowing genus of Araneomorphae, araneomorph spiders in the family Eresidae. The 13 species are endemic to the arid, sandy flats and semistabilized red dunes of southern Africa. They are sexually dimorphic. The tiny males, which are seldom seen, imitate Camponotus, sugar ants or velvet ants in their appearance and habits, while the females hide in and hunt from their characteristic burrows. They are thermophilous, with males as well as females being most active on hot days. Range and density They occur in Namibia, Botswana and South Africa. In South Africa they are present in northern Limpopo, and the Northern Cape as far south as the Tankwa Karoo. Their distribution is patchy, but when forming conspecific aggregations, their webs may even touch one another. Such clusters may contain thousands of females, with a density of 50 m−2, or locally, 100 to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seothyra Schreineri
''Seothyra'', commonly known as the buckspoor spiders, buck spoor spiders or just spoor spiders, belong to a sand-dwelling, burrowing genus of araneomorph spiders in the family Eresidae. The 13 species are endemic to the arid, sandy flats and semistabilized red dunes of southern Africa. They are sexually dimorphic. The tiny males, which are seldom seen, imitate sugar ants or velvet ants in their appearance and habits, while the females hide in and hunt from their characteristic burrows. They are thermophilous, with males as well as females being most active on hot days. Range and density They occur in Namibia, Botswana and South Africa. In South Africa they are present in northern Limpopo, and the Northern Cape as far south as the Tankwa Karoo. Their distribution is patchy, but when forming conspecific aggregations, their webs may even touch one another. Such clusters may contain thousands of females, with a density of 50 m−2, or locally, 100 to 200 m−2. Fossili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seothyra Sp, Vel Onder Sydakkie, Steenbokpan
''Seothyra'', commonly known as the buckspoor spiders, buck spoor spiders or just spoor spiders, belong to a sand-dwelling, burrowing genus of araneomorph spiders in the family Eresidae. The 13 species are endemic to the arid, sandy flats and semistabilized red dunes of southern Africa. They are sexually dimorphic. The tiny males, which are seldom seen, imitate sugar ants or velvet ants in their appearance and habits, while the females hide in and hunt from their characteristic burrows. They are thermophilous, with males as well as females being most active on hot days. Range and density They occur in Namibia, Botswana and South Africa. In South Africa they are present in northern Limpopo, and the Northern Cape as far south as the Tankwa Karoo. Their distribution is patchy, but when forming conspecific aggregations, their webs may even touch one another. Such clusters may contain thousands of females, with a density of 50 m−2, or locally, 100 to 200 m−2. Fossiliz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seothyra Fasciata
''Seothyra fasciata'', one of the buck spoor spiders, is a sand-dwelling species of Eresidae. It is native to southern Africa. Range It is native to sandy regions of southern Namibia (Kalahari to Naukluft The Naukluft Mountains (Afrikaans and German: ''Naukluftberge'') are a mountain range in central Namibia. The southern part of the mountain range forms the easternmost part of the Namib-Naukluft National Park. The northern mountains are occupied ...), Botswana and northern South Africa. References * Dippenaar-Schoeman A. S. Foord S. and Haddad C. 2013. Spiders of the Savanna Biome. University of Venda & Agricultural Research Council. * Dippenaar-Schoeman, A. S. (1991). A revision of the African spider genus Seothyra Purcell (Araneae: Eresidae). Cimbebasia 12: 135-160. * Dippenaar-Schoeman A. S. 2014. Field Guide of the Spiders of South Africa. Lapa Publisher 424 pp. * Dippenaar-Schoeman A. S., Haddad C. R., Foord S. H., Lyle R., Lotz L. N., Helberg L., Mathebula S., Van De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eresidae
Velvet spiders (family Eresidae) are a small group (about 130 species in 9 genera) of spiders almost entirely limited to the Old World, with exception of a few species known from Brazil. In Europe some are commonly called the ladybird spiders Description This family can sometimes be confused with the jumping spiders, or those in the Palpimanidae family. These spiders are usually black or brown in color, thought they can also have brighter colors as pictured. As their common name implies they can look quite smooth and velvety. They usually live in silken tubes under objects, or underground, but the genus ''Stegodyphus,'' builds silken nests. Identification They can be distinguished from most species except the Penestomidae by their semi rectangular carapace and clypeal hood. Thought the can be distinguished from Penestomidae by the eye arrangement, straight anterior eye row and strongly recurved posterior eye row, with the median eyes close together. Social Behavior ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matriphagy
Matriphagy is the consumption of the mother by her offspring. The behavior generally takes place within the first few weeks of life and has been documented in some species of insects, nematode worms, pseudoscorpions, and other arachnids as well as in caecilian amphibians. The specifics of how matriphagy occurs varies among different species, but the process is best described in the Desert spider, '' Stegodyphus lineatus'', where the mother harbors nutritional resources for her young through food consumption. The mother is able to regurgitate small portions of food for her growing offspring, but between 1–2 weeks after hatching the progeny capitalize on this food source by eating her alive. Typically, offspring only feed on their biological mother as opposed to other females in the population. In other arachnid species, matriphagy occurs after the ingestion of nutritional eggs known as trophic eggs (e.g. Black lace-weaver ''Amaurobius ferox'', Crab spider ''Australomisidia ergandr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asemesthes
''Asemesthes'' is a genus of African ground spiders that was first described by Eugène Simon in 1887. Species it contains twenty-six species, all from South Africa, Namibia, Ethiopia, or Angola: *''Asemesthes affinis'' Lessert, 1933 – Angola *'' Asemesthes albovittatus'' Purcell, 1908 – Namibia, South Africa *''Asemesthes ales'' Tucker, 1923 – South Africa *''Asemesthes alternatus'' Lawrence, 1928 – Namibia *''Asemesthes ceresicola'' Tucker, 1923 – South Africa *''Asemesthes decoratus'' Purcell, 1908 – Namibia, South Africa *'' Asemesthes flavipes'' Purcell, 1908 – Namibia *'' Asemesthes fodina'' Tucker, 1923 – South Africa *'' Asemesthes hertigi'' Lessert, 1933 – Angola *'' Asemesthes kunenensis'' Lawrence, 1927 – Namibia *''Asemesthes lamberti'' Tucker, 1923 – South Africa *'' Asemesthes lineatus'' Purcell, 1908 – Namibia, South Africa *'' Asemesthes modestus'' Dalmas, 1921 – South Africa *'' Asemesthes montanus'' Tucker, 1923 – South Africa *''Ase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorceus
''Dorceus'' is a genus of velvet spiders that was first described by C. L. Koch in 1846. Species it contains five species: *'' Dorceus albolunulatus'' (Simon Simon may refer to: People * Simon (given name), including a list of people and fictional characters with the given name Simon * Simon (surname), including a list of people with the surname Simon * Eugène Simon, French naturalist and the genus ..., 1876) – Algeria *'' Dorceus fastuosus'' C. L. Koch, 1846 ( type) – Tunisia, Senegal, Israel *'' Dorceus latifrons'' Simon, 1873 – Algeria, Tunisia *'' Dorceus quadrispilotus'' Simon, 1908 – Egypt *'' Dorceus trianguliceps'' Simon, 1911 – Tunisia References External links * Araneomorphae genera Eresidae {{Araneomorphae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinneret (spider)
A spinneret is a silk-spinning organ of a spider or the larva of an insect. Some adult insects also have spinnerets, such as those borne on the forelegs of Embioptera. Spinnerets are usually on the underside of a spider's opisthosoma, and are typically segmented. While most spiders have six spinnerets, some have two, four, or eight. They can move both independently and in concert. Most spinnerets are not simple structures with a single orifice producing a single thread, but complex structures of many microscopic spigots, each producing one filament. This produces the necessary orientation of the protein molecules, without which the silk would be weak and useless. Spigots can be singular or found in groups, which also permits spiders to combine multiple filaments in different ways to produce many kinds of silk for various purposes. Spinneret morphology can help arachnologists identify the taxon of a specimen and the specific morphology of a spigot can determine its use as well ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leucorchestris
''Leucorchestris'' is a genus of African huntsman spiders that was first described in 1962 by R. F. Lawrence, who described all of the species in the genus between 1962 and 1966. ''Leucorchestris'' species, also known as a "dancing white lady spiders", are white, wandering spiders that are strictly nocturnal and live in burrows that have been dug into the desert sand. They spend their days burrowed in the sand and only come out to the surface at night. When it is time to come out, ''Leucorchestris'' only come out for hunting, mating, and chasing other male spiders. Males are known well for the long distances that they travel when searching for females to mate with. When the male spiders leave their burrows to go out and search for female spiders for mating, their trips usually go as far out as 40-60 m away from their burrows and they are still able to find their way back to them without retracing the path that they took when leaving. ''Leucorchestris'' species communicate thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rayleigh Wave
Rayleigh waves are a type of surface acoustic wave that travel along the surface of solids. They can be produced in materials in many ways, such as by a localized impact or by piezo-electric transduction, and are frequently used in non-destructive testing for detecting defects. Rayleigh waves are part of the seismic waves that are produced on the Earth by earthquakes. When guided in layers they are referred to as Lamb waves, Rayleigh–Lamb waves, or generalized Rayleigh waves. Characteristics Rayleigh waves are a type of surface wave that travel near the surface of solids. Rayleigh waves include both longitudinal and transverse motions that decrease exponentially in amplitude as distance from the surface increases. There is a phase difference between these component motions. The existence of Rayleigh waves was predicted in 1885 by Lord Rayleigh, after whom they were named. In isotropic solids these waves cause the surface particles to move in ellipses in planes normal t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palpimanus
''Palpimanus'' is a genus of palp-footed spiders that was first described by L. Dufour in 1820. Species it contains thirty-six species, found in Africa, Asia, Europe, and Argentina: *'' Palpimanus aegyptiacus'' Kulczyński, 1909 – Egypt, Chad, Tunisia, Algeria *'' Palpimanus argentinus'' Mello-Leitão, 1927 – Argentina *'' Palpimanus armatus'' Pocock, 1898 – South Africa *'' Palpimanus aureus'' Lawrence, 1927 – Namibia *'' Palpimanus canariensis'' Kulczyński, 1909 – Canary Is. *'' Palpimanus capensis'' Simon, 1893 – South Africa *'' Palpimanus crudeni'' Lessert, 1936 – Mozambique *'' Palpimanus cyprius'' Kulczyński, 1909 – Cyprus, Syria, Israel *'' Palpimanus denticulatus'' Hernández-Corral & Ferrández, 2017 – Morocco *'' Palpimanus gibbulus'' Dufour, 1820 ( type) – Mediterranean, Central Asia *'' Palpimanus giltayi'' Lessert, 1936 – Mozambique *'' Palpimanus globulifer'' Simon, 1893 – South Africa *'' Palpimanus hesperius'' Simon, 1907 – São Tom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetramorium
''Tetramorium'' is a genus of ants in the subfamily Myrmicinae that includes more than 520 species. These ants are also known as pavement ants. Taxonomy and phylogeny ''Tetramorium'' was first described by Gustav Mayr in 1855 in the same publication as ''Monomorium''. Revision within the genus by Wagner et al. in 2017 recognized a complex of 10 cryptic species, 3 of which were raised from subspecies classifications and 2 of which were newly described. This revision also elevated the pavement ant introduced to North America as the species ''T. immigrans'' rather than the previous designation as a subspecies of ''T. caespitum''. These 10 species within in the ''T. caespitum'' complex are as follows: * ''Tetramorium alpestre'' Steiner, Schlick-Steiner & Seifert, 2010 * ''Tetramorium breviscapus'' Wagner et al., 2017 * ''Tetramorium caespitum'' (Linnaeus, 1758) * ''Tetramorium caucasicum'' Wagner et al., 2017 * ''Tetramorium fusciclava'' Consani & Zangheri, 1952 * ''Tetramorium hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
