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Latrodectus geometricus. Latrodectus geometricus, commonly known as the brown widow, [2][3] brown button spider, grey widow, brown black widow, [3] house button spider or geometric button spider, is one of the widow spiders in the genus Latrodectus. As such, it is a 'cousin' to the more infamous Latrodectus mactans (black widow).
Latrodectus is a broadly distributed genus of spiders with several species that are commonly known as the true widows. This group is composed of those often loosely called black widow spiders, brown widow spiders, and similar spiders. [3][4][5][6] However, the diversity of species is much greater. A member of the family Theridiidae, this genus ...
Button spider is a common name used in Southern Africa to refer to local members of the spider genus, Latrodectus, the family Theridiidae. There are both black and brown button spiders in Southern Africa, that are known elsewhere as widow spiders. [1][2][3] Seven Latrodectus species can be found in Southern Africa; six of them are native, one ...
Redback spider. The redback spider (Latrodectus hasselti), also known as the Australian black widow, [2][3][4] is a species of highly venomous spider believed to originate in Australia but now, Southeast Asia and New Zealand, with colonies elsewhere outside Australia. [5] It is a member of the cosmopolitan genus Latrodectus, the widow spiders.
Latrodectus mactans. (Fabricius, 1775) [1] Latrodectus mactans, known as southern black widow or simply black widow, and the shoe-button spider, [citation needed] is a venomous species of spider in the genus Latrodectus. The females are well known for their distinctive black and red coloring and for the fact that they will occasionally eat ...
Although the 'kātĕpo' was reported to the Linnean Society as early as 1855, [2] the spider was formally described as Latrodectus katipo by L. Powell in 1870. [3] Spiders of the genus Latrodectus have a worldwide distribution and include all of the commonly known widow spiders: the North American black widow spider (Latrodectus mactans), the brown widow (Latrodectus geometricus), and the ...
Latrodectism. The southern black widow spider (Latrodectus mactans), a cause of latrodectism. Specialty. Emergency medicine. Latrodectism (/ lætrəˈdɛktɪzəm /) is the illness caused by the bite of Latrodectus spiders (the black widow spider and related species). Pain, muscle rigidity, vomiting, and sweating are the symptoms of latrodectism.
Tardigrades are usually about 0.5 mm (0.020 in) long when fully grown. [ 2 ] They are short and plump, with four pairs of legs, each ending in claws (usually four to eight) or suction disks. [ 2 ][ 15 ] Tardigrades are prevalent in mosses and lichens and feed on plant cells, algae, and small invertebrates.