Abstract:redescription and distribution of Latrodectus geometricus in Uruguay (Araneae: Theridiidae). Biota Neotrop. 13(1): http:// www.biotaneotropica.org.br/v13n1/en/abstract?short-communication+bn02813012013Abstract: This study provides the first accurate records of Latrodectus geometricus C. L. Koch, 1841 for Uruguay and extends the known distribution of this species to the Southeastern region of South America. Data and figures of the genitalic morphology for the recognition of the species and natural history in th… Show more
“… Figure 1 Distribution of reported sightings of Latrodectus geometricus. (a) Map showing the global distribution of Latrodectus geometricus [ 1 , 2 , 7 , 11 , 12 , 19 , 21 - 24 , 27 - 127 ]. (b) Locations in the northwest, central and south of Peninsular Malaysia with new records of the brown widow spider.…”
BackgroundThe brown widow spider (Latrodectus geometricus Koch, 1841) has colonised many parts of the world from its continent of origin, Africa. By at least 1841, the species had successfully established populations in South America and has more recently expanded its range to the southern states of North America. This highly adaptable spider has been far more successful in finding its niche around the world than its famous cousins, the black widow, Latrodectus mactans, found in the south-eastern states of North America, and the red-back, Latrodectus hasselti, found mostly in Australia, New Zealand and Japan.MethodsWe performed an extensive web search of brown widow sightings and mapped the location of each sighting using ArcGIS. Specimens reputedly of the species L. geometricus were collected at three localities in Peninsular Malaysia. The spiders were identified and documented based on an examination of morphological characteristics and DNA barcoding.ResultsThe spiders found in Peninsular Malaysia were confirmed to be Latrodectus geometricus based on their morphological characteristics and DNA barcodes. We recorded 354 sightings of the brown widow in 58 countries, including Peninsular Malaysia.ConclusionReports from the Americas and the Far East suggest a global-wide invasion of the brown widow spider. Herein we report the arrival of the brown widow spider in Peninsular Malaysia and provide notes on the identification of the species and its recently expanded range.
“… Figure 1 Distribution of reported sightings of Latrodectus geometricus. (a) Map showing the global distribution of Latrodectus geometricus [ 1 , 2 , 7 , 11 , 12 , 19 , 21 - 24 , 27 - 127 ]. (b) Locations in the northwest, central and south of Peninsular Malaysia with new records of the brown widow spider.…”
BackgroundThe brown widow spider (Latrodectus geometricus Koch, 1841) has colonised many parts of the world from its continent of origin, Africa. By at least 1841, the species had successfully established populations in South America and has more recently expanded its range to the southern states of North America. This highly adaptable spider has been far more successful in finding its niche around the world than its famous cousins, the black widow, Latrodectus mactans, found in the south-eastern states of North America, and the red-back, Latrodectus hasselti, found mostly in Australia, New Zealand and Japan.MethodsWe performed an extensive web search of brown widow sightings and mapped the location of each sighting using ArcGIS. Specimens reputedly of the species L. geometricus were collected at three localities in Peninsular Malaysia. The spiders were identified and documented based on an examination of morphological characteristics and DNA barcoding.ResultsThe spiders found in Peninsular Malaysia were confirmed to be Latrodectus geometricus based on their morphological characteristics and DNA barcodes. We recorded 354 sightings of the brown widow in 58 countries, including Peninsular Malaysia.ConclusionReports from the Americas and the Far East suggest a global-wide invasion of the brown widow spider. Herein we report the arrival of the brown widow spider in Peninsular Malaysia and provide notes on the identification of the species and its recently expanded range.
“…A nivel mundial el género cuenta con más de 30 especies reconocidas, agrupadas en dos clados filogenéticos claramente diferenciados, uno compuesto por L. geometricus y L. rhodesiensis, y el otro compuesto del resto de las especies (Garb et al 2004). Varias de estas especies han sido reportadas en Argentina, Brasil, Chile, Colombia, Perú, Paraguay, Uruguay y Venezuela (Levi 1959, Abalos 1962, McCrone & Levi 1966, Cortes &Vasconcellos-Neto 1993, Aguilera et al 2009, Simó et al 2013, y algunas especies como Latrodectus geometricus son de distribución cosmopolita (Levi 1967). Por consiguiente no es de extrañarse que el género se encuentre presente en el país, tal como fue demostrado por el presente estudio donde se confirma la presencia del género Latrodectus en seis departamentos del país; además se evidenció que este género se halla presente en cuatro ecorregiones del país: Yungas, Gran Chaco, Bosque Tucumano Boliviano y Valles secos interandinos, lugares cálidos con una temperatura media que oscila alrededor de los 24 °C, todos estos lugares a excepción de los Yungas presentan bajos niveles de precipitación anual (Ibisch et al 2003).…”
A través del examen de ejemplares capturados en 12 localidades se confirma la presencia del género Latrodectus, distinguiéndose 6 morfotipos en seis departamentos y cuatro ecorregiones. Los resultados implican que existe riesgo de accidentes producidos por la mordedura de este tipo de araña.
“…All specimens and egg sacs are stored in 70% ethanol in collection of R. Rozwałka (Lublin). The main literature used for identification was Levi (1980), Levy (1998), Paquin et al (2008), Le Peru (2011), Simó et al (2013), Bodkhe et al (2015), and Nentwig et al (2017. Drawings were made by R. Rozwałka.…”
Global warming and intensive transport favor the spreading of species. In 2015, three theridiid spider species were found in Poland for the first time: Kochiura aulica, Latrodectus geometricus and Theridion melanostictum. Kochiura auilica was transported in pomegranates from Turkey and T. melanostictum in pomegranates from Chile. One female of Latrodectus geometricus hung, with three egg sacs, on a web in a car imported from the USA (2015), and also in grapes imported from Chile, Morocco and RPA (2017). Effect of non-native spider species in Poland is discussed.
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