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PDF | On Jan 1, , V. Huhta and others published Loxosceles laeta (Nicolet) ( Araneae, Loxoscelinae), a venomous spider established in a. PDF | A new species of Loxosceles, L. puortoi, is described from Palmas, State of Tocantins, Brazil. This is the first native species of the laeta group known for. Chilean Recluse, Loxosceles laeta (Nicolet) (Araneae: Sicariidae) in Florida Loxosceles reclusa Gertsch and Mulaik, is known from a few scattered localities.

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Loxosceles Laeta Pdf

Abstract Loxosceles laeta spiders were captured in the West zone of São Paulo City, this being the first record of the specie in this area. Since loxoscelism is an. The “violin” spider, Loxosceles sp is implicated in causing necrotic skin lesions, secondary . causing loxoscelism to L. laeta, L. spadicea, L. .. (Parte I).pdf. 2. Loxosceles laeta (Nicolet, ) Loxosceles laeta Simon, c: (Dm). Boletin Chileno de Parasitologia download pdf.

Like most recluses, it is brown and usually has markings on the dorsal side of its thorax , with a black line coming from it that looks like a violin with the neck of the violin pointing to the rear of the spider resulting in the nickname "fiddleback spider" or "violin spider" in English -speaking areas. Coloring varies from light tan to brown and the violin marking may not be visible. Since the "violin pattern" is not diagnostic, it is far more important, for purposes of identification, to examine the eyes. Most spiders have eight eyes, but recluse spiders have six eyes arranged in pairs dyads with one median pair and two lateral pairs. Like other recluse spiders, the Chilean recluse builds irregular webs that frequently include a shelter consisting of disorderly threads. Unlike most web weavers, they leave these webs at night to hunt. People get bitten when they unintentionally squeeze them in clothing and bedding. These spiders frequently build their webs in woodpiles and sheds, closets, garages, and other places that are dry and generally undisturbed. The spider is frequently found in human dwellings. The spiders can last a long time without food or water, [2] a fact that encourages their worldwide spread. The Chilean recluse spider is native to South America. One colony of the spider is living in the Natural History Museum of Helsinki where it was probably introduced through fruit shipments in the s and s. Medical significance[ edit ] Eyes and fangs of a Chilean recluse As indicated by its name, this spider is not aggressive and usually bites only when pressed against human skin, such as when putting on an article of clothing. Like all sicariid spiders, the venom of the Chilean recluse contains the dermonecrotic agent Sphingomyelinase D , which is otherwise found only in a few pathogenic bacteria. According to one study, the venom of the Chilean recluse along with the six-eyed sand spider Hexophthalma hahni , contains an order of magnitude more of this substance than that of other sicariid spiders such as the brown recluse.

In order to examine the transcripts expressed in venom gland of Loxosceles laeta spider and to unveil the potential of its products on cellular structure and functional aspects, we generated 3, expressed sequence tags ESTs from a cDNA library. Results All ESTs were clustered into 1, clusters, of which Thirty three percent of the ESTs are similar to cellular transcripts, being the major part represented by molecules involved in gene and protein expression, reflecting the specialization of this tissue for protein synthesis.

Conclusion This study provides a first global view of the gene expression scenario of the venom gland of L.

Background Envenomation by spiders of the Loxosceles species brown spiders can produce severe clinical symptoms, including dermonecrosis, thrombosis, vascular leakage, hemolysis and persistent inflammation [ 1 ].

Loxosceles is the most poisonous spider in Brazil and children, who develop the most severe systemic effects after envenomation, nearly always die. At least three different Loxosceles species of medical importance are known in Brazil — L. In North America, several Loxosceles species, including L.

In South Africa, L. In the site of the envenomation, there is initially only a minor discomfort. Google Scholar Horen, W. Tomo cincuentenario 2 , Google Scholar Izu, W. Thesis Bach. Lima, Google Scholar Jaeger, H.

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A survey of the current problem. Google Scholar Levi, H. California Med. Google Scholar Macchiavello, A. Puerto Rico J. Health Trop. Google Scholar Mackinnon, J.

Venoms of Scytodidae. Genus Loxosceles

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Chilean recluse spider

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Journal of the New York Entomological Society — Zootaxa — Prevalence of Loxosceles laeta in houses of central Chile. Schenone H. Biotechnological applications of brown spider Loxosceles genus venom toxins. Biotechnology Advances — Accidents with poisonous animals in Brazil by age and sex.

Journal of Human Growth and Development 25 1 : 54— Brown spiders and loxoscelism. Toxicon — Liste des arachnides recueillis par M. Revista Chilena de Historia Natural 4: 49— Loxosceles surca Gertsch, Araneae: Sicariidae en el norte de Chile.