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Loxosceles intermedia
Loxosceles intermedia, known in English as Brazilian recluse spider, is a highly venomous spider edemic to South America.

Description
They are characteristic of the brown spider Loxosceles intermedia, predominant species that is better distributed in the municipality of Curitiba, Paraná (Fischer 1994): medium size of 16 mm, few hairs on the coloring body reddish-brown, characteristic hair arrangement in the cephalothorax region, which in turn has less curved side grooves, and the presence of two receptors seminal in the defendants (Mello-Leitão, 1934). Adult males usually grow up to 9.5 mm,

Behavior
They are gentle, only biting when pressed against the body. For example, when someone is dressing, putting on shoes or accidentally lying on the spider while sleeping.They are sedentary animals, presenting nocturnal habit and behavior defensive It feeds on small insects and other arthropods such as scorpions, capturing them with its strong webs.

Reproduction
They have sexual dimorphism, being normally females larger than males. These present palps with the modified tarsi, pedipalps, specialized in the transfer of sperm (Gilbert, 1997). L. intermedia breeds preferentially in the hottest months of the year, being able to lay an average of 20 eggs per laying (Andrade et al., 1999), of which young spiders hatch in 46 days (Fischer 1996). The female builds a web complex, the ooteca, in the shape of a bag, where the eggs are packed in the posture moment. The early stages of embryonic development for this species were investigated by Ferreira (2001), who described eggs of the type centrolithic, superficial cleavage, in addition to blastulation, for this species of spider. After hatching, the pre-larvae still undergo two seedlings before leaving the ooteca in search of food; another 4 to 7 seedlings will occur before the animals reach sexual maturity (Fischer, 1996).

Range and habitat
It lives in temperate and warm regions of central South America, in southeastern and southern Brazil and Argentina. It is most active during the hot season. It is nocturnal and sedentary, weaving an irregular white fabric under stones, between trunks or rubble, under the bark of trees (especially of the Eucalyptus genus) 11 or in human constructions, such as chicken coops, sheds, garages, etc. It is easily hidden behind photos or furniture, in the cracks in the walls, etc.

Bites to humans
Like L. laeta, the Brazilian recluse has a very dense magnitude of sphingomyelinase D in its venom, composed of proteolytic and hemolytic toxins. which makes her venom the second most toxic of the Loxosceles genus, her bites often result in serious local and systemic injuries, or even deaths. Some of the symptoms described include local pain, inflammation, redness, necrosis, fever, heart problems, hemolysis, minor bleeding, kidney failure and and vascular collapse.