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W is for wandering spiders (family Ctenidae)! #DailySpider

This is Phoneutria, one of the few spiders with venom that is very dangerous to humans.

Though we do have a few wandering spider species in North America, Phoneutria is only found in Central & South America.
Here is a great photo and blog post about Phoneutria by @wizentrop! (Note that he did not actually get bitten).

gilwizen.com/creativity-pho…
Phoneutria are quite defensive & will bite readily if threatened, but not all bites are severe.

During fieldwork in French Guiana, @Ibycter had 2 assistants bitten by these spiders (hiding in boots left out overnight). Both bites were painful & unpleasant, but not too serious.
Read 13 tweets
Today's #DailySpider is the brown recluse, Loxosceles reclusa (family Sicariidae).

These secretive, six-eyed #spiders are almost certainly the most feared & misunderstood in North America. brown, six-eyed spider with violin-shaped dark mark on its head, sitting on a rock
Spiders in the genus #Loxosceles* are considered medically important because their venom can be harmful to humans (unlike that of the vast majority of other spiders).

*There are several species in North America. Pictured here: the Arizona recluse (L) & Big Bend recluse (R). brown spider with 6 black eyes and dark violin marking on head sitting on rockclose up of lighter brown spider with 6 dark eyes (in 3 pairs) and violin-shaped marking on head
Recluse spiders are not aggressive. They do not go around looking for people to bite. They feed on insects & other arthropods, not human blood. #DailySpider brown recluse spider with red-eyed fruit fly (Drosophila) in its jaws, sitting on a rock
Read 14 tweets

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