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Hobo spider

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Hobo spider
Hobo female1.jpg
Scientific Classification
Binomial Name

Tegenaria agrestis

Hobo male1.jpg
Male Hobo

The Hobo spider is known as an aggressive spider that comes into the houses of people and leaves a very nasty bite. This spider can be fairly large with the female can reach up to 15mm. The Hobo spider catches its prey by forming silk traps that it will wait for an insect to fall in. Then when the insect is trapped in the webs he will use paralyzing venom and wrap its prey.

Anatomy

The female hobo spider can reach up to 15 mm, while the male can only reach up to 11mm. They have an abdomen which is the second main body part. Then they have a palp wich is what they use for reproduction purposes. Also immature spiders don't have anything in their reproductive areas. The palp is also the round ball like structure on the end of the two front feelers. They have a sternum which is located on the bottom of the cephalothorax, which is the flat structure that is surrounded by the legs. Finally the females have an Epigynum which is the reproductive part of the female hobo spider. The Egipynum is a hard, dark colored structure in the middle of the abdomen by the cephalothorax. The hobo spider has a light stripe running down the middle of their sternum. Also they have indistinct patterns and legs of the hobo spider are colorful. [1]

Reproduction

The hobo spider usually enters a home when it is looking for mates. The hobo spiders preform this around the time of August. The male hobo spider gets eaten after every time it mates. Also the males life only exists for a few months while the female lives for two years. When the female hobo spider lays eggs she lays seven white eggs. She will tangle these eggs in a web sac and dangle them from something. The mating of the hobo spider happens in autumn. The male hobo spider uses his palps to inject sperm during the mating process. First he will build a very small triangular web where he will then take a drop of sperm and place it on the web. Then once the drop of sperm is on the web he will use one of his palps the stick in the sperm. The male hobo spider will put the sperm in the females two egg based structure. The female hobo spider will wait for the eggs to be fertilize before placing them in the web egg sac. [2]

Ecology

The hobo spider makes silk nests to prey in. They are mainly found in the homes of humans because they are looking for mates. These spiders usually are not looking to attack humans, as we know them to, because bites are mainly found on people who step on them. The trap that they use to catch prey is very unique because it makes a sheet of silk pointing upwards so that its prey falls into it. After the prey falls into the trap the spider will be waiting in a retreating tube until the insect gets tangled up in all the webs. When the insect is tangled in the webs the spider will jump out and inject the paralyzing venom. The usual prey of the hobo spider includes carpet beetles, earwigs, houseflies and silverfish. The hunting habits are always the same even if they live indoors or out in the fields, gardens and hedges. [3]

Aggressiveness/venom

The hobo spider is a very aggressive spider and is also known as the aggressive house spider. The hobo spider is so aggressive because it is usually tending an egg sac at the time. They generally do not bite unless to protect themselves, and in the a lot of cases the hobo spider does not actually inject venom when they bite. It has been said that in some parts of the U.S. nearly all bites said to be the brown recluse spider are really the hobo spider. Also, the hobo spider bite causes necrosis in humans, but it is believed by some that hobo spiders are dangerous to humans. The necrosis in other cases are similar to, or less than, the ones caused by the brown recluse spider, and in bad cases the bite can take months to heal. [4]


References