Trapdoor spiders and funnel web spiders look very similar. The thing is that you can tell the diffrence by looking at the funnel web spider above and compare it to the other photos on the website. Just by looking at the abdomen of the spider, you can see that there are two things sticking at the end if it. That is where the silk comes out of the spider. Another difference is that funnel web spiders are very poisonous and they are one of the most dangerous spiders.