I found the story about the alleged
venomous spider crabs on the Sky News web site.
Just before the text of the story there is a link that is beautifully ironic that says "why you can trust Sky News". The reason it is ironic is that there is no such thing as a venomous spider crab. That factoid got in because somebody googled "spider crab" and got hits for the crab spider, which is venomous (but not dangerous to humans).