Hi, I wonder if anyone can solve the mystery of this little creature I found on the floor of my living room. It's a deep orange/brown colour. Only about 7mm long. I have never seen anything quite like it. The legs are thick and it's almost prawn like. Also reminds me of a scorpion. I have only found one of these so far so hopefully it's a one off and not a new poisonous breed I have living in my house! Thanks in advance!