Yes, quite a few. Most commoningly sold in the shops is the American species called Triops longicaudatus which looks rather golden in colour. It grows up to 8cm (2 inches) and lives for up to 8 weeks. Then there is the Triops cancriformis species which is found throughout Europe and can grow up to 11cm (4 inches) and lives for longer (14 weeks) than its American cousin and is more green-brown. There is an Australian species called Triops australiensis which is rarely seen outside its country and is more copper-blue in colour. There are about 10-15 different species in total. But the others species are hard to get hold off. See our Triops Species section for more detail.