Turtle Period: 3 Discovered in 1989by Dean Hickerson Glider Period: 4 Discovered in 1970by Richard K. Guy Hammerhead Period: 4 Anonymus discoverer Enterprise Period: 4 Discovered in 1993by Dean Hickerson Heavyweight Spaceship Period: 4 Discovered in 1970by John Conway Hivenudger Period: 4 Discovered in 1992by Hartmut Holzwart Lobster Period: 7 Discovered in 2011by Matthias Merzenich Spider Period: 5 Discovered in 1997by David Bell Big Glider Period: 4 Discovered in 1989by Dean Hickerson