In the original Gradius, Rugal is the second enemy to be encountered. They often come in groups of three, and even though slow compared to other enemies, will home toward the Vic Viper and even turn around to get to it, although they don't shoot. They also come in a red variety that drops a capsule when destroyed.
Rugal appears in every volume of the Salamander anime. The color of the Rugal has been changed into yellow.