Original: The term "eusocial" was introduced in 1966 by Suzanne BatraBatra, S. W. T. 1966: Nests and social behavior of halictine bees of India (Hymenoptera: Halictidae).
Simplified: The term "eusocial" was introduced in 1966 by Suzanne Batra. Batra, S. W. T. 1966: Nests and social behavior of halictine bees of India (Hymenoptera: Halictidae).