The ShodaiAngira's name comes from shodai (初代?), meaning first generation, and Angira, which comes from Anguirus's Japanese name, Angirasu (アンギラス?).
The ShodaiAngira is thinner than later versions. The nose on the suit is a little bigger than the later suits, and the carapace of the suit flops up and down during the filming. A notable detail on the carapace is that all the spikes are all straight in a row.