しまいしがにじゃなかったです
縞石蟹じゃなかったです
shimaishi ganijanakattadesu

Noun
Desu Copula

The polite, past negative form of しまいしがに

1. It wasn't a striped spider crab.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana