額がっ角かく

noun

rostrum (of a crustacean)

Technical zoological term for the forward-projecting spine or beak-like structure on the carapace of crustaceans such as shrimp and lobsters.

• エビの額がっ角かくは種しゅによって形かたちが異ことなる。

  The shape of a shrimp's rostrum differs depending on the species.