acrania 無顱畸形
acra·nia /(ˈ)eˈkrenɪə/ 名詞 無顱蓋
A·cra·ni·a n. 1. Physiol. Partial or total absence of the skull. 2. pl. Zool. The lowest group of Vertebrata, including the amphioxus, in which no skull exists. ◄ ►