ACRANIA
Source: 567
‖A‐cra″ni‐a (�), n. [[NL., from Gr. ἀ priv. + � skull.]] 1. 1. (Physiol.) Partial or total absence of the skull.
2. 2. pl. (Zoöl.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists.
Source: 567
‖A‐cra″ni‐a (�), n. [[NL., from Gr. ἀ priv. + � skull.]] 1. 1. (Physiol.) Partial or total absence of the skull.
2. 2. pl. (Zoöl.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists.