acrania definition

  • noun:
    • Partial or complete absence of the skull.
    • Partial or complete lack of the head.
    • The lowest selection of Vertebrata, including the amphioxus, which no skull is present.
    • [NL., fem. sing.] In teratology, a malformation consisting in a whole absence of the bones and integuments developing the vault for the skull. In addition written acrany.
    • [capitalized] [NL., neut. pl.] A name recommended by Haeckel as a class designation for Amphioxus or Branchiostoma; a synonym of Myelozoa or Leptocardia (which see). Also known as Acephala. See Amphioxus and Branchiostoma.

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  • Sentence for "acrania"
    • At the ninth stage, called the…
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