acrania a·cra·ni·a (ā-krā’nē-ə, ə-krā’-)
Congenital absence of all or a part of the skull.
a·cra’ni·al adj.
Historical Examples

Hence we may call it after the acrania as well as after the Tangles.
The History of Creation, Vol. II (of 2) Ernst Haeckel

It is absent as a distinct gland in the acrania and Cyclostomata.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 Various

The skull-less animal lancelet, which is still living, affords a faint idea of the members of this group (acrania).
Was Man Created? Henry A. Mott

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