Acrania
2 of 2noun plural
in some classifications
: a division of the phylum or subkingdom Chordata comprising the hemichordates, tunicates, and lancelets and including all the chordates without true heads and anterior brains compare vertebrata
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“Acrania.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/acrania. Accessed 22 Nov. 2024.
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