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Amphioxus :: Amphioxus (n.) A fishlike creature (Amphioxus lanceolatus), two or three inches long, found in temperature seas; -- also called the lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebrae, nor red blood. It forms the type of the group Acrania, Leptocardia, etc..

Acranial :: Acranial (a.) Wanting a skull.

Acrania :: Acrania (n.) Partial or total absence of the skull.

Supracretaceous :: Supracranial (a.) Situated above, or in the roof of, the cranium..

Intracranial :: Intracranial (a.) Within the cranium or skull.

Acrania :: Acrania (n.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists..

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