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The latter encloses either the entire body or only the anterior end.

They have no true head, although the anterior end is often slightly wider than the body.

The teeth were only found at the anterior end of the jaws.

The anterior end of the shell is darkened, and may be brown or purple.

They may have an indentation on each side of the body near the anterior end.

The siphonal canal at the anterior end is usually short.

Canalipalpata have a head located at the anterior end of the body.

The apex of the shell is at the anterior end.

The anterior end of the shell is blue-black, blue or brown in color.

The anterior end is not separated as a distinct head.