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Answer for the clue "Comprising all vertebrates with upper and lower jaws ", 13 letters:
gnathostomata

Word definitions for gnathostomata in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Gnathostoma \Gna*thos"to*ma\, n. pl. [NL., from Gr. gna`qos the jaw + ?, ?, the mouth.] (Zo["o]l.) A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which ...

Wikipedia Word definitions in Wikipedia
The Gnathostomata are a superorder of sea urchins , including the familiar sand dollars . Gnathostomatans are irregular in shape, but unlike other irregular sea urchins, possess a feeding lantern. The mouth is located in the centre of the lower surface, ...