A new genus of highly derived pachycephalosaurian from western North America.

The condition of the arteries in the head is highly derived.

Actually, the multicolored spirals are merely the worm's highly derived respiratory structures.

The Tetraodontiformes are an order of highly derived ray-finned fish, also called the Plectognathi.

Neopilina is a highly derived genus of modern monoplacophoran.

In one early cladistic analysis it appears as an advanced or highly derived form.

Tangasaurids are known to have been a highly derived group of diapsids.

It is considered to have several characteristics which indicate is more primitive than other, more highly derived species.

That the minims behave in this way demonstrates the highly derived character of the species.

Although it reflects our early understanding of the Choristodera as a whole, it in fact represents a highly derived condition.