It was known only from fossil remains before the discovery of the living species in 1994.

"That kind of behavior is too subtle to learn from fossils."

In addition, there are four extinct families known only from fossils.

Each believes there is something valuable to learn from fossils.

It comprises eight families, three of which are known only from fossils.

A further two families are known only from fossils.

It is known from fossils and many examples of prehistoric art.

The history of the horse, worked out from American fossils, was merely the most spectacular.

A further 18 species are known only from fossils.

Two of the commonly recognized "classes" are known only from fossils.