The tabulate corals, forming the order Tabulata, are an extinct form of coral.

Among the fossils, perhaps the most spectacular are the eurypterids, an extinct form of scorpions.

Fair catches featured in some extinct forms of football, and they have been abolished in other modern codes.

It was the first time they showed results of breeding back successfully beyond the Cretaceous, and the big extinct forms had attracted a lot of interest.

However, most now agree that these extinct forms were probably other species in the Ducula genus.

Some forms, now extinct, were armored and were as large as modern crocodiles.

Ammonites are an extinct form of the subclass Cephalopod.

The group includes the well known heart urchins, as well as some less familiar and extinct forms.

A mammoth is an extinct form of elephant.

All living crocodilian species are eusuchians, as are many extinct forms.