In fact, it is the type species of this section.

The type species was estimated to be 33' (10m) long.

There are international codes which set out exactly how the naming of a type species is done.

The generic name is derived from that of the type species' author.

P. minor is similar in appearance to the type species and has been found from the same formation.

Today, it is restricted to a group of western Asian forms around the type species.

It has thus been proposed to change the type species to one of the main lineage to avoid this problem.

Its type species is called A. yildizae today, but that name was not established until 1981.

It was established by Heckel in 1843 without a type species.

It also serves as the type species of the genus.