Aglossata it is the second most primitive lineage of lepidoptera; being first described in 1952 by Lionel Jack Dumbleton.

But this oldest-known insect fossil is not a member of the most primitive lineage of insects.

They are considered the most primitive extant lineage of Lepidoptera (Kristensen, 1999).

In our time of need, a young, well-formed man of primitive lineage is to appear, riding a pooka he has tamed.

The most primitive lineages are highly endangered.

This taxon was traditionally thought to be a primitive lineage, from which all the larger bodied platyrrhines evolved.

Howeve,r some features are so primitive that some researchers have suggested it belongs to a more primitive lineage of short-tailed birds (pygostylians).

They belonged to an evolutionary lineage more primitive than modern penguins.

Originally these animals were included under the order Cotylosauria, and were considered the most primitive and ancestral lineage of reptiles.

Some Botanists believe P. complanatum is a survivor from a very primitive lineage of fern-like vascular plants.