The sturgeon is a comparatively basal species of fish, which date back to the Cretaceous period.

The simplified linear feeding pathways that move from a basal trophic species to a top consumer is called the food chain.

The new basal species can then serve to assemble its own food chain that may be reciprocally invaded and excluded by the first species.

P. lundbergi is also the most basal species and is the sister taxon to the rest of the species in the genus.

Unlike in many more basal species, the feathers did not become narrower or more pointed at the tip.

It is considered a basal canid species, resembling ancestral forms of the family.

This is in contrast to previous suggestions of A. albipes being the most basal species in the genus.

It is one of the more basal species of Canis, having existed before most of the major clades split.

B. lindleyana resolved as one of the most basal species of B. subg.

Within the genus, the puffadder shyshark is the most basal species.