Abietinae-that is, none form a natural grouping.

Defining the limits so that Arius can form a natural grouping has always been a problem.

Though far from each other, they form a single territorial grouping under the sovereignty of the British Crown.

Yeasts do not form a single taxonomic or phylogenetic grouping.

Below is a simplified taxonomy (assuming that ungulates do indeed form a natural grouping) with the extant families in order of the relationships.

Architecturally, the homes form a cohesive grouping in that they are of similar scale, massing, materials and setback.

As was the case in previous studies, species of Leptosuchus formed a paraphyletic grouping, meaning that they did not represent one coherent genus.

In the living area, a sofa had been built into a window bay, with two royal blue canvas director's chairs arranged to form a "conversational grouping."

They are close competitors and form a competitive grouping.

Since then, it has been recognized that these two species form a natural, monophyletic grouping and were suggested to represent a new, undescribed genus.