Several groups are identified, but there is no consensus of their phylogenetic relationship.

The phylogenetic relationship of the order remains controversial and elusive.

These observed similarities form the basis for the suggested phylogenetic relationship.

Phylogenetic relationships between these families are difficult to determine.

There is still uncertainty as to its phylogenetic relationships with other similar genera.

So far little work has been done on detailed phylogenetic relationships between the various taxa.

The phylogenetic relationship between Trichoplax and other animals has been debated for some time.

The issue is still under debate, and the phylogenetic relationships among bee families are poorly understood.

The exact phylogenetic relationship between plants, animals and fungi is not well understood.

The exact phylogenetic relationship between the three is disputed.