It is unclear whether they form a natural group of organisms as they are poorly known.
12.
"Platycerium " have diverged into four natural groups.
13.
Ji Qiang and Larry Martin have continued to refer to the Sauriurae as a valid natural group.
14.
"It's a very natural group,"
15.
A collection of sarsen stones north of the village may be a prehistoric tomb but is more likely a natural group.
16.
It is not a natural group, but is instead a paraphyletic assemblage of the early members of several ray-finned fish lineages.
17.
Its contents do " not " form a natural group but rather a motley assemblage of songbirds of similar shape and habits.
18.
The Abyssocottidae itself appears as a natural group within this radiation, except that also the genus " Batrachocottus " should be included.
19.
Phylogenetic analysis indicates that this taxon is one of the four natural groups within the Gastropoda : Vetigastropoda, Caenogastropoda, Patellogastropoda, and Heterobranchia.
20.
By the early 20th century, some paleontologists, such as Friedrich von Huene, no longer considered carnivorous dinosaurs to have formed a natural group.
