With blunt primitive features, this crossopterygian is not noted for its beauty.
Many researchers agree that the primitive features in monotremes reflect an ancient origin.
The morphology of A. afarensis is a mosaic of primitive features and evolutionary developments shared by later hominins.
Furthermore, some members of the order have retained many primitive features, while others have evolved very advanced and specialized ones.
As Bambusoideae generally grow in forests and retain primitive features in their flowers, they were possibly the first grasses.
During the 1960s and '70s the unusual structure and chemical composition of the nuclear DNA of the Dinophyceae were interpreted as somewhat primitive features.
Although all known African fossils are of modern humans, a 13,000-year-old skull from the Iwo Eleru site in Nigeria has certain primitive features.
Those dinosauromorphs that are not considered to be true dinosaurs are the most basal members of the group, and they have generally primitive features compared with the dinosaurs.
Tapirs have primitive features, such as four hoofed toes in the forefoot and three in the hind, and they have rather simple molar teeth.
Relationships to other mammalian groups have been difficult to determine because of the puzzling combination of primitive features and specialized characteristics, a phenomenon known as mosaic evolution.
A research team led by William Jungers, an American paleoanthropologist concluded that "the foot of Homo floresiensis exhibits a broad array of primitive features that are not seen in modern humans of any body size".
