to fully understand evolutionary grades, one must first get a better understanding of phylogenetics: the study of the evolutionary history and relationships...

Development and Evaluation (GRADE) approach Evolutionary grade, a paraphyletic group of organisms Graded bedding, a description of the variation in grain...

wastebasket taxon may in some cases be retained as the designation of an evolutionary grade, however. The term was coined in a 1985 essay by Stephen Jay Gould...

studies have shown a supporting amount of evidence that Miacoidea is an evolutionary grade of carnivoramorphs that, while viverravids are monophyletic basal...

scientists believed that modern ungulates were descended from an evolutionary grade of mammals known as the condylarths. The earliest known member of...

protists were at that time thought to be "primitive forms", and thus an evolutionary grade, united by their primitive unicellular nature. Understanding of the...

no longer considered a valid grouping, but rather a paraphyletic evolutionary grade of basal mammals and mammaliaform cynodonts. Most of the animals in...

distinct clade—a group of closest relatives and nothing else—but an evolutionary grade instead. As such, it is abandoned in modern treatments, being replaced...

family should not be confused with Protosuchia, which is an informal evolutionary grade of primitive crocodiliforms Triassic protosuchids are known from Lesotho...

Madagascar, but are also found throughout Africa and in Asia. Being an evolutionary grade rather than a clade, the prosimians are united by being primates with...