This group of organisms has the property of monophyly (from the Greek for "single clan"), so it may also be referred to as a monophyletic group. A clade or monophyletic group is easy to identify ...
A monophyletic group can be separated from the root with a single cut, whereas a non-monophyletic group needs two or more cuts.
Neognathostomata have traditionally been divided into a monophyletic Clypeasteroida and a paraphyletic Cassiduloida. Cladistic analysis (Smith 2001) suggests that cassiduloids are a grade taxon ...
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