IPA: /klæˈdɪstɪkli/
KK: /klædˈɪstɪkli/
In a way that relates to the classification of organisms based on common ancestry and evolutionary relationships.
The species were grouped cladistically to show their evolutionary connections.
Cladistically → It is formed from "clad" (from Greek "klados", meaning branch) and "-istic" (meaning pertaining to). The term refers to a method of classification based on common ancestry and branching evolutionary relationships.
Think of 'branches' ('clad') in a family tree to remember that 'cladistically' relates to classifying based on shared ancestry.