Merrem considered it to be one of three groups of Pholidota (reptiles), the other two being Testudinata (turtles) and Squamata (lizards and snakes).
Merrem considerábao un dos tres grupos de Pholidota (réptiles); os outros dous eran Testudinata (tartarugas) e Squamata (lagartos e serpes).