Some of these, such as Euparkeria, were small and lightly built, while others, such as Erythrosuchus, were as big as or bigger than the largest therapsids.
Κάποια, όπως η Ευπαρκέρια, ήταν μικρά και ελαφρά, ενώ άλλα, όπως ο Ερυθόσουχος, ήταν μεγάλα ή μεγαλύτερα από τα μεγαλύτερα θηριαψιδωτά.