Through comparisons with the other discoidal trilobozoans, it appears the different "arm" patterns on each genus/species occurred due to growth arresting or progressing at different stages of developmental growth.
Melalui perbandingan dengan trilobozoans discoidal lainnya, tampak berbeda "lengan" pola pada masing-masing genus/spesies terjadi karena pertumbuhan menangkap atau maju di berbagai tahap pertumbuhan perkembangan.