Children (20 direct children, 20 direct and indirect children):
Cookeconcha contorta
Cookeconcha antiquus
Cookeconcha cookei
Cookeconcha decussatulus
Cookeconcha elisae
Cookeconcha henshawi
Cookeconcha hystricellus
Cookeconcha hystrix
Cookeconcha intercarinata
Cookeconcha jugosus
Cookeconcha lanaiensis
Cookeconcha luctiferus
Cookeconcha nudus
Cookeconcha paucicostata
Cookeconcha paucilamellatus
Cookeconcha ringens
Cookeconcha stellulus
Cookeconcha subpacificus
Cookeconcha thaanumi
Cookeconcha thwingi