Children (26 direct children, 1379 direct and indirect children):
Brissopsidae
Asterostomatidae
(tree size 7)
Brissidae
(tree size 156)
Hemiasteridae
(tree size 141)
Schizasteridae
(tree size 238)
Pourtalesiidae
(tree size 65)
Paleopneustina
(tree size 109)
Micrasteridae
(tree size 69)
Micrasterina
(tree size 45)
Prenasteridae
(tree size 58)
Palaeostomatidae
(tree size 17)
Toxasteridae
(tree size 134)
Brissidina
(tree size 300)
Hemiasterina
Holasterina
Asterostomatina
Toxasterina
Somaliasteridae
(tree size 11)
Palaeostomidae
Enichaster
(tree size 1)
Brissopatagus
(tree size 2)
Gillechinus
Migliorinia
Plesiopatagus
Cardiopatagus
Bathyspatus