Children (19 direct children, 20 direct and indirect children):
Icelus perminovi
Icelus stenosomus
Icelus ecornis
Icelus toyamensis
Icelus sekii
Icelus ochotensis
Icelus spatula
Icelus canaliculatus
Icelus cataphractus
Icelus gilberti
Twohorn sculpin
Icelus bicornis
Icelus armatus
Icelus uncinalis
(tree size 1)
Icelus euryops
Icelus mandibularis
Icelus rastrinoides
Icelus spiniger
Icelus scutiger
Icelus vicinalis