app/models/nomenclatural_rank/icn/higher_classification_group/subkingdom.rb
class NomenclaturalRank::Icn::HigherClassificationGroup::Subkingdom < NomenclaturalRank::Icn::HigherClassificationGroup
def self.parent_rank
NomenclaturalRank::Icn::HigherClassificationGroup::Kingdom
end
def self.valid_parents
[NomenclaturalRank::Icn::HigherClassificationGroup::Kingdom.to_s]
end
end