Genus

Flexihydra Kozłowski, 1959

Klassificering

Organism group	Biota
Domain	Eukaryota
Kingdom	Animalia
Phylum	Hemichordata
Class	Pterobranchia
Subclass	Graptolithina
Superorder	Graptovermida
Order	Camaroidea
	Crustoidea
	Dendroidea
	Dithecoidea
	Graptoloidea
	Inocaulida
	Mastigograptida
	Rhabdopleuridae
	Tuboidea
Suborder	Sinograptina
Family	Chaunograptidae
	Cyclograptidae
	Cysticamaridae
	Dithecodendridae
	Idiotubidae
	Thamnograptidae
	Tubidendridae
	Wimanicrustidae
Genus	Calyxhydra
	Diplohydra
	Flexihydra
	Lagenohydra
	Neolagarograptus
	Palaeokylix
	Phragmohydra
	Podoliagraptus
	Stolonofolliculus