Genus

Tetractocrinus Jaekel, 1918

Aiheeseen liittyvät julkaisut
Arendt, Yu. A. 1976. Ordovikskie iglokožie gemistreptokrinoidei. Bulletin of the Moscow Society of Naturalists. Geological series 51, 2, 63-84.
List of species
1. Tetractocrinus compactus Jaekel, 1918 | Volkhov Stage→Kunda Stage
Luokittelu
Organism groupBiota
KingdomAnimalia
PhylumEchinodermata
SubphylumPelmatozoa
ClassCrinoidea
OrderHemistreptocrinida
FamilyHemistreptocrinidae
GenusHemistreptocrinus
Nonparactocrinus
Parorthocrinus
Tetractocrinus
Speciescompactus