Castorocauda
Castorocauda (binomen a Ji et al anno 2006 inventum) est genus mammalium exstinctum.

Systema taxinomicum Animalis 
Imperium: Eukaryota 
Regnum: Animalia 
Gradus: Metazoa 
Subgradus: Eumetazoa 
Subregnum: Bilateria 
Infraregnum: Eucoelomata 
Supraphylum: Deuterostomia 
Infraphylum: Chordonia 
Phylum: Chordata 
Subphylum: Vertebrata 
Infraphylum: Gnathostomata 
Supraclassis: Tetrapoda 
Infraclassis: Amniota 
Classis: Mammaliaformes
Ordo: † Docodonta
Genus: † Castorocauda (Ji et al., 2006)

Species 
 †Castorocauda lutrasimilis (Ji et al., 2006)

Notae 
 Ji, Q., Z.-X. Luo, C.-X. Yuan, A. R. Tabrum. February 24, 2006. "A swimming mammaliaform from the Middle Jurassic and ecomorphological diversification of early mammals". Science, 311:5764 pp.1123-1127.
 McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
–Columbia University Press, New York, 1997, xii-631

Mammalia exstincta