Bystrowiana

Bystrowiana is an extinct genus of bystrowianid chroniosuchian from upper Permian deposits of Vladimir Region, Russia^[1] and Jiyuan, China.^[2] Chroniosuchians are often thought to be reptiliomorphs,^[3] but some recent phylogenetic analyses suggest instead that they are stem-tetrapods.^[4] The genus is named in honour of the Russian paleontologist Alexey Bystrow. It was first described by Vyushkov in 1957 and the type species is Bystrowiana permira.^[1] Two species—B. permira and B. sinica—are known.^[5]

Bystrowiana Temporal range: Lopingian to Early Triassic
Bystrowiana permira
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Reptiliomorpha (?)
Order:	†Chroniosuchia
Family:	†Bystrowianidae
Genus:	†Bystrowiana Vyushkov, 1957
Species
†B. permira Vyushkov, 1957 (type) †B. sinica Young, 1979

Bystrowiana is known from a 30 cm skull, which suggests it was a large animal, up to 2.5 m (8.2 ft) in total body length.^[6]

Phylogeny

Bystrowiana in a cladogram after Novikov (2018) showing internal relationships of bystrowianids based on differences in their osteoderms:^[7]

Bystrowianidae	Dromotectinae Axitectinae Bystrowianinae Bystrowiella Synesuchus Vyushkoviana Bystrowiana