PBDB Taxon

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Byakudansauropus

Reptilia

Taxonomy

Byakudansauropus was named by Azuma and Takeyama (1991). It is considered to be a form taxon. Its type is Byakudansauropus shiraminensis.

It was considered a nomen dubium by Tsukiji et al. (2019).

It was assigned to Theropoda by Azuma and Takeyama (1991) and Romero Molina et al. (2003); and to Theropoda by Fujita (2008).

Species

B. shiraminensis (type species)

Synonyms

Byakudansauropus shiraminensis was named by Azuma and Takeyama (1991). It is considered to be a form taxon. Its type specimen is ISBEV003, a footprint, and it is a trace fossil. Its type locality is Byakodan, Hakusan tracksite, which is in a Valanginian/Barremian fluvial-deltaic sandstone in the Akaiwa Formation of Japan. It is the type species of Byakudansauropus.

It was considered a nomen dubium by Lockley and Matsukawa (1998); it was considered a nomen dubium by Tsukiji et al. (2019).

Synonymy list

Year	Name and author
1991	Byakudansauropus Azuma and Takeyama p. 42
1991	Byakudansauropus shiraminensis Azuma and Takeyama p. 42 figs. 14; Pl. 2:1
2003	Byakudansauropus Romero Molina et al. p. 25
2008	Byakudansauropus Fujita p. 33
2008	Byakudansauropus shiraminensis Fujita p. 33

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota

Rank	Name	Author
—	Sauropsida
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Theropoda	()
genus	Byakudansauropus

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Byakudansauropus Azuma and Takeyama 1991

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Invalid names: Byakudansauropus shiraminensis Azuma and Takeyama 1991 [nomen dubium]

Diagnosis

Reference	Diagnosis
Y. Azuma and K.-i. Takeyama 1991	A new ichnogenus Byakudansauropus is monotypic at present, bipedal, with tridactyl small pes imprint, lacking digits I and V; mesaxonic foot structure. The digit III is longest.

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Entire body:

yeso

Adult length:

10 to < 100o

Adult width:

1.0 to < 10o

Adult height:

1.0 to < 10o

Architecture:

compact or denseo

Ontogeny:

accretion, modification of partso

Grouping:

solitaryo

Environment:

terrestrialo

Locomotion:

actively mobileo

Life habit:

ground dwellingo

Diet:

carnivoreo

Reproduction:

oviparouso

Dispersal:

direct/internalo

Dispersal 2:

mobileo

Created:

2004-12-14 12:50:08

Modified:

2004-12-14 14:50:08

Source: o = order

Reference: Marsh 1875

Age range: base of the Valanginian to the top of the Barremian or 139.80000 to 125.00000 Ma

Collections: one only

Time interval	Ma	Country or state	Original ID and collection number
Valanginian - Barremian	139.8 - 125.0	Japan (Ishikawa)	Byadkudansauropus shiraminensis (60521)