Biology:Shokawa

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Short description: Extinct genus of reptiles

Shokawa
Temporal range: Early Cretaceous, Berriasian
Artist's reconstruction
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: †Choristodera
Family: †Hyphalosauridae
Genus: †Shokawa
Evans & Manabe, 1998
Type species
†Shokawa ikoi
Evans & Manabe, 1998

Shokawa is an extinct genus of choristoderan diapsid reptile, known from the Lower Cretaceous of Japan. It is only known from one species, Shokawa ikoi. The only known remains are a postcranial specimen lacking the skull, discovered at the KO2 locality in sediments belonging to the Okurodani Formation near the village of Shokawa in Gifu Prefecture. Shokawa possessed a long neck with at least 16 cervical vertebrae, and closely resembles and is closely related to the smaller choristoderan, Hyphalosaurus.[1][2] The generic name refers to the village near where it was found, while the specific name honors the collector of the first specimen, one Mr. Ikoi Shibata.

Phylogeny from the analysis of Dong and colleagues (2020):[3]

Choristodera
 

Cteniogenys sp.

 
 
 

Heishanosaurus pygmaeus

 
 

Coeruleodraco jurassicus

 
 
Neochoristodera
 

Ikechosaurus pijiagouensis

 
 

Ikechosaurus sunailinae

 
 

Tchoiria namsari

 
 

Tchoiria klauseni

 
Champsosaurus
 

C. gigas

 
 

C. albertensis

 
 
Simoedosaurus
 

S. lemoinei

 
 

S. dakotensis

 
 
 
"Allochoristodera"
 

Monjurosuchus splendens

 
Philydrosaurus
 

P. proseilus

 
 

P. proseilus

 
 
 
Lazarussuchus
 

L. inexpectatus

 
 

Lazarussuchus sp.

 
 

L. dvoraki

 
 
 
 

Khurendukhosaurus orlovi

 
 

Hyphalosaurus sp.

 
 
 

Hyphalosaurus lingyuanensis

 
 

Shokawa ikoi

 
 
 
 
 
 
 
 


References

  1. ↑ Evans, Susan E.; Manabe, Makoto (January 1999). "A choristoderan reptile from the Lower Cretaceous of Japan". Special Papers in Palaeontology. https://www.researchgate.net/publication/228117764. 
  2. ↑ The dentary of a Choristodere (Reptilia: Archosauromorpha) from the Okurodani Formation, Tetori Group (Lower Cretaceous) of Japan [1]
  3. ↑ Dong, Liping; Matsumoto, Ryoko; Kusuhashi, Nao; Wang, Yuanqing; Wang, Yuan; Evans, Susan E. (2020-08-02). "A new choristodere (Reptilia: Choristodera) from an Aptian–Albian coal deposit in China" (in en). Journal of Systematic Palaeontology 18 (15): 1223–1242. doi:10.1080/14772019.2020.1749147. ISSN 1477-2019. https://www.tandfonline.com/doi/full/10.1080/14772019.2020.1749147. 

Template:Eureptilia

Wikidata ☰ Q16745535 entry