Cricoidoscelosus

Cricoidoscelosus; Temporal range: Early Cretaceous, Barremian–Aptian PreꞒ Ꞓ O S D C P T J K Pg N
	Specimen from the Yixian Formation of China
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Malacostraca
Order:	Decapoda
Suborder:	Pleocyemata
Infraorder:	Astacidea
Superfamily:	Astacoidea
Genus:	†Cricoidoscelosus; Taylor et al., 1999
Binomial name
	†Cricoidoscelus aethus; Taylor et al., 1999
Synonyms
	"Mongolarachne" chaoyangensis? Cheng et al., 2019;

Cricoidoscelosus^[1]^[2] is an extinct genus of crayfish discovered in the Yixian Formation in China, with only the type species, C. aethus, known, that may be one of, if not, the oldest known fossil crayfish to date.^[3]^[4] A possible synonym of Cricoidoscelus is "Mongolarachne" chaoyangensis.^[3]

Cricoidoscelosus was initially believed to be Late Jurassic (Tithonian) in age,^[4] but it is now confirmed to have been Early Cretaceous (Barremian-Aptian) in age.^[3]

References

^ "Cricoidoscelosus Taylor, Schram & Shen, 1999". www.gbif.org. GBIF. Retrieved 25 August 2021.
^ "Fossilworks: Cricoidoscelosus". fossilworks.org. Fossilworks. Retrieved 17 December 2021.
^ ^a ^b ^c Paul A. Selden; Alison N. Olcott; Matt R. Downen; Dong Ren; Chungkun Shih; Xiaodong Cheng (2019). "The supposed giant spider Mongolarachne chaoyangensis, from the Cretaceous Yixian Formation of China, is a crayfish" (PDF). Palaeoentomology. 2 (5): 515–522. doi:10.11646/palaeoentomology.2.5.15.
^ ^a ^b Taylor, R.S., Schram, F.R. & Shen, Y.B. (1999) A new crayfish family (Decapoda: Astacida) from the Upper Jurassic of China, with a reinterpretation of other Chinese crayfish taxa, Paleontological Research, 3, 121–136.

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[1] "Cricoidoscelosus Taylor, Schram & Shen, 1999". www.gbif.org. GBIF. Retrieved 25 August 2021.

[2] "Fossilworks: Cricoidoscelosus". fossilworks.org. Fossilworks. Retrieved 17 December 2021.

[Two19-3] Paul A. Selden; Alison N. Olcott; Matt R. Downen; Dong Ren; Chungkun Shih; Xiaodong Cheng (2019). "The supposed giant spider Mongolarachne chaoyangensis, from the Cretaceous Yixian Formation of China, is a crayfish" (PDF). Palaeoentomology. 2 (5): 515–522. doi:10.11646/palaeoentomology.2.5.15.

[Taylor99-4] Taylor, R.S., Schram, F.R. & Shen, Y.B. (1999) A new crayfish family (Decapoda: Astacida) from the Upper Jurassic of China, with a reinterpretation of other Chinese crayfish taxa, Paleontological Research, 3, 121–136.

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Cricoidoscelosus

References

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