Cricoidoscelosus

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]

Cricoidoscelosus
Temporal range: Early Cretaceous,
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 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]

Taxonomy

"Mongolarachne" chaoyangensis

In 2019, a supposed new species of the spider Mongolarachne, "Mongolarachne" chaoyangensis was described from the Yixian Formation in China.[5] However, in a later publication that same year, when the specimen was subject to fluorescence microscopy, it was shown that the specimen was a forgery using specimen D3088, a specimen of Cricoidoscelosus, as a base, that had been painted to look like a spider, and as such the species was a junior synonym of Cricoidoscelosus.[3]

References
  1. "Cricoidoscelosus Taylor, Schram & Shen, 1999". www.gbif.org. GBIF. Retrieved 25 August 2021.
  2. "Fossilworks: Cricoidoscelosus". fossilworks.org. Fossilworks. Retrieved 17 December 2021.
  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. S2CID 208124459.
  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.
  5. Xiaodong Cheng; Sizhao Liu; Wenjuan Huang; Li Liu; Hongming Li; Yinxian Li (2019). "A new species of Mongolarachnidae from the Yixian Formation of western Liaoning, China". Acta Geologica Sinica (English Edition). 93 (1): 227–228. doi:10.1111/1755-6724.13780. Archived from the original on 29 April 2019.


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