Sinocylindra

Sinocylindra
Temporal range: Ediacaran–Cambrian Series 2
Fossilized specimen of Sinocylindra
Scientific classification Edit this classification
Clade: Viridiplantae
Division: Chlorophyta
Genus: †Sinocylindra
Chen and Erdtmann, 1991

Sinocylindra is an extinct genus of macroalgae that existed between the Ediacaran and Middle Cambrian periods. It is a part of the Chengjiang biota in the Maotianshan Shales in Yunnan, China. Only two species, S. yunnanensis and S. linearis, are described.

Species

Sinocylindra yunnanensis was a cylindrical macroalgae 0.2-0.35 mm wide, that could reach up to 20-40 mm long.[1] Its surface is smooth, and it was likely flexible, as specimens have been found coiled and curved.[2][3] It was previously thought by some that S. yunnanensis might be a prokaryotic species in the Siphonophycus genus,[4] however due to elements of its morphology such as the size and length of the species, it was determined to most likely be a eukaryotic algae of a previously unknown genus.[1] S. yunnanensis lived roughly between 635-516 million years ago.[5]

Sinocylindra linearis, like yunnanensis, was cylindrical in shape, with a diameter ranging from 0.3-2.0mm, and a length of 5.0-50 mm.[2] It was probably firmer and less flexible than yunnanensis as some specimens found were almost completely straight.[2]

Discovery

Sinocylindra yunnanensis was first described in 1991, found in the Upper Doushantuo shales at Chengjiang, in the Chinese province of Yunnan.[1] Since its discovery, a number of fossils across Southern China have been found, as well as a specimen in the Drumian Marjum formation in Utah, United States.[6]

Sinocylindra linearis was described by researchers in 2017 after being found in the Ediacaran Miaohe member in southern China,[7] where one hundred and twenty-eight specimens were found.[2] The name linearis was given due to the straight, rigid nature of the species.

See also

References

  1. ^ a b c Xiao et al. 2002, p. 368.
  2. ^ a b c d Ye et al. 2019, p. 41.
  3. ^ Ye et al. 2019, p. 30.
  4. ^ Xiao et al. 2002, p. 349.
  5. ^ "Sinocylindra". Mindat.org. Retrieved October 16, 2024.
  6. ^ Wang et al. 2022, p. 9.
  7. ^ Ye et al. 2019, p. 1.

Works cited