Curviacus
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| Curviacus Temporal range: Late Ediacaran
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Scientific classification 
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| Domain: | Eukaryota |
| (unranked): | incertae sedis |
| Informal group: | †Palaeopascichnida |
| Genus: | †Curviacus Shen et al., 2017 |
| Species: | †C. ediacaranus
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| Binomial name | |
| †Curviacus ediacaranus Shen et al., 2017
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Curviacus is a genus of Ediacaran organism of uncertain lineage that displays a modular body plan consisting of crescent-shaped chambers. It contains a single species, Curviacus ediacaranus.
Etymology
The genus name Curviacus references the shape of the crescent chambers; coming from Latin curvus meaning curved and acus meaning needle.[1]
Description
These fossils occur on bituminous limestone on the bedding surface. The fossilized specimen has calcispar walls with the inner chambers filled with micrite.[1] The walls are raised because the calcispar does not erode as easily. C. ediacaranus is a slightly oblong macrofossil that ranges from 5–14 cm in length. It is characterized by its curved or crescent-shaped chambers that occur arranged in a series with the chambers sharing walls. All of the chambers are convex in the same direction. Each chamber is narrow ranging ~1-3mm in width. Chamber length can be consistent or inconsistent. Inconsistencies can give a false impression of branching.[1] Additionally, the walls of the chambers sometimes converge laterally.
Phylogeny
The phylogeny of this fossil is not yet known. Some scientists believe the genus to be a coralline algal or fungal stem group.[1]
Occurrence
C. ediacaranus is from the late Ediacaran. The fossil C. ediacaranus has been found in the Shibantan Member of the Dengying Formation.[1] The Shibantan Member is the bituminous limestone section of the formation.[2] It is unusual for Ediacaran biota to be preserved in limestone. As such, C. ediacaranus is the only Palaeopascichnus fossil to be reported from carbonate rock rather than siliclastic rock.[1] This special type of fossilization allows for 3-dimensional analysis.[1]
References
- ^ a b c d e f g Shen, B.; Xiao, S.; Zhou, C.; Dong, L.; Chang, J.; Chen, Z. (2017). "A new modular palaeopascichnid fossil Curviacus ediacaranus new genus and species from the Ediacaran Dengying Formation in the Yangtze Gorges area of South China". Geological Magazine. 154 (6): 1257–1268. Bibcode:2017GeoM..154.1257S. doi:10.1017/S001675681700036X. S2CID 131980880.
- ^ Zhou, Chuanming; Xiao, Shuhai (2006). "Ediacaran .δ13C chemostratigraphy of South China". Chemical Geology. 237 (1–2): 89–108. doi:10.1016/j.chemgeo.2006.06.021.
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