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| '''''Changchengia''''' is a genus of possible ] from the early-mid ]. It contains one species, '''''C. stipitata'''''. This genus is known from various formations, such as the Olive Shales of the ]<ref name=vindhya>{{cite journal |last1=Sharma |first1=Mukund |title=Late Palaeoproterozoic (Statherian) carbonaceous films from the Olive Shale (Koldaha Shale), Semri Group, Vindhyan Supergroup, India |journal=Journal of the Palaeontological Society of India |date=December 2006 |volume=51 |issue=2 |pages=27–35 |url=http://palaeontologicalsociety.in/vol51_2/v2.pdf}}</ref> and the Saraipali Formation in India,<ref name=singhora>{{cite journal |last1=Babu |first1=Rupendra |last2=Singh |first2=Veeru Kant |title=Record of aquatic carbonaceous metaphytic remains from the Proterozoic Singhora Group of Chhattisgarh Supergroup, India and their significance |journal=Journal of Evolutionary Biology Research |date=July 2011 |volume=3 |issue=5 |pages=47-66 |url=https://www.researchgate.net/publication/239337503_Record_of_aquatic_carbonaceous_metaphytic_remains_from_the_Proterozoic_Singhora_Group_of_Chhattisgarh_Supergroup_India_and_their_significance |language=english}}</ref> alongside the ] of China.<ref>{{cite journal |last1=Liu |first1=Jingqi |last2=Zhang |first2=Yang |last3=Shi |first3=Xiaoying |last4=Chen |first4=Anfeng |last5=Tang |first5=Dongjie |last6=Yang |first6=Tinglu |title=Macroscopic fossils from the Chuanlinggou Formation of North China: evidence for an earlier origin of multicellular algae in the late Palaeoproterozoic |journal=Palaeontology |date=November 2023 |volume=66 |issue=6 |doi=10.1111/pala.12685}}</ref> | '''''Changchengia''''' is a genus of possible ] from the early-mid ]. It contains one species, '''''C. stipitata'''''. This genus is known from various formations, such as the Olive Shales of the ]<ref name=vindhya>{{cite journal |last1=Sharma |first1=Mukund |title=Late Palaeoproterozoic (Statherian) carbonaceous films from the Olive Shale (Koldaha Shale), Semri Group, Vindhyan Supergroup, India |journal=Journal of the Palaeontological Society of India |date=December 2006 |volume=51 |issue=2 |pages=27–35 |url=http://palaeontologicalsociety.in/vol51_2/v2.pdf}}</ref> and the Saraipali Formation in India,<ref name=singhora>{{cite journal |last1=Babu |first1=Rupendra |last2=Singh |first2=Veeru Kant |title=Record of aquatic carbonaceous metaphytic remains from the Proterozoic Singhora Group of Chhattisgarh Supergroup, India and their significance |journal=Journal of Evolutionary Biology Research |date=July 2011 |volume=3 |issue=5 |pages=47-66 |url=https://www.researchgate.net/publication/239337503_Record_of_aquatic_carbonaceous_metaphytic_remains_from_the_Proterozoic_Singhora_Group_of_Chhattisgarh_Supergroup_India_and_their_significance |language=english}}</ref> alongside the ] of China.<ref>{{cite journal |last1=Liu |first1=Jingqi |last2=Zhang |first2=Yang |last3=Shi |first3=Xiaoying |last4=Chen |first4=Anfeng |last5=Tang |first5=Dongjie |last6=Yang |first6=Tinglu |title=Macroscopic fossils from the Chuanlinggou Formation of North China: evidence for an earlier origin of multicellular algae in the late Palaeoproterozoic |journal=Palaeontology |date=November 2023 |volume=66 |issue=6 |doi=10.1111/pala.12685}}</ref> | ||
| == Description == | == Description == | ||
| ''Changchengia'' is between 0.7 and 40 millimetres long and between 0.5 to 4 mm wide, with a thin blade-like ]. In ''C. stipitata'' the thallus is usually ribbon-shaped or ] with folded and ] margins, with the widest point in the middle and tapering towards the base and tip. However, fossils from the Chuanlinggou Formation are more ovoid or ] in shape, alongside tapering holdfasts. The base is obtuse and contacts with a long and linear parastem, which itself connects to a holdfast. This genus shares many morphological similarities with '']'', and infact it was classified within this genus at first.<ref name=singhora/> However, a conspicuous difference between the two is that ''Tuanshanzia'' has no parastem, and instead its thallus slowly narrows towards the holdfast. | ''Changchengia'' is between 0.7 and 40 millimetres long and between 0.5 to 4 mm wide, with a thin blade-like ]. In ''C. stipitata'' the thallus is usually ribbon-shaped or ] with folded and ] margins, with the widest point in the middle and tapering towards the base and tip. However, fossils from the Chuanlinggou Formation are more ovoid or ] in shape, alongside tapering holdfasts. The base is obtuse and contacts with a long and linear parastem, which itself connects to a holdfast. This genus shares many morphological similarities with '']'', and infact it was classified within this genus at first.<ref name=singhora/> However, a conspicuous difference between the two is that ''Tuanshanzia'' has no parastem, and instead its thallus slowly narrows towards the holdfast. | ||
| {{multiple image | |||
| | total_width = 400 | |||
| | image1 = Changchengia sp 1.png | |||
| | alt1 = Changchengia sp. | |||
| | image2 = Changchengia sp. 2.png | |||
| | alt2 = Changchengia sp. | |||
| | image3 = Changchengia sp 3.png | |||
| | alt3 = Changchengia sp. | |||
| | footer = Reconstructions of 3 different forms of ''Changchengia'' sp. from the Chuanlinggou Formation. | |||
| }} | |||
| == References == | == References == | ||
Revision as of 20:13, 26 December 2024
Genus of problematic fossil
| Changchengia Temporal range: Statherian–Calymmian Pha. Proterozoic Archean Had. | |
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Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | incertae sedis |
| Genus: | †Changchengia Yan & Liu, 1997 |
| Species: | †C. stipitata |
| Binomial name | |
| †Changchengia stipitata Yan and Liu, 1997 | |
Changchengia is a genus of possible alga from the early-mid Proterozoic. It contains one species, C. stipitata. This genus is known from various formations, such as the Olive Shales of the Vindhya Range and the Saraipali Formation in India, alongside the Chuanlinggou Formation of China.
Description
Changchengia is between 0.7 and 40 millimetres long and between 0.5 to 4 mm wide, with a thin blade-like thallus. In C. stipitata the thallus is usually ribbon-shaped or lanceolate with folded and lamellose margins, with the widest point in the middle and tapering towards the base and tip. However, fossils from the Chuanlinggou Formation are more ovoid or obcordate in shape, alongside tapering holdfasts. The base is obtuse and contacts with a long and linear parastem, which itself connects to a holdfast. This genus shares many morphological similarities with Tuanshanzia, and infact it was classified within this genus at first. However, a conspicuous difference between the two is that Tuanshanzia has no parastem, and instead its thallus slowly narrows towards the holdfast.
Reconstructions of 3 different forms of Changchengia sp. from the Chuanlinggou Formation.
References
- Sharma, Mukund (December 2006). "Late Palaeoproterozoic (Statherian) carbonaceous films from the Olive Shale (Koldaha Shale), Semri Group, Vindhyan Supergroup, India" (PDF). Journal of the Palaeontological Society of India. 51 (2): 27–35.
- ^ Babu, Rupendra; Singh, Veeru Kant (July 2011). "Record of aquatic carbonaceous metaphytic remains from the Proterozoic Singhora Group of Chhattisgarh Supergroup, India and their significance". Journal of Evolutionary Biology Research. 3 (5): 47–66.
- Liu, Jingqi; Zhang, Yang; Shi, Xiaoying; Chen, Anfeng; Tang, Dongjie; Yang, Tinglu (November 2023). "Macroscopic fossils from the Chuanlinggou Formation of North China: evidence for an earlier origin of multicellular algae in the late Palaeoproterozoic". Palaeontology. 66 (6). doi:10.1111/pala.12685.
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