Chuandianella
| Chuandianella ovata Temporal range:
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|---|---|
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| Reconstruction | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| (unranked): | Tactopoda |
| Phylum: | Arthropoda |
| Class: | incertae sedis |
| Genus: | †Chuandianella Hou and Bergström, 1991 |
| Species: | †C. ovata
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| Binomial name | |
| †Chuandianella ovata (Li, 1975)
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| Synonyms[1] | |
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Chuandianella ovata is an extinct shrimp-like arthropod with unknown affinity that lived during the Atdabanian Age of the Early Cambrian (about 520 to 516 million years ago). It is the only species classified under the genus Chuandianella. Its fossils were recovered from the Chengjiang Lagerstätte of the Maotianshan Shales in China.[2] Its carapace was made up of calcium phosphate.[3]
It was originally described in 1975 under the "ostracod"-like genus Mononotella, as Mononotella ovata. In 1991, the paleontologists Xian-Guang Hou and Jan Bergström reclassified it under the new genus Chuandianella when additional discoveries of more complete specimens made its resemblance to Waptia fieldensis more apparent. Like W. fieldensis, Chuandianella ovata had a bivalved carapace with a median ridge, a pair of caudal rami, a single pair of antennae, and stalked eyes. In 2004, paleontologist Jun-Yuan Chen tentatively transferred it to the genus Waptia. However, C. ovata had eight abdominal somites in contrast to five in W. fieldensis. Its limbs were biramous and were undifferentiated, unlike those of W. fieldensis.[4] Other authors deemed these differences to be enough to separate it from Waptia to its own genus.[5][6]
In 2022, Chuandianella was rejected from Hymenocarina, the group includes Waptia, because of subequal limbs and absence of mandibles, and was instead considered an "upper stem-group arthropod" as opposed to the more derived euarthropod hymenocarines.[7]
It has been suggested that it was a filter feeder, using its feathery endopod endites to capture small food particles from the water column.[7]
See also
References
- ^ "Chuandianella ovata". Paleobiology Database. Retrieved February 16, 2012.
- ^ "Chuandianella". Paleobiology Database. Retrieved February 16, 2012.
- ^ Liu, Cong; Fu, Dongjing; Zhang, Xingliang (2021). Álvaro, Javier (ed.). "Phosphatic carapace of the waptiid arthropod Chuandianella ovata and biomineralization of ecdysozoans". Palaeontology. 64 (6): 755–763. doi:10.1111/pala.12570. ISSN 0031-0239.
- ^ Rod S. Taylor (2002). "A new bivalved arthropod from the Early Cambrian Sirius Passet fauna, North Greenland". Palaeontology. 45 (Part 1): 97–123. doi:10.1111/1475-4983.00229.
- ^ "Waptia fieldensis". Royal Ontario Museum. 2011. Retrieved January 14, 2012.
- ^ Hu-Qin Liu & De-Gan Shu (2004). "澄江化石库中川滇虫属化石的新信息" [New information on Chuandianella from the Lower Cambrian Chengjiang Fauna, Yunnan, China]. Journal of Northwest University (Natural Science Edition) (in Chinese). 34 (4): 453–456.
- ^ a b Zhai, Dayou; Williams, Mark; Siveter, David J.; Siveter, Derek J.; Harvey, Thomas H. P.; Sansom, Robert S.; Mai, Huijuan; Zhou, Runqing; Hou, Xianguang (2022-02-22). "Chuandianella ovata: An early Cambrian stem euarthropod with feather-like appendages". Palaeontologia Electronica. 25 (1): 1–22. doi:10.26879/1172. ISSN 1094-8074.