NIGPAS OpenIR
Olivooides-like tube aperture in early Cambrian carinachitids (Medusozoa, Cnidaria)
Han, Jian1,2; Li, Guoxiang (李国祥)3; Wang, Xing1,2; Yang, Xiaoguang1,2; Guo, Junfeng4; Sasaki, Osamu5; Komiya, Tsuyoshi6
2018
Source PublicationJOURNAL OF PALEONTOLOGY
ISSN0022-3360
Volume92Issue:1Pages:3-13
Abstract

The early Cambrian Carinachitidae, a family in the subclass Conulata, are intriguing and important small shelly fossils. Their gently tapering, tube-shaped skeletons consist of convex faces separated from each other by broad, deep corner sulci, and they exhibit triradial, pentaradial, or predominantly tetraradial symmetry. However, the morphology of the aperture and the modes of growth of carinachitid skeletons as well as the anatomy of their soft parts are unknown. Examination of a single new, exceptionally well-preserved specimen of tetramerous Carinachites spinatus Qian, 1977, collected from the lower Cambrian Kuanchuanpu Formation in South China, reveals: (1) that its aperture is connected to a small mass of relic soft tissue and (2) that the apertural end of each of the four faces is developed into a subtriangular lappet or oral lobe that is smoothly folded toward the long axis of the tube, partially closing the tube aperture. Similarities between thorn-like spines on the faces and the oral lobes indicate that the transverse ribs were periodically displaced from the perradial portion of the aperture during formation of new ribs. In addition, the tube walls may have undergone secondary thickening during growth. The growth pattern of the tube and the spatial relationships between the tube aperture and soft parts are analogous to those of co-occurring olivooids. These findings further strengthen the previously proposed hypothesis that coeval carinachitids, olivooids, hexangulaconulariids, and Paleozoic conulariids are closely related taxa within the subphylum Medusozoa. Finally, carinachitids most likely represent an evolutionary intermediate between olivooids and hexangulaconulariids.

DOI10.1017/jpa.2017.10
Language英语
WOS KeywordYangtze Platform China ; Small Shelly Fossils ; South China ; Phylogenetic Significance ; Phylum-cnidaria ; Conulariid Test ; Evolution ; Scyphozoa ; Microstructure ; Microanatomy
Funding ProjectNatural Science Foundation of China (NSFC grant)[41272019] ; Natural Science Foundation of China (NSFC grant)[41621003] ; Natural Science Foundation of China (NSFC grant)[41372021] ; Natural Science Foundation of China (NSFC grant)[41472015] ; '973 project' of the Ministry of Science and Technology of China[2013CB835002] ; '973 project' of the Ministry of Science and Technology of China[2013CB837100] ; Chinese Academy of Sciences[XDB10010101] ; State Key Laboratory of Palaeobiology and Stratigraphy[163107]
WOS Research AreaPaleontology
WOS SubjectPaleontology
WOS IDWOS:000425398500002
Funding OrganizationNatural Science Foundation of China (NSFC grant) ; '973 project' of the Ministry of Science and Technology of China ; Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy
PublisherCAMBRIDGE UNIV PRESS
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/18840
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorHan, Jian
Affiliation1.Northwest Univ Xian, Dept Geol, 229 Taibai Rd, Xian 710069, Shaanxi, Peoples R China
2.Northwest Univ Xian, State Key Lab Continental Dynam, 229 Taibai Rd, Xian 710069, Shaanxi, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
4.Changan Univ, Sch Earth Sci & Land Resources, Key Lab Western Chinas Mineral Resources & Geol E, Minist Educ, Xian 710054, Shaanxi, Peoples R China
5.Tohoku Univ, Tohoku Univ Museum, Aoba Ku, 6-3 Aoba, Sendai, Miyagi, Japan
6.Univ Tokyo, Grad Sch Arts & Sci, Dept Earth Sci & Astron, Tokyo 1538902, Japan
Recommended Citation
GB/T 7714
Han, Jian,Li, Guoxiang ,Wang, Xing,et al. Olivooides-like tube aperture in early Cambrian carinachitids (Medusozoa, Cnidaria)[J]. JOURNAL OF PALEONTOLOGY,2018,92(1):3-13.
APA Han, Jian.,Li, Guoxiang .,Wang, Xing.,Yang, Xiaoguang.,Guo, Junfeng.,...&Komiya, Tsuyoshi.(2018).Olivooides-like tube aperture in early Cambrian carinachitids (Medusozoa, Cnidaria).JOURNAL OF PALEONTOLOGY,92(1),3-13.
MLA Han, Jian,et al."Olivooides-like tube aperture in early Cambrian carinachitids (Medusozoa, Cnidaria)".JOURNAL OF PALEONTOLOGY 92.1(2018):3-13.
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