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On the origin of hyolith helens
Skovsted, Christian B.1,2; Marti Mus, Monica3; Zhang, Zhiliang4; Pan, Bing (潘兵)5; Li, Luoyang1,2; Liu, Fan1,2; Li, Guoxiang (李国祥)5; Zhang, Zhifei2
2020-10-01
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume555Pages:11
Abstract

Helens, the curved lateral spines inserted between the conch and operculum of some hyoliths, are a unique morphological adaptation characterizing the order Hyolithida. These structures are paired, movable and had a mechanical function, probably related to orienting the hyolith conch and lifting its aperture above the sea floor. We show that helens are intimately associated with the hyolith opercula and are structurally comparable to the rod like units that constitute the clavicles, internal wall-like structures of the hyolithid operculum that probably evolved to secure the operculum from lateral displacement in the conch aperture. In some early Cambrian hyolith taxa that lack helens, such as Paramicrocornus, new clavicle rods are added in the gap separating the clavicles from the cardinal processes, the same position where helens are inserted in later hyolithids. We also show that the size of incipient helens at the earliest ontogenetic stage matches the size of the clavicles in associated opercula. We propose that helens are modified clavicle rods that were detached from the operculum and developed into lateral spines through allometric growth during early ontogeny. Further, we suggest a four-step model for the evolution of hyolithid hyoliths from orthothecid ancestors: 1, Externally fitting operculum; 2, Stabilizing, radially arranged structures on the inside of the operculum; 3, Ligula and folded operculum; 4, Detachment of clavicle rods and origin of helens.

KeywordHyolithida Orthothecida Operculum Clavicles Evolution Cambrian
DOI10.1016/j.palaeo.2020.109848
Indexed BySCI
Language英语
WOS KeywordSMALL SHELLY FOSSILS ; CAMBRIAN HYOLITHS ; SOUTH-AUSTRALIA ; MICROSTRUCTURES ; MORPHOLOGY ; MOUNTAINS ; FAUNA
Funding ProjectSwedish Research Council[VR2016-04610] ; Spanish Ministerio de Economia y Empresa (MINECO)[CGL2017-87631-P] ; National Natural Science Foundation of China[41890844] ; National Natural Science Foundation of China[41425008] ; National Natural Science Foundation of China[41621003] ; National Natural Science Foundation of China[41720104002] ; National Natural Science Foundation of China[41772002] ; Independent Innovation Project of graduate students of Northwest University[YZZ17196] ; Overseas Expertise Introduction Centre for Discipline Innovation [111 Center][D17013]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000552137900010
Funding OrganizationSwedish Research Council ; Spanish Ministerio de Economia y Empresa (MINECO) ; National Natural Science Foundation of China ; Independent Innovation Project of graduate students of Northwest University ; Overseas Expertise Introduction Centre for Discipline Innovation [111 Center]
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32128
Collection中国科学院南京地质古生物研究所
Corresponding AuthorSkovsted, Christian B.
Affiliation1.Swedish Museum Nat Hist, Dept Palaeobiol, Box 50007, SE-10405 Stockholm, Sweden
2.Northwest Univ, State Key Lab Continental Dynam & Dept Geol, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
3.Univ Extremadura, Area Paleontol, Ave Elvas S-N, Badajoz 06006, Spain
4.Macquarie Univ, Dept Biol Sci, Sydney, NSW 2109, Australia
5.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Skovsted, Christian B.,Marti Mus, Monica,Zhang, Zhiliang,et al. On the origin of hyolith helens[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,555:11.
APA Skovsted, Christian B..,Marti Mus, Monica.,Zhang, Zhiliang.,Pan, Bing .,Li, Luoyang.,...&Zhang, Zhifei.(2020).On the origin of hyolith helens.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,555,11.
MLA Skovsted, Christian B.,et al."On the origin of hyolith helens".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 555(2020):11.
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