Scales and Dermal Skeletal Histology of an Early Bony Fish Psarolepis romeri and Their Bearing on the Evolution of Rhombic Scales and Hard Tissues

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	Scales and Dermal Skeletal Histology of an Early Bony Fish Psarolepis romeri and Their Bearing on the Evolution of Rhombic Scales and Hard Tissues
	Qu, Qingming 1,2; Zhu, Min 2; Wang, Wei 2
	2013-04-09
发表期刊	PLOS ONE
卷号	8 期号:4
文章类型	Article
摘要	Recent discoveries of early bony fishes from the Silurian and earliest Devonian of South China (e. g. Psarolepis, Achoania, Meemannia, Styloichthys and Guiyu) have been crucial in understanding the origin and early diversification of the osteichthyans (bony fishes and tetrapods). All these early fishes, except Guiyu, have their dermal skeletal surface punctured by relatively large pore openings. However, among these early fishes little is known about scale morphology and dermal skeletal histology. Here we report new data about the scales and dermal skeletal histology of Psarolepis romeri, a taxon with important implications for studying the phylogeny of early gnathostomes and early osteichthyans. Seven subtypes of rhombic scales with similar histological composition and surface sculpture are referred to Psarolepis romeri. They are generally thick and show a faint antero-dorsal process and a broad peg-and-socket structure. In contrast to previously reported rhombic scales of osteichthyans, these scales bear a neck between crown and base as in acanthodian scales. Histologically, the crown is composed of several generations of odontodes and an irregular canal system connecting cylindrical pore cavities. Younger odontodes are deposited on older ones both superpositionally and areally. The bony tissues forming the keel of the scale are shown to be lamellar bone with plywood-like structure, whereas the other parts of the base are composed of pseudo-lamellar bone with parallel collagen fibers. The unique tissue combination in the keel (i.e., extrinsic Sharpey's fibers orthogonal to the intrinsic orthogonal sets of collagen fibers) has rarely been reported in the keel of other rhombic scales. The new data provide insights into the early evolution of rhombic (ganoid and cosmoid) scales in osteichthyans, and add to our knowledge of hard tissues of early vertebrates.
WOS标题词	Science & Technology
关键词[WOS]	LOWER-VERTEBRATES ; ORIGIN ; FOSSIL ; INTERRELATIONSHIPS ; OSTEICHTHYANS ; POROLEPIFORM ; CHARACTERS ; PHYLOGENY ; ANATOMY ; COSMINE
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000317909600117
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/7332
专题	古低等脊椎动物研究室
作者单位	1.Uppsala Univ, Evolutionary Biol Ctr, Dept Organismal Biol, Subdept Evolut & Dev, Uppsala, Sweden 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Qu, Qingming,Zhu, Min,Wang, Wei. Scales and Dermal Skeletal Histology of an Early Bony Fish Psarolepis romeri and Their Bearing on the Evolution of Rhombic Scales and Hard Tissues[J]. PLOS ONE,2013,8(4).
APA	Qu, Qingming,Zhu, Min,&Wang, Wei.(2013).Scales and Dermal Skeletal Histology of an Early Bony Fish Psarolepis romeri and Their Bearing on the Evolution of Rhombic Scales and Hard Tissues.PLOS ONE,8(4).
MLA	Qu, Qingming,et al."Scales and Dermal Skeletal Histology of an Early Bony Fish Psarolepis romeri and Their Bearing on the Evolution of Rhombic Scales and Hard Tissues".PLOS ONE 8.4(2013).