A Silurian placoderm with osteichthyan-like marginal jaw bones

被引：229

作者：

Zhu, Min ^{[1
]}

Yu, Xiaobo ^{[1
,2
]}

Ahlberg, Per Erik ^{[3
]}

Choo, Brian ^{[1
]}

Lu, Jing ^{[1
]}

Qiao, Tuo ^{[1
]}

Qu, Qingming ^{[3
]}

Zhao, Wenjin ^{[1
]}

Jia, Liantao ^{[1
]}

Blom, Henning ^{[3
]}

Zhu, You'an ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China

[2] Kean Univ, Dept Biol Sci, Union, NJ 07083 USA

[3] Uppsala Univ, Dept Organismal Biol, Evolutionary Biol Ctr, Subdept Evolut & Dev, S-75236 Uppsala, Sweden

来源：

NATURE | 2013年 / 502卷 / 7470期

基金：

中国国家自然科学基金;

关键词：

FISHES; PTYCTODONTIDA; INFORMATION; INFERENCE; MRBAYES; ORIGIN;

D O I：

10.1038/nature12617

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The gnathostome (jawed vertebrate) crown group comprises two extant clades with contrasting character complements. Notably, Chondrichthyes (cartilaginous fish) lack the large dermal bones that characterize Osteichthyes (bony fish and tetrapods). The polarities of these differences, and the morphology of the last common ancestor of crown gnathostomes, are the subject of continuing debate. Here we describe a three-dimensionally preserved 419-million-year-old placoderm fish from the Silurian of China that represents the first stem gnathostome with dermal marginal jaw bones (premaxilla, maxilla and dentary), features previously restricted to Osteichthyes. A phylogenetic analysis places the new form near the top of the gnathostome stem group but does not fully resolve its relationships to other placoderms. The analysis also assigns all acanthodians to the chondrichthyan stem group. These results suggest that the last common ancestor of Chondrichthyes and Osteichthyes had a macromeric dermal skeleton, and provide a new framework for studying crown gnathostome divergence.

引用

页码：188 / +

页数：7

共 40 条

[1]

[Anonymous], 1971, PALAEOZOIC FISHES

[2]

[Anonymous], MESQUITE MODULAR SYS

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