NDLI: A paleontological perspective of vertebrate origin

Content Provider	Springer Nature Link
Author	Shu, Degan
Copyright Year	2003
Abstract	The Early CambrianHaikouichthys and Haikouella have been claimed to be related to contribute in an important way to our understanding of vertebrate origin, but there have been heated debates about how exactly they are to be interpreted. New discoveries of numerous specimens ofHaikouichthys not only confirm the identity of previously described structures such as the dorsal and the ventral fins, and chevron-shaped myomeres, but also reveal many new important characteristics, including sensory organs of the head (e.g. large eyes), and a prominent notochord with differentiated vertebral elements. This “first fish” appears, however, to retain primitive reproductive features of acraniates, suggesting that it is a stem-group craniates. A. new order (Myllokunmingiida) and a new family (Myllokunmingiidae) are erected, and a new species,Zhongjianichthys rostratus (gen. et sp. nov.), is described herein. Over 1400 newlydiscovered specimens ofHaikouella provide a wealth of anatomical information on this organism. It differs from chordates in many organs and organ systems, including the skin, muscles, respiratory, circulatory and nervous systems. In contrast, its body-design resembles that of vetulicolians, and the presence of a “transitional” nervous system with both dorsal and ventral nerve cords suggests an affinity with living hemichordates. On the basis of these and other recent findings of fossil deuterostomes, a five-step hypothesis for vertebrate origin is proposed, intended to bridge the longstanding gap between protostomes and vertebrates. Four of the five steps accord with established ideas current in modern evolutionary zoology. Evidence for the first step is obtainable only from fossils, and specifically from fossils found from South China, hence the crucial importance of S. China sites for our understanding of early vertebrate origins and evolution. Accordingly, South China is suggested as the oldest-known birthplace of the whole vertebrates.
Starting Page	725
Ending Page	735
Page Count	11
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	48
Issue Number	8
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2003-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	primitive vertebrateHaikouichthys non-chordateHaikouella Early Cambrian Chengjiang Lagerstatte origin of vertebrates deuterostome evolution Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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