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The oldest ionoscopiform from China sheds new light on the early evolution of halecomorph fishes.
MedLine Citation:
PMID:  24872460     Owner:  NLM     Status:  In-Data-Review    
The Halecomorphi are a major subdivision of the ray-finned fishes. Although living halecomorphs are represented solely by the freshwater bowfin, Amia calva, this clade has a rich fossil history, and the resolution of interrelationships among extinct members is central to the problem of understanding the origin of the Teleostei, the largest clade of extant vertebrates. The Ionoscopiformes are extinct marine halecomorphs that were inferred to have originated in the Late Jurassic of Europe, and subsequently dispersed to the Early Cretaceous of the New World. Here, we report the discovery of a new ionoscopiform, Robustichthys luopingensis gen. et sp. nov., based on eight well-preserved specimens from the Anisian (242-247 Ma), Middle Triassic marine deposits of Luoping, eastern Yunnan Province, China. The new species documents the oldest known ionoscopiform, extending the stratigraphic range of this group by approximately 90 Ma, and the geographical distribution of this group into the Middle Triassic of South China, a part of eastern Palaeotethys Ocean. These new data provide a minimum estimate for the split of Ionoscopiformes from its sister clade Amiiformes and shed new light on the origin of ionoscopiform fishes.
Guang-Hui Xu; Li-Jun Zhao; Michael I Coates
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biology letters     Volume:  10     ISSN:  1744-957X     ISO Abbreviation:  Biol. Lett.     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-05-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  -     Citation Subset:  IM    
Copyright Information:
© 2014 The Author(s) Published by the Royal Society. All rights reserved.
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