A new tooth-plated lungfish from the Middle Devonian of Yunnan, China, and its phylogenetic relationships

Autor:	Tuo Qiao, Min Zhu
Rok vydání:	2009
Předmět:	Sarcopterygii Lungfish biology Zoology Cell Biology biology.organism_classification Devonian Diabolepis Paleontology Monophyly Sister group Dipnorhynchus Animal Science and Zoology Ecology Evolution Behavior and Systematics Dipterus
Zdroj:	Acta Zoologica. 90:236-252
ISSN:	1463-6395 0001-7272
DOI:	10.1111/j.1463-6395.2008.00381.x
Popis:	Qiao, T. and Zhu, M. 2009. A new tooth-plated lungfish from the Middle Devonian of Yunnan, China, and its phylogenetic relationships. — Acta Zoologica (Stockholm) 90 (Suppl. 1): 236‐252 A new genus and species of tooth-plated lungfish, Sinodipterus beibei gen. et sp. nov., is described from the Qujing Formation (Middle Devonian, late Eifelian) of Zhaotong, Yunnan, China. The new form resembles Dipterus in the skull table, but differs in its tooth-plate: cosmine-like tissue absent near the midline, tooth rows fewer in number (7 to 8) and less divergent radiating, and no reparative dentine layers. Phylogenetic analysis of Devonian lungfish based on a dataset of 150 characters and 33 taxa indicates that the new taxon is more crownward than Dipterus and the clade comprising Adololopas , Sorbitorhynchus and Pillararhynchus . Our results agree broadly with previous cladistic solutions. Diabolepis is placed as a sister group to all other Devonian lungfish. The species referred to Chirodipterus fail to form a monophyletic group. The result shows a large number of convergences corresponding to early radiation of lungfish compressed in time.
Databáze:	OpenAIRE
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