Are palaeoscolecids ancestral ecdysozoans?

doi:10.1111/j.1525-142X.2010.00403.x

CORC > 北京大学 > 地球与空间科学学院

	Are palaeoscolecids ancestral ecdysozoans?
	Harvey, Thomas H. P. ; Dong, Xiping ; Donoghue, Philip C. J.
刊名	evolution development
	2010
关键词	HALICRYPTUS-SPINULOSUS PRIAPULIDA ELECTRON-MICROSCOPIC OBSERVATIONS HORSEHAIR WORMS NEMATOMORPHA FOSSIL RECORD PHYLOGENETIC SIGNIFICANCE CAUDATUS PRIAPULIDA CUTICULAR STRUCTURE PARAGORDIUS-VARIUS ANIMAL PHYLOGENY SOUTH-AUSTRALIA
DOI	10.1111/j.1525-142X.2010.00403.x
英文摘要	P>The reconstruction of ancestors is a central aim of comparative anatomy and evolutionary developmental biology, not least in attempts to understand the relationship between developmental and organismal evolution. Inferences based on living taxa can and should be tested against the fossil record, which provides an independent and direct view onto historical character combinations. Here, we consider the nature of the last common ancestor of living ecdysozoans through a detailed analysis of palaeoscolecids, an early and extinct group of introvert-bearing worms that have been proposed to be ancestral ecdysozoans. In a review of palaeoscolecid anatomy, including newly resolved details of the internal and external cuticle structure, we identify specific characters shared with various living nematoid and scalidophoran worms, but not with panarthropods. Considered within a formal cladistic context, these characters provide most overall support for a stem-priapulid affinity, meaning that palaeoscolecids are far-removed from the ecdysozoan ancestor. We conclude that previous interpretations in which palaeoscolecids occupy a deeper position in the ecdysozoan tree lack particular morphological support and rely instead on a paucity of preserved characters. This bears out a more general point that fossil taxa may appear plesiomorphic merely because they preserve only plesiomorphies, rather than the melange of primitive and derived characters anticipated of organisms properly allocated to a position deep within animal phylogeny.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000276024400007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Evolutionary Biology; Developmental Biology; Genetics & Heredity; SCI(E); 40; ARTICLE; 2; 177-200; 12
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/244353]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Harvey, Thomas H. P.,Dong, Xiping,Donoghue, Philip C. J.. Are palaeoscolecids ancestral ecdysozoans?[J]. evolution development,2010.
APA	Harvey, Thomas H. P.,Dong, Xiping,&Donoghue, Philip C. J..(2010).Are palaeoscolecids ancestral ecdysozoans?.evolution development.
MLA	Harvey, Thomas H. P.,et al."Are palaeoscolecids ancestral ecdysozoans?".evolution development (2010).