参考学习资料 生物学习 内华达早泥盆世新发现的梳甲鱼.pdf

Morphology,

Phylogenyand

Paleobiogeography

ofFossilFishes

HonoringMeemannChang

DavidK.Elliott,JohnG.Maisey,

XiaoboYuDesuiMiao(editors)

•

VerlagDr.FriedrichPfeilMünchen

Morphology,PhylogenyandPaleobiogeographyofFossilFishes

D.K.Elliott,J.G.Maisey,X.YuD.Miao(eds.):pp.25-38,3figs.,1tab.

©2010byVerlagDr.FriedrichPfeil,München,Germany–ISBN978-3-89937-122-2

Anewctenaspid(Agnatha,Heterostraci)

fromtheEarlyDevonianofNevada,

withcommentsontaxonomy,paleobiology

andpaleobiogeography

DavidK.ElliottandAlainR.M.Blieck

Abstract

Zaphoctenaspismeemannaen.gen.etsp.isdescribedfromtheLowerDevonianSevyFormationofeasternNevada.

ThesixpreviouslydescribedspeciesofctenaspidscomefromtheCanadianArctic,Spitsbergen,andPodolia,

andCtenaspisisalsoreportedfromSevernayaZemlya.ThePodolianandSpitsbergenspecies,hereconsidered

tocomprisethegenusCtenaspis,areseparatedfromtheCanadianarcticspecies,whichconstitutethenewgenus

Arctictenaspisandthectenaspidsareraisedtofamilyrank.Theknownspecieshaveacircum-Arcticdistribution

andthenewspeciesthereforeconstitutesaconsiderableextensioningeographicrange.Asallthepreviously

describedspeciesaredatedtothemiddleorlateLochkovianandZ.meemannaen.gen.etsp.isEmsianinage

thereisalsoaconsiderableincreaseinthetemporalrange.ConsiderationofEarlyDevonianpaleogeography

suggeststhatdispersaltookplacethroughproximalmarineenvironmentsaroundtheOldRedSandstone

continentbuttherelativepaucityofdatamake