CALCISPONGES AND HYDROZOANS FROM PERMIAN REEFS IN WESTERN GUANGXI

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SummaryThepresentpaperdescribesbrieflysomegeneralfeaturesofthePermianreefsexposedinTianlin ,LingyunandFengshancounties,Guangxi,whereabundantframebuildingorganismsin cludingcalcisponges,hydrozoansandothersarewellpreserved .7generaofsphinctozoansponges,3generaofinozoansponges ,one“hydrozoan”genusandafewreceptaculitidsaredescribedhere .Thesphinctozoansincludethefollowinggenera :Stylothalamia ,Lichuanospongia ,Tebagathalamia ,Imbricatocoelia ,In trasporeocoelia ,RhabdactiniaandLingyunocoelia .TheinozoanspongesarePeronidella ,IntratubospongiaandCavusonella .ThehydrozoansarerepresentedonlybyonegenusRadiotrabecu loporaincluding 3species.Withintheseforms,Lingyunocoeliasphericaisestablishedhereasanew genusandanewspecies ,whileLichuanospongiaguangxiensisisregardedasanewspecies .AllofotherformsmentionedabovewerefoundusuallyinthePer mianreefsofSouthChina .Senowbari Daryan(1990 ) proposedthattheCystauletes,AscosymplegmaandLichunospongiashouldbesubstitutedbyearlierestablished genusDiscosiphonellaInai (1936 ) ,butLichuanospongiaisquitedifferentfromDiscosiphonellabasedongeneralshapes,outlinesofchambersandtheabsenceofvesiculartissueinthecentraltubes,thereforeLichuanospongiaisregardedstillasanindependentgenuswithinthesphinctozoans.ThenewgenusLingyunocoeliahassomecommonsimilaritieswithSollasiaandGirtyocoelia ,buttheabsenceofporesandtubesofvariouskindsonthewallsofsphericalchamberscannotbepermittedtoincludethepresentnewformintoeitheroftwogenera ,thereforeanewgenusisestablishedhereforthisform .InthispaperthegenusRadiotrabeculoporaisstillviewedasagenuswithinthehydrozoanclassratherthantheInozoanorderbecauseRadiotrabeculoporaischaracterizedbytheirratherregu lardistributionofradialtrabeculae .Thesetrabeculaecannotbeconsideredasfibresofinozoansponges,andthoseexhalanttubesareregardedhereascanalsbetweentwotrabeculae
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