Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonic Mollusca, 231 . A new pteropod, Tibiella watupuruensis spec. nov. (Thecosomata, Creseidae), from Eocene (early Bartonian) rocks of the Nanggulan Formation, Java (Indonesia)

2013·3.4 MB·English

by  Janssen, Arie W

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Notes on the systematics, morphology and biostratigraphy
1
of fossil holoplanktonic Mollusca, 23 .
A new pteropod, Tibiella watupuruensis spec. nov.
(Thecosomata, Creseidae), from Eocene (early Bartonian)
rocks of the Nanggulan Formation, Java (Indonesia)
Arie W. Janssen
NaturalisBiodiversityCenter(PalaeontologyDepartment),P.O.Box9517,NL2300RALeiden,TheNetherlands;currently:12,Triqtal’Hamrija,Xewkija
XWK9033,Gozo,Malta;[email protected]
Willem Renema
NaturalisBiodiversityCenter (PalaeontologyDepartment),P.O.Box9517,NL2300RALeiden,TheNetherlands;[email protected]
13
Frank P. Wesselingh
NaturalisBiodiversityCenter (PalaeontologyDepartment),P.O.Box9517,NL2300RALeiden,TheNetherlands;[email protected].
Watupuru,Nanggulan,nearYogyakarta(Java,Indonesia),
ThepteropodspeciesTibiellawatupuruensisspec.nov., coordinates07°43’51.7”S,110°11’45”E).Atthetimeofcol-
closelyrelatedtoT.texanaCollins,1934,hithertoexclusively lecting(August2006)waterlevelintheriverwasextremely
knownfromtheEocene(Lutetian)ofthesouthernUnited lowandanalmostcompletesectionoftheNanggulanFor-
States,isintroducedfromtheEocene(Bartonian)ofthe mationwasexposed,startingwiththeligniteatthebase.We
NanggulanFormation,Java,Indonesia. stoppedsamplingattheDiscocyclinabeds,comparablewith
the‘middleunit‘ofLelono(2000),andKaliSonggoMember
Keywords:Gastropoda,Thecosomata,Creseidae,systematics,new ofKadar(1986).Thelithologyisdominatedbyalternations
species,Eocene. ofcalcareoussandstone,siltstoneandmudstonein0.4-1.2m
thickbeds,withsomecoarse-grainedsandstoneintercala-
tionsatthebaseofthesection.Macrofossils,includingmol-
Introduction luscs(e.g.Martin,1914,1931),largebenthicforaminifera
(byW.RenemaandF.P.Wesselingh) (Martin,1880)andcoralsoccurinlowabundancesoverthe
entiresection.TheNanggulanFormationisinterpretedasa
Thepteropodsdiscussedinthepresentpaperwerecollected transgressivesequence,passingfromacoastalplainupward
fromasievingresidueofrocksexposedalongtheKali throughshallowmarineintodeepmarine(Lelono,2000).
1Fornr22inthisseriesseeBasteria76:15. Basteria77(1-3):13-16(2013)
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Materialandage
(byW.RenemaandF.P.Wesselingh)
TheNanggulanFormationismiddle-lateEoceneinage.Our
sample06KW04Bwastakenfromtheintervalcorresponding
withtheupperpartoftheKaliWatupurusectionmeasured
byLelono(2000).Thatauthorinterpretedthispartofthe
sectionasaroundthemiddle-lateEoceneboundary.Plank-
tonicforaminiferaindicatethattheentireKaliWatupuru
sectioncorrelateswithP12-14(P.Lunt,pers.com.)(c.38-43
Ma),approximatelyequivalentwithtopNN16-lowerNN17
ofthenannoplanktonbiozonation.Theabundantoccurrence
oflargeDiscocyclinaisassociatedwiththeTa-Tbtransition,
correlatedwiththemiddleBartonian(Lunt&Allan,2004;
Renema,2007).Thisdatumplaneisfoundabovethesample
underinvestigation.Inconclusion,theageofthesamplein-
vestigatedhereisearlyBartonian(roughlyc.38-40Ma).
Samplesarehousedinthefossilholoplanktonicmollusc
collectionoftheNaturalisBiodiversityCenter,Leiden,The
Netherlands(RGMregistrationnumbers).
14 Systematics
(byA.W.Janssen)
CladeThecosomatadeBlainville,1824
SuperfamilyCavolinioideaGray,1850?
FamilyCreseidaeRampal,1973
Note.–Creseidaehavetraditionallybeenincludedinthesu-
perfamilyCavolinioidea,butrecentmolecularwork(Jennings
etal.,2010)hasdemonstratedacloserelationshipbetween
someCreseidaeandLimacinidae,whichledBouchet(2012)to
includetheCreseidaeintheLimacinoideaintheWoRMSweb-
site.Althoughsurprisingatfirstglancebecauseoflargediffer-
Fig.1.LocationoftheKaliWatupurusection,Java,Indonesia. encesinshellmorphology(sinistralspiralinLimacinidaeand
conicaltobilaterallysymmetricalinCreseidae)therearealso
indicationsforthisdevelopment fromthefossilrecordbya
Theintervalsampledherereachesfromcoastaltosome100 gradualdespiralisationoflimacinidspeciesleadingtocreseids
mwaterdepth,basedontheoccurrenceofthesymbiont duringtheEocene(Janssen&Peijnenburg,inpress,fig.8).
bearingforaminiferNummulitesdjokdjokartae(Martin,1881)
inthelowerpartofthesection,andabundantoccurrenceof TibiellaMeyer,1884
largeDiscocyclinaspec.atthetop. Typespecies:TibiellamarshiMeyer,1884(bymonotypy)(Eocene).
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TibiellawatupuruensisJanssenspec.nov.(Fig.2a-b)
Typematerial.–Holotype;RGM776834(Fig.2a-b).
Paratypesfromthetypelocality;RGM776835/7;RGM776
836/4;RGM776837/1.
Typelocality.–SampleO6KW04B,outcropalongthe
KaliWatupuru,Nanggulan,nearYogyakarta,Java(Indone-
sia),coordinates07°43’51.7”S,110°11’45”E.
Stratumtypicum.–NanggulanFormation,upperpartof
KaliSonggoMember(Eocene,earlyBartonian;Planktonic
ForaminiferaZoneP12-14).
Etymology.–Thenewspeciesisnamedafterthetype Figs2,3.Tibiellaspecies.2a-b,Tibiellawatupuruensisspec.nov.,holo-
locality. type;a.frontal,b.rightlateralviews.RGM776834(cameralucida
Description.–Theshell(holotype:H=2.16,W=0.88mm) drawings).Bar1mm.3,OriginalillustrationsoftheholotypeofTibiella
istubiform,veryslightlycurveddorso-ventrally,withacircu- texanaCollins,1934(afterCollins,1934:pl.14figs2-5).1mmbaradded.
lartransversesectionalloveritsheight.Atmidheightthe
shellisinflated,somewhatstrongersoatitsventralside(lat-
eralview).Theadapicalshellpartisregularlyconicaland somewhatmoreswollenventralside(lateralview,Fig.1b),
abruptlytruncatedbysheddingofanasyetunknownlarval withamoreconicaladapicalshellpartandthereforeasep-
shell.Theopeningisclosedbyafaintlyconvexseptum,dam- tumwithrelativelymuchsmallerdiameter.Themore
agedinallavailablespecimens.Theshellsurfaceissmooth, obliquelypositionedaperturalflangeisnotsharp,asinthe
somespecimensareabitshinyandintheseveryfinegrowth holotypeandadditionalspecimensofT.texanafromTexas, 15
linesarevisibleatthoseplaceswherethelightreflectsonthe butperfectlyroundedandmassive,coincidingwiththeactual
shell’ssurface.Theapertureisreinforcedbyasolidflange,co- aperturalmargin,whereasinmostoftheAmericanspeci-
incidingwiththeactualaperturalmargin,circularinadapical menstheflangeissituatedcloselybelowthemargin.
view,situatedatanobliqeanglewithrespecttotheshell’s AswasalreadysuggestedbyMeyer(1884:110)forTi-
longaxisandinthatwayamplifyingaslightdorso-ventral biellamarshiMeyer,1884,Collins(1934)comparedTibiella
curvature,itshighersideinterpretedasdorsal. texanawithRecentcuvierinids,namelyCuvierinacolumnella
Discussion.–Thepresentnewspecieswastheonlyholo- (Rang,1827)asalsointhatspeciesthelarvalshellisshed
planktonicmolluscspeciesfoundinthesample.Itshowsa andtheresultinggapisclosedwithaseptum.Thiswassub-
strikingresemblancewithaspeciesdescribedfromthemid- sequentlyacceptedbyHodgkinsonetal.(1992),whoin-
dleEocene(Lutetian,WechesFormation,NP15a)ofthe cludedthegenusTibiella,togetherwithBucanoides
southernUnitedStates,viz.TibiellatexanaCollins(1934:227, Hodgkinson,inHodgkinsonetal.,1992,andLoxobidens
pl.14figs2-5,as‘Tibiella‘texana)(Fig.3).Thereare,however, Hodgkinson,inHodgkinsonetal.,1992,inthesubfamily
someapparentdifferencesbetweentheIndonesianspeci- Cuvierininae.Janssen(2005:28),however,transferredthese
menswhencomparedtotheonesfromTexas,asdescribed generatotheCreseidaeinwhichgroupearlyshellshedding
andillustratedbyCollinsandsubsequentlybyHodgkinson andsubsequentclosurewithaseptumarealsoknown(Eu-
etal.(1992:35,pl.13,figs4-8). chilotheca)andinwhichaperturalflangesoccurfrequently,
TheIndonesianspecimensreachhardlyhalftheshell whereastheseareunknownamongtheCuvierinidae.
height(holotype=2.16mm)oftheAmericanshells(holotype OtherspeciesofTibiellaarealso,andsofarexclusively,
ofT.texana,H=4.5mm,Collins,1934;topotypeH=3.9mm, describedfromthesouthernUnitedStates.Tibiellaannulata
Hodgkinsonetal.,1992).Theyarelessslenderbecauseofa Garvie,inHodgkinsonetal.,1992,fromtheViescaMember,
A.W. Janssen, W.Renema & F.P. Wesselingh–TibiellawatupuruensisfromJava
B76-2012-21:Basteria-2010 14/09/2013 12:40 Page 16
WechesFormation,Texas,isalsoofLutetianage.Tibiella NorthAmerica.–BulletinsofAmericanPaleontology103(341):5-62.
marshiMeyer,1884,wasintroducedfromtheBartonian Janssen,A.W.,2005.DevelopmentofCuvierinidae(Mollusca,Eutheco-
GosportSandinAlabama.FromthesamerocksHodgkinson somata,Cavolinioidea)duringtheCainozoic:anon-cladisticap-
etal.(1992:34,pl.12figs9,10)recordedspecimensidenti- proachwithare-interpretationofRecenttaxa.–Basteria69:25-72.
fiedwiththesamenamethat,however,differsomewhat Janssen,A.W.&Peijnenburg,K.T.C.A.,inpress.HoloplanktonicMol-
fromthetypespecimen,buttheauthorsgaveargumentsto lusca:developmentintheMediterraneanBasinduringthelast30
considerthemtobelongtothesamespecies.Aspecimen Maandtheirfuture.In:Goffredo,S.&Dubinsky,Z.(eds).The
closelyresemblingHodgkinsonetal.’sillustrationswasre- MediterraneanSea:ItsHistoryandPresentChallenges.Springer.
centlyrecoveredfromtheBartonianofBendeAmeki(Nige- Jennings,R.M.,Bucklin,A.,Ossenbrugger,H.&HopcroftR.R.,2010.
ria,RGMcollection,unpublished).Tibiellareflexa Analysisofgeneticdiversityofplanktonicgastropodsfromseveral
Hodgkinson,inHodgkinsonetal.,1992,isaspeciesonly oceanregionsusingDNAbarcodes. -Deep-SeaResearchII,57:
knownfromfragments,recordedfromtheBartonianStone 2199-2210.
CityFormation,Texas.Allofthesetaxadiffersignificantly Kadar,D.,1986,Neogeneplanktonicforaminiferalbiostratigraphyof
fromthepresentnewspecies,thatappearstobeafurther thesouthCentralJavaarea,Indonesia.–GeologicalResearchand
developmentofT.texana.Itsoccurrenceat‘theothersideof DevelopmentCentre,SpecialPublication5:1-103.
theglobe’oncemoreindicateshowlittleisknownaboutthe Lelono,E.B.,2000.PalynologyoftheNanggulanFormation,Central
palaeobiogeographyofholoplanktonicmolluscs. Java,Indonesia.–Ph.D.thesis,DepartmentofEarthSciences,Royal
Holloway,UniversityofLondon,London:1-908(unpublished).
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