A new species of Lobatus (Caenogastropoda, Strombidae) from the Neogene of the Dominican Republic, with notes on further species from the Dominican assemblages

2010·1.3 MB·English

by  Landau, Bernard

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A new species of Lobatus (Caenogastropoda, Strombidae)
from the Neogene of the Dominican Republic,
with notes on further species from the Dominican assemblages
Bernard Landau
CentrodeGeologiadaUniversidadedeLisboa,CampoGrande,1749-016Lisboa,Portugal
InternationalHealthCentres,Av.InfantedeHenrique7,AreiasSãoJoão,P-8200Albufeira,Portugal;[email protected][Correspondingauthor]
Gijs C. Kronenberg
NetherlandsCentreforBiodiversityNaturalis,P.O.Box9517,NL-2300RALeiden,TheNetherlands;[email protected]
Carlos M. Da Silva
DepartamentoeCentrodeGeologia.UniversidadedeLisboa.C6.CampoGrande.1749-016LISBOA.Portugal;[email protected]
ficultiesoffossilstrombidtaxonomyandthegreatintraspe-
NewtaxonomicinsightsonthestrombidfaunaintheDo- cificvariabilitywithinthisgroup.However,afewoftheless 95
minicanRepublicarepresented.Lobatuspascaleaespec.nov. commonspeciesintheDominicanRepublicwerenot
isdescribed.StrombuswilsonorumPetuch,1994,Strombus recordedinFreiheit&Geary’s(2009)monograph.
(Lentigo)fetusJung&Heitz,2001,andStrombus(Tricornis) FollowingthegenericclassificationoftheCaribbean
magolecciaiMacsotay&Villaroel,2001,arealljuniorsubjec- StrombidaeoutlinedbyLandauetal.(2008)andFreiheit&
tivesynonymsofLobatusraninus(Gmelin,1791).Anup- Geary(2009),onlytwogenerahavesofarbeenrecognisedin
datedlistisgivenofStrombusandLobatusspeciesfromthe DominicanRepublicNeogeneassemblages,viz.Strombus
DominicanRepublicNeogene. Linnaeus,1758,andLobatusIredale,1921.Inthepresent
paperweaddfurthercommentsonthreeofthelesscom-
Keywords:Gastropoda,Strombidae,Lobatus,taxonomy,Neogene,Do- monLobatusspeciesfoundinthesedeposits,anddescribe
minicanRepublic. onenewspeciesofthatgenus.
Introduction Material and methods
TherichassemblageofStrombidaeintheNeogenedeposits ThematerialdescribedhereishousedintheNaturhis-
ofthenorthernDominicanRepublicwasaddressedrecently torischesMuseumBasel,SwitzerlandandtheBernardLan-
byFreiheit&Geary(2009)aspartofthe“DominicanRepub- daucollection,nowdepositedintheNaturhistorisches
licpaleontologyproject”(seeVokes,1989).Theirworkpro- Museum,Vienna,Austria.Furthermaterialwasstudiedin
videdagoodaccountofthemorecommontaxafoundin theGijsKronenbergcollection,Eindhoven,TheNether-
DominicanRepublicNeogenerocksandhighlightedthedif- lands.
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Abbreviations:ANSP,AcademyofNaturalSciencesofPhiladelphia, 53,pl.14fig.200;Coomans,1989:50,text-fig.51(pl.7);Seyer,1994:
U.S.A.;BL,BernardLandaucollection,nowdepositedintheNaturhis- 200;Merlano&Hegedus,1994:157,pl.49fig.574;Reed,1995a:325,
torischesMuseumWien(NHMW);BM(NH),TheNaturalHistoryMu- fig.2c(penis),fig.6a(sectionprostategland);Reed,1995b:331;
seum,London,U.K.;GK,GijsKronenbergcollection,Eindhoven,The Redfern,2001:pl.24fig.201A-B;Shawl&Davis,2004:157;Oliva
Netherlands;MHNG,Muséumd’histoireNaturelledeGenève,Geneva, Rivera&DeJ.Navarrete,2007:155,fig.4J(larvalshell).
Switzerland;NHMW,NaturhistorischesMuseumWien,Austria;NMB, StrombusaffinisGmelin,1791”:3520;Turton,1802:425.
NaturhistorischesMuseumBasel,Switzerland;UF,Universityof LambiscurrucaRöding,1798:64.
Florida,Gainesville,U.S.A.;ZMA,ZoologischMuseumAmsterdam, StrombusrarinusBosc,1801:250(errorpro.raninus,referstoKnorr
TheNetherlands;ZMMU,ZoologicalMuseumofMoscowStateUniver- Vergnügen6,pl.29fig.8).
sity,Moscow,Russia. StrombussulcatusG.Fischer,1807:188(juniorprimaryhomonymof
StrombussulcatusHolten,1802;seniorprimaryhomonymofS.sulca-
Systematic part tusAnton,1839,andofWatson,1886).
StrombusquadratusPerry,1811:pl.12fig.1[seealsoPetit,2003:46].
SuperfamilyStromboideaRafinesque,1815 StrombusbituberculatusLamarck,1822:690;Defrance,1827:114;Wood,
FamilyStrombidaeRafinesque,1815 1828:14,pl.4fig.15;Kiener,1843:15,pl.10fig.1;Chenu,1844:pl.
21figs3-5,pl.22figs3,4;Reeve,1851:pl.13fig.30;Chadwick,
GenusLobatusIredale,1921 1899:77.
StrombuslobatusSwainson,1823,captiontopl.153;G.B.SowerbyII,
Typespecies(bymonotypy):StrombusbituberculatusLamarck,1822(=S. 1842:34,pl.8figs76-78.
raninusGmelin,1791).EarlyPliocenetoRecent,WestIndiesand StrombusrarimusBosc,1830:235(errorpro.raninus,referstoKnorr
Florida. Vergnügenvol.6,pl.29fig.8).
96 Strombuscostosomuricatus“Martyn”Mörch,1852:61.
Discussion.―EvenifthenameLobatuswasahistoricalacci- Strombusraninusvar.pumilioMörch,1877:20(nomennudum).
dentasclaimedbyJung&Heitz(2001:40),referringtoAb- Strombus(Monodactylus)bituberculatus.Tryon,1885:112,pl.4figs32,33.
bott’s(1960:53)remarks,Iredale(1921:208)madethename Lobatusbituberculatus.Iredale,1921:208.
available.ThenameLobatuswascitedbyThiele(1929:255) Strombus(Strombus)raninus.Clench&Abbott,1941:pl.1,leftfig.(juve-
inthesynonymyofThiele’s“sectioEuprotomusGill1869”as nile),2,pl.2.
“Lobatus(Swainson)Anon.,1837,Iredale1921”.Subse- Strombus(Tricornis)raninus.Abbott,1960:53;Robertson,1961:4;Abbott,
quentlyLobatuswassavedfromoblivionbyPetuch(1994: 1974:144,pl.4,fig.1585;Lindner,1975:pl.17fig.3;Wagner&Ab-
263)asasubgenusofStrombus.Forfurtherdiscussionsee bott,1978:09-656;Walls1980:85,2unnumberedfigsbottomp.86;
Kronenberg&Lee(2007). Kronenberg&Berkhout,1984:310,pl.3fig.3;DeTurcketal.,1999:
31,pl.51figs1-8,pl.127fig.5;Karnekamp,2000:126.
Lobatusraninus(Gmelin,1791)(Figs1-4) StrombusraninusnanusBales,1942:19,pl.4a-b.
Strombus(Lobatus)wilsonorumPetuch,1994:75,84,pl.16fig.K(junior
StrombusraninusGmelin,1791:3511;Turton,1802:419;Bales1942:18, primaryhomonymofS.wilsonorumAbbott,1967).
pl.4c;VanHyning,1945:95,fig.onp.95[notfigsonpp96-98];Ab- StrombuspraeraninusKronenberg&Dekker,2000:5(replacementname
bott,1954:175,pl.5fig.c;Warmke&Abbott,1962:89,pl.2G;Rice forStrombuswilsonorumPetuch,1994,nonAbbott,1967).
&Kornicker,1962:373,pl.5figs5,10;DeJong&Kristensen,1965: Strombus(Lentigo)raninus.Jung&Heitz,2001:39,figs12-18.
26;Percharde,1970:75;Shoemaker,1971:72;VanPel,1973:4; Strombus(Lentigo)aff.raninus.Jung&Heitz,2001:39,fig.19.
Humphrey,1975:101,pl.8fig.5-5c;Dance,1977:85,bottomfig. Strombus(Lentigo)fetusJung&Heitz,2001:48,figs25,26A-D.
middlecolumn;Abbott&Dance,1982:76,middlerow,secondfig. Strombus(Tricornis)magolecciaiMacsotay&Villaroel,2001:51,pl.13figs
fromleft;Domaneschi,1983:11,figs5,12;Odé,1982:16;Rios1985: 19,21.
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Tricornisraninus.Simone,2005:fig.22(shell),figs178-189(anatomy), lectthespecimenillustratedbyMartini(1777,pl.83fig.836
189-191. [dorsalview])asthelectotypeofLambiscurrucaRöding,for
furtherconsiderationsforthislectotypedesignationseealso
Typematerialandsynonymy.― ForStrombusraninus Kronenberg(accepted).
Gmelin(1791:3511)referredtoKnorr’s(1775)Vergnügen, Strombusrarinus:Bosc(1801)usedthesamereferenceas
vol.6,pl.29fig.8.Thatfigure,basedonaspecimenfromthe Gmelin(1791:3511),viz.Knorr’s(1775)Vergnügenvol.6,pl.
Houttuyncollection(fideH.H.Dijkstra,e-mailNovember 29fig.8.WeconsiderS.rarinusalapsuscalamiforS.raninus
2009)isavailableonlineatwww.stromboidea.de/ (seealsofurtherbelow).Atypelocalitywasnotindicated.
?n=Species.LobatusRaninus, andhastheDutchvernacular Strombussulcatus:Lectotypeandparalectotypepresentin
name“RoodeKikvorsch”(redfrog,inancientDutch ZMMUL-718.ForfurtherdetailsseeIvanovetal.(1993),
spelling,henceraninus),butshowsthespecimenfroma whoillustratedboththelectotype(pl.3fig.1)andaparalec-
somewhatunfortunateangle.However,inouropinionitis totype(pl.3figs4,5).Weconcurwiththeirconclusions.A
recognizableasaspecimenofLobatusraninus.Although typelocalitywasnotindicated.
somematerialoftheHouttuyncollectionispresentinZMA Strombusquadratus:ThewhereaboutsofPerry’sspecimen
(H.H.Dijkstra,e-mailNovember2009),thisspecimencould arenotknown.Typelocality:“Ithasbeenfoundonlyinthe
notberecognised(pers.comm.RobMoolenbeek).Thepres- WestIndies”(Perry,1811).
entwhereaboutsofthisspecimenareunknown.Atypelo- Strombusbituberculatus:OnesyntypepresentinMHNG,
calitywasnotstated. MHNGINVE51949(formerlyMHNG1100/41)(Figs1,2).
Strombusaffinis:Gmelin(1791:3511)referredtoLister Thespecimenillustratedistheonlyremainingsyntypein
(1688:889fig.10).Inouropinion,thisfiguremostlikelyrep- theLamarckcollectioninMHNG.Hand-writtenannotations
resentsanimmaturespecimen(terminologyafterSavazzi, byLamarck’sdaughterinLamarck’scopyof“Animauxsans
1991)ofL.raninus.Gmelinpossiblywasawarethatitwas Vertèbres”inMHNGmentionthreespecimensoriginally 97
notanadultspecimen,asheadded“Luciferoaffinis”.To presentinthecollection(pers.comm.YvesFinet,MHNG,to
ourknowledgethisnamehasbeencitedonlybytwolater GK,January2010).Thewhereaboutsofthetwoothersyn-
authors:(1)Turton(1802:425),whocitedthesamereference. typesarenotknowntous.Typelocality:“Habitel’Océan
Headdedaverybriefdescription:“Shelltransverselystriate desAntilles”.
gibbous:spireunarmed,thefirstwhorlcrownedwithtuber- Strombuslobatus:Swainson’s(1823:pl.153)figuresun-
cles”.(2)Mörch(1852:61),inhissynonymyofStrombuscos- doubtedlyillustrateL.raninus.Thewhereaboutsofthespec-
tosomuricatus.AlthoughitwasnotlistedbyWilkins(1953), imenareunknowntous.Typelocality:“Found,ingreat
wecannotexcludethepossibilitythatthespecimenillus-
tratedbyListerwasoncepartoftheSloanecollectionand
maystillbepresentinBM(NH).Atypelocalitywasnot Figs1-9.Lobatusspp.1-2,Lobatusraninus(Gmelin,1791),syntypeofStrom-
stated.Asfirstrevisers,weselectthenameStrombusraninus busbituberculatus,MHNGINVE51949(exMHNG1100/41),height88.6
asthevalidnametobeusedforthespeciesnamedboth mm;"Habitel'OcéandesAntilles";photographsPh.Wagneur,MHNG;
StrombusraninusandStrombusaffinisbyGmelin(1791). 3-4,Lobatusraninus(Gmelin,1791),dwarfspecimen,GK 5858,height40.1
Lambiscurruca:RödingreferredtoGmelin(1791:3511, mm;Recent,BastimentosIsland,BocasdelToro,Panama,leg.Monika
speciesno.11),Martini(1777:pl.83figs836-837)andDeFa- Forner,don.RonP.Voskuil,photographsBernardLandau;5-9,Lobatus
vanne&DeFavanne(1780:pl.21fig.A4).Röding’srefer- vokesaeLandau,Kronenberg&Herbert,2008,NMBH18405,height230.0
encesareamixtureoftwospecies;Gmelin’s(1791:3511, mm;GuraboFormation,LateMiocene-EarlyPliocene;CibaoValley,Rio
spec.no.11)isStrombusgallus(hereassignedtoLobatus), Gurabo,Loc.NMB16810,DominicanRepublic,leg.P.Jung&J.Geister,
whileMartini’sfiguresclearlydepictwhatisnowreferredto 17.III.1979,photographsVirgilioLiverani.
asLobatusraninus.Atypelocalitywasnotindicated.Wese-
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abundance,invariouspartsoftheWestIndiaseas.” morestronglysteppedspirewithmoreheavilysculptured
Strombusrarimus:Bosc(1830)againusedthesamerefer- whorls,morenumerous,smallerknobsontheshoulderof
enceasbefore(Bosc,1801),viz.Knorr’s(1775)Vergnügen thelastwhorl,andamoreprojecting,pointedlip.AsforS.r.
vol.6,pl.29fig.8.Inallprobability,rarimusisasecondmis- nanus,wefindthedistinguishingcharactersmentionedby
spellingforraninus.,i.e.yetanotherlapsuscalami.Again,a PetuchexpressedinRecentspecimensfromvariouslocali-
typelocalitywasnotindicated. ties,andthereforeconsiderS.wilsonorumPetuchtobeajun-
Strombuscostosomuricatus:Mörch(1852)usedMartyn’s iorsynonymofL.raninus.NotethatStrombuspraeraninus
(1784)nameasanavailablename.TheworkbyMartynwas Kronenberg&Dekker,2000wasintroducedasanewname
subsequentlyrejectedinICZN(Opinion456,1957),sothe forS.wilsonorumPetuch,1994(ajuniorprimaryhomonym
namemustbeattributedtoMörch.Typelocality:Antill[es] ofS.wilsonorumAbbott,1967),andthereforethetypemate-
(Mörch,1852:61). rialandlocalityforS.praeraninusarethesameasforS.
Strombusraninusvar.pumilioMörch,1877:Accordingto wilsonorum,andS.praeraninusisafurthersynonymofL.ran-
Rosenberg(2009)thisisanomennudum.Typelocality:Vera inus.Typelocality:HoleyLandFauna,CapelettiBros.Pit
Cruz. #11,NW47thwestofFloridaTurnpike,Miami,DadeCounty,
Strombusraninusnanus:Holotypeand1paratypeANSP Florida,U.S.A.
178696.Bales(1942:18,pl.4a,b)introducedthisasadistinct Strombus(Lentigo)fetus:HolotypeNMBH17854.Jung&
subspecies,statingfourdifferences:1)thesmallsize;2)the Heitz(2001:50)statedthatStrombusfetuswasnotrelatedto
lengthofthetipoftheouterlip;3)thedarkercoloration; anyoftheotherspeciesdiscussedbythem.Thisremarkis
and4)themuchfiner“grain”oftheshell.However,speci- surprising,astheonlydifferencetheymentionedfromS.
mensmatchingthedescriptionbyBalesoccurthroughout raninusistheabsenceoflargeknobs–referredtoasspines
therangeofL.raninus(seefurtherbelow)andweconclude byJung&Heitz–inS.fetus.LikeJung&Heitz,wedonot
100 thatthisnameisajuniorsynonymofLobatusraninus.Type seeanyotherdifferences.WehaveexaminedspecimensofL.
locality:southernendofLakeWorth,PalmBeachCounty, raninuswithknobsofintermediatesizebetweenthecom-
Florida,U.S.A. mon,coarselysculpturedformandtheformnamedS.fetus
Strombus(Lobatus)wilsonorum:HolotypeUF66215.Petuch byJung&Heinz(2001)(GK).Therefore,weconsiderS.fetus
(1994:263,pl21K)differentiatedhisnewspeciesfromL.ran- tobeafurtherjuniorsynonymofS.raninus.Typelocality:
inusbyhavinganarrower,morecylindricalshell,ahigher, NMBlocality18677(=PanamaPaleontologyProjectlocality
02178),1kmeastofLongBayPoint,NcoastofEscudode
Veraguas,BocasdelToro,Panama;EscudosdeVeraguas
Figs10-19.Lobatusspp.10-12,Lobatusgalliformis(Pilsbry&Johnson, Formation(latePliocene).
1917),NHMW2010/0037/0001(ex.BL),height70.5mm;GuraboForma- Strombus(Tricornis)magolecciai:Theholotypewasnever
tion,LateMiocene-EarlyPliocene;CibaoValley,RíoAmina,Loc.TU depositedinareferencecollection,andremainsinOliver
1219,DominicanRepublic;13-15,Lobatuspascaleaespec.nov.,holotype, Macsotay’sprivatecollection(OliverMacsotaypers.comm.
NHMW2009z0094/0001(ex.BL),height42.5mm;unnamedunitof 2010).DescribedfromtheRecentfaunaoftheMargarita
sameageasCercadoFormation(lateMiocene),sandyfaciesjustabove platform,Venezuela,S.magolecciaisupposedlydiffersfrom
mouthofAngosturaGorge,RioYaquedelNorte,DominicanRepublic; Lobatusraninusinhavingtheouterlipwingextendingbe-
16-19,Lobatuspascaleaespec.nov.,paratype,NMBH18404,height48.0 yondtheheightofthespireinasingleloberatherthantwo,
mm;BaitoaFormation,lateEarly-earlyMiddleMiocene,LópezSection, inhavingtwelvesmallnodulesonthelastwhorlratherthan
RioYaquedelNorte,Loc.NMB17265,DominicanRepublic;leg.P.Jung twolargeones,andinhavingayellowishwhiteratherthan
&J.Geister,17.III.1979;photographsBernardLandau. redorblueaperture(Macsotay&Villaroel,2001).While
mostspecimensofLobatusraninusdohavetwolobesonthe
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posterioredgeoftheouterlip,wehaveRecentspecimensat alsoknownfromAruba(Karnekamp,2000).Dwarfspeci-
hand(GK)alsowithasinglelobefromotherlocalities,and mensintheGKcollectionarefromAmbergrisCay,Belize
theouterwingextensionvariesinlengthfrombelowthe (leg.H.Conley,don.AlanG.Beu),BastimentosIsland,Bocas
apextoreachingbeyondit.Thenumberofsmallerknobs delToro,Panama(Figs3,4),YupehIsl.,Panama,exRob
correspondswiththeformnamedS.fetusbyJung&Heitz. Walburg,andAruba,Paardenbaai(leg.etdon.J.Berkhout).
Asfarasthecolouroftheapertureisconcerned,wehave Inouropinion,S.fetus,S.raninusnanusandS.(Tricornis)
examinedspecimenswithawhitethroughoffwhite, magolecciaiMacsotay&Villaroel,2001arealltrivialvariants
slightlypinkishtoareddishcolour.Ablueaperturehasnot ofL.raninus.
beenobservedbyus,andweconsideritmorelikelythatthe Distribution.―EarlyPliocene:GuraboFormation,Do-
exteriorcolourofthelastwhorl,whichcanhaveabluish minicanRepublic(Jung&Heitz:2001).LatePliocene:Es-
greytone,showsthroughtheinnerlipcalluslayerofsome cudodeVeraguasFormation,EscudodeVeraguasIsland,
specimens.Inouropinion,Strombusmagolecciaiisanother BocasdelToro,Panama(Jung&Heitz:2001).Plio/Pleis-
juniorsynonymofL.raninus.Typelocality:quadrantG-17 toceneboundary:MoínFormation,CostaRica(Jung&
ofMacsotay&Villaroel(2001:map2),Margaritaplatform, Heitz:2001).Pleistocene:HoleyLandUnitofPetuch(1994),
Venezuela. Florida,USA;Barbados(Jung&Heitz:2001);GroundCreek
Materialanddimensions.―OnespecimenNMBH Formation,IslaColón,BocasdelToro,Panama(Jung&
17806,fromNMBlocality18952(=TU1206),roadcutatkm Heitz:2001);Haiti(Jung&Heitz:2001).Holocene:Antigua
17,highwayfromSantiagotoSanJosédelasMatas,westof (Jung&Heitz:2001);IslaMargarita,CubaguaIsland,
bridgeoverRioYaquédelNorteatSantiagodelosCa- Venezuela(BL).Recent:NorthCarolinatoBrazil(Odé:1982;
balleros,DominicanRepublic.GuraboFormation(probably Rios:1985).
EarlyPliocene).Height77.3mm,width67.4mm(illustrated
byJung&Heitz2001,fig.19A-D). LobatusvokesaeLandau,Kronenberg&Herbert,2008 101
Remarks.―TheshellillustratedbyJung&Heitz(2001: (Figs5-9)
38,fig.19A-D)asStrombus(Lentigo)aff.raninusGmelinfits
wellwithintherangeofvariationofthisspecies.We(BL, LobatusvokesaeLandau,Kronenberg&Herbert,2008:33,figs1-7.
CMS)havefoundnofurtherspecimensinDominicanRe- ?Lobatusdominator(orL.vokesae?).Freiheit&Geary,2009:12,text-fig.7.
publicNeogenerocks. ?Lobatusdominator.Freiheit&Geary,2009:pl.8figs11-12[inpart;not
Jung&Heitz(2001:48,fig.26A-D)describedthenew pl.8figs1-10;pl.9figs1-9=LobatusdominatorPilsbry&Johnson,
speciesStrombus(Lentigo)fetusfromtheLatePlioceneEs- 1917]
cudodeVeraguasFormation,EscudodeVeraguasIsland,
BocasdelToro.Intheirdiscussiontheycommentedthatde- Remarks.―Aswewereawareofeachother’sworkonDo-
spitethegeneralshapeandapicalanglebeingsimilartothat minicanStrombidae,DanaGearykindlymadethemanu-
ofS.raninus,theresemblancewassuperficialandthatthe scriptofFreiheit&Geary(2009)availabletothefirsttwo
lasttwoknobsontheshoulderofthelastwhorlwerenotde- authorspriortopublication.Basedonthismanuscriptand
velopedasinS.raninus.Lobatusraninusis,likemanystrom- knowingthatitwouldnotinterferewiththeworkbyFrei-
bids,quitevariableinsize,sculptureandcolour,bothonthe heit&Geary(2009),Landauetal.(2008)wereabletode-
shellexteriorandwithintheaperture.ThenameStrombus scribeanewspecies,LobatusvokesaeLandau,Kronenberg&
raninusnanusBales,1942wasestablishedfordwarfspeci- Herbert,2008,basedonspecimenscollectedbyLandaudur-
mensfromLakeWorth,PalmBeachCounty,Florida,U.S.A. ing2003-2007.Althoughitwasnotdiscussedindetail,L.
Dwarfsarearathercommonphenomenoninnearlyall vokesaesubsequentlywasacceptedbyFreiheit&Geary
strombidtaxa,andL.raninusisnoexception.Dwarfsare (2009).
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LobatusvokesaeisrareintheDominicanRepublicde- LobatusgalliformisisrareintheDominicanRepublicas-
posits,andwetaketheopportunitytoillustrateabeautiful semblages,andwetakethisopportunitytoillustrateacom-
largespecimenfromlocalityNMB16810,inGuraboForma- pletespecimen(NHMW2010/0037/0001,exBL;Figs10-12)
tionontheGuraboRiver,intheNMBcollections(NMB withmorestronglydevelopedshoulderspinesonthelast
H18405).Atthetimeofwritingtheinitialdescriptionthis whorlthananyofthespecimensfiguredbyFreiheit&
specimenwasoutonloan,otherwiseitwouldcertainlyhave Geary(2009:pl.7figs1-5,8-14)
beenchosenastheholotype.Itwasprobablyevenlarger Distribution.―EarlyPliocene:GuraboFormation,Do-
thantheparatype,asitissimilarinsize,andtheanterior minicanRepublic(Freiheit&Geary,2009).
portionoftheshellismissing.Thepositionoftheknobson
thelastwhorlissimilartothatofthetwotypespecimens, Lobatuspascaleaespec.nov.(Figs13-19)
althoughthedorsalknobontheBaselshellismassivelyde-
veloped.Theshapeofthespireandthesculptureagrees Typeseries.―HolotypeNHMW2009z0094/0001(Figs13-15;ex.BL),
withthoseintheoriginaldescription.Theposteriorportion height42.5mm,fromNMBlocalityno.17265,unnamedunitofsame
andperipheryoftheouterlip,missinginthetypematerial, ageasCercadoFormation(lateMiocene),clayeyfacies2.5km(0.7km
cannowbedescribed.Posteriorly,theouterlipdevelopsa straightline)upstreamfromthemouthofAngosturaGorge,RioYaque
widealation,whichextendswellbeyondtheapex. delNorte,DominicanRepublic(seeFig.18);paratype,NMBH18404
Distribution.―EarlyPliocene:CercadoandGurabo (Figs16-19),height48.0mm,fromnannofossilzone5,ArroyoHondo
Formations,DominicanRepublic(Landauetal.,2008). Section,RioYaquedelNorte,Loc.NMB17265(Saundersetal.,1986:
text-figure21).
Lobatusgalliformis(Pilsbry&Johnson,1917)(Figs10-12)
Etymology.―NamedforPascalePaques,friendofthefirst
102 StrombusgalliformisPilsbry&Johnson,1917:170;Pilsbry,1922:366,pl. author,forherencouragementandsupport.
31figs1-2.
Lobatusgalliformis.Freiheit&Geary,2009:20,pl.7figs1-5,8-14[inpart; Diagnosis.―AsmallLobatusspecieswithaspireof
notfigs6-7=Lobatuspascaleaespec.nov.]. mediumheight,sculptureofwelldevelopedknobsatthe
shoulder,spiralsculptureonspirewhorlsandthelast
Remarks.―Freiheit&Geary(2009:21)commentedthatal- whorl,anelongatedlastwhorl,anarrowaperture,anar-
thoughLobatusgalliformis(Pilsbry&Johnson,1917)isthe rowedandposteriorlyflaredouterlipextendingjustbeyond
leastcommonstrombidintheDominicanRepublicassem- theadapicalsutureofthepenultimatewhorl,awell-devel-
blages,itstemporalrangeexceedsthatofLobatusdominator opedstromboidnotch,andverystronglirationswithinthe
(Pilsbry&Johnson,1917)andL.haitensis(G.B.SowerbyI, outerlipandcolumella.
1850).Allthespecimensrecordedbythemarefromthe Description.―Teleoconchwith6whorlspreserved,
GuraboFormation,exceptthesinglespecimenfromlocality medium-sized,solid,withconicalspireofmediumheight,
NMB17265ontheLopezsectionoftheYaquedelNorte somewhatscalate;lastwhorlelongate,relativelynarrow.
River(Freiheit&Geary,2009:pl.7,figs6-7;Figs16-19).Here Protoconchmissing;earlyteleoconchsculptureabraded.
weconsiderthisspecimentorepresentadistinctspecies;Lo- Spirewhorlswithbroad,slightlyconcavesubsuturalramp,
batuspascaleaespec.nov.TwospecimensofL.galliformisare peripheryatshoulder,surfacebetweenshoulderandabapi-
presentinBL,onefromlocalityTU1219,AminaRiver,and calsutureflattoslightlyconcave.Sutureimpressed,linear.
theotherfromMaury’sBluff1ontheMaoRiver.Bothlocali- Fourthteleoconchwhorlwithaxialsculptureof14ribs,de-
tieswereassignedtoGuraboFormationbySaundersetal. velopedclearlyonlyatshoulder,whereribsformonerowof
(1986).ItthereforeseemsthatL.galliformisisrestrictedtothe strong,rounded,bluntknobs.Spiralsculptureofrathernar-
GuraboFormation. row,regularcordsoverridingshoulderknobs.Lastwhorl
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elongate,withnarrow,concavesuturalrampformedbyone ThebedoftheYaquedelNorteRiverisverydynamicand
rowofroundedtopointedknobs,weaklyconvexbelow accordinglytheunitsexposedchangerapidly.Conglomerate
knobs,withsecond,subobsoleterowofknobsatmid-whorl; andcoarsetofinesandandclayareexposedindifferentsec-
baseslightlyconstricted.Spiralsculptureofrelativelynar- tionsoftheriverbedwhenitisatitslowest.Theclayeyunit
rowcords,wornovermid-whorlonholotype,wellpre- thattheholotypeofLobatuspascaleaespec.nov.wascollected
servedonparatype.Apertureelongate,narrow;outerlip fromissituatedabout2.5kmupstream(0.7kminastraight
thickened,withwell-developedstromboidnotch;strongly line)fromthemouthofAngosturaGorge,RioYaquedel
anddeeplyliratewithin.Lipgreatlybutnarrowlyalate Norte.TheparatypewasalsofoundontheYaquedelNorte
adapically,flaredareaextendingalmosttomid-spire,suture River,furtherupstreamontheeastside,justbelowthe
ascendingwithlipflare.Siphonalcanalopen,relatively mouthofArroyoHondo(localityNMB17265).Therocksat
short,somewhatrecurved.Columellarcalluswelldelimited, NMB17265areslightlyolderthanatthetypelocalityac-
somewhatthickened,weaklyexpanded.Anteriorandpari- cordingtoSaundersetal.(1986,textfigs24,25,table3),and
etalportionsofcolumellastronglylirate. belonginthelateEarlyorearlyMiddleMioceneBaitoaFor-
Geologicalsetting.―Thenewspeciesisrepresentedby mation.L.pascaleaehasastratigraphicrangefromlateEarly
aspecimenfromanunnamedformationintheLópezsec- MiocenetoLateMiocene.
tionoftheYaquedelNorteRiver,ascribedtothesameage Remarks.―Lobatuspascaleaespec.nov.isthesmallestof
astheCercadoFormation(LateMiocene)byVokes(1989: theDominicanRepublicNeogeneLobatusspeciesweare
19-20).Itwasfoundinaclayeyunitintheriverbed,closeto awareof.Itisrepresentedbyonlytwospecimens,whichare
theeastbank,andisprobablyalsoofLateMioceneage bothfullyadultandaresimilarinsize.Freiheit&Geary
(EmilyVokes,pers.comm.). (2009)confusedthenewtaxonwithLobatusgalliformis(Pils-
bry&Johnson,1917),butthatspeciesdiffersinhavinga
largershell,itsouterlipisthin-edgedandmorewidelyex- 103
panded,stronglyalateontheposterioredge,extendingfur-
theradapically,totheapexinmanyspecimens.InL.
pascaleaetheouterlipislessexpandedthaninL.galliformis,
resultinginanarroweraperture,ithasathickenededge,
andtheposterioralationistruncated,notextendingabove
themiddleofthespire.Thepositionoftheshoulderknobs
onthelastwhorlisslightlyhigherinL.galliformisandthe
knobsaremorestronglydeveloped,especiallythedorsal
one(seeFigs10-12),whereasthoseofbothspecimensofL.
pascaleaespec.nov.haveratherstubbyshoulderknobs.Also,
althoughmostspecimensofL.galliformishavesomeliraeon
theposteriorand/oranteriorportionsoftheouterlipandon
themostanteriorextremityofthecolumella(Fig.8;Freiheit
&Geary2009:pl.7figs3,5,9,11,14),nonehaswell-devel-
opedstriaecoveringtheentireinterioroftheouterlipand
columellaasinL.pascaleaespec.nov.
Lobatuspascaleaespec.nov.resemblessome“dwarf”
Fig.20.Geographicallocationofstudyarea.Thestarmarksthetypelo- specimensofLobatusraninus(Figs3-4).Theysharethesame
calityofLobatuspascaleaespec.nov. generalshapeandornamentandstrongliraeonboththein-
sideoftheouterlipandthecolumella.However,theshellof
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B74-Landau-Kronenberg:Basteria-2010 13/11/2010 14:42 Page 104
L.pascaleaespec.nov.hasamoreelongateform,theshoulder sutureofthepenultimatewhorl,butthisposteriorextension
isplacedslightlyloweronthelastwhorl,thesecondary tothelipisroundedandnotnarrowlyelongateasinL.pas-
rowsofspiralknobsbelowtheshoulderarehardlydevel- caleaespec.nov.Thetwocanbedistinguishedimmediately
oped,theouterlipislessflaredandlessalateposteriorly, bytheshapeofthespire,whichismoreacuteinP.aldrichi,
withasingleloberatherthanadoubleoneasusuallyseen themoreexpandedouterlipandthelessernumberofmore
inL.raninus,thestromboidnotchisshallower,andthe stronglydevelopedshoulderknobsinP.aldrichi.Sympatric
siphonalcanalisshorterandlessposteriorlyrecurvedinL. withP.aldrichiintheChipolaBedsisP.mardieae(Petuch,
pascalaespec.nov.thaninL.raninus.Also,thewholeventral 2004).ThisdiffersfromP.aldrichiinhavingmorenumerous
sideofthelastwhorliscoveredinathincolumellarcallous shoulderknobsandalessexpanded,straightouterlip,
washinL.raninus,whereasinL.pascaleaethecolumellarcal- whichdoesnotriseabovetheshoulderofthepenultimate
lusiswelldelimitedandrestrictedtoanarrowbandborder- whorlandhasnoposteriorflare.ComparisonofP.mardieae
ingtheleftsideoftheaperture. withL.pascaleaespec.nov.ishardlynecessary,thetwodif-
ComparisonwiththeotherDominicanRepublicNeo- feringcompletelyinthecharacteroftheirouterlip.
geneLobatusspeciesishardlynecessary,asL.haitensis(G.B. SeveralotherTropicalAmericanNeogenetaxawerein-
SowerbyI,1850;seePetit(2009)fordiscussiononauthor- cludedbyKronenberg&Lee(2007)inthegenusPersis-
ship),L.dominator(Pilsbry&Johnson,1917)andL.vokesae tistrombus.Persististrombustoroensis(Jung&Heitz,2001)is
Landau,Kronenberg&Herbert,2008areallmuchlarger. knownfromtwoincompletespecimensfoundintheearly
Apartfromsize,L.haitensishasaverysolidshellwitha PlioceneCayoAguaFormation,CayoAguaIsland.Persis-
well-developed,elevatedknobattheshoulder,whilstL. tistrombusinsulanus(Jung&Heitz,2001)isknownfroma
dominatorandL.vokesaehavearathertriangularcross-sec- singleincompletespecimenfromthemiddlePlioceneEs-
tionattheshoulderofthelastwhorlduetoawell-devel- cudodeVeraguasFormation,EscudodeVeraguasIsland;
104 opedandoftenmassivedorsalshoulderknob.In thesearebothintheBocasdelTororegionofCaribbean
comparison,L.pascaleaespec.nov.hasamoreevenlycircular Panama.BothspeciesaremembersoftheP.granulatus
cross-section,asitsshoulderknobsaremuchsmaller. group,differingindetailswhichfallwithinthehugerange
AllocationtoLobatusismadewithalittlehesitation,as ofvariabilityofP.granulatus.
theapertureisrelativelynarrowandtheouterlipnotas Persististrombusobliteratus(Hanna,1926)wasdescribed
stronglydilatedasinotherspeciesofLobatus.Theallocation fromAlversonCanyon,CoyoteMountain,ImperialCounty,
toLobatusisbasedon(1)theconspicuousextensionofthe California,andisprobablyoflateMioceneage(Powell,
outerlip,acharacterthatisabsentinPersististrombusKro- 1988).Theshellofthisspeciesismuchshorterandstouter
nenberg&Lee,2007,exceptforP.kronenbergiHarzhauser, thanthatofL.pascaleaespec.nov.,andischaracterizedbya
2009fromtheearlyMiocene(Aquitanian)ofTanzania, rowofprominentshoulderknobs(muchmorestronglyde-
whichhasthischaracteronlyslightlydeveloped,and(2)the velopedthanthoseofL.pascaleaespec.nov.),tworowsof
presenceofplicaeonthecolumellainL.pascaleaespec.nov., welldevelopedspinesonthelastwhorland,placedabapi-
acharacternotalwaysexpressedinRecentspeciesallocated callytothesetworows,athirdrowofknobsfusedintoa
toLobatus,buttoourknowledgeneverfoundinspeciesas- spiralridge.Theouterlipisalsomuchmoredilatedthanin
signedtoPersististrombus.Neverthelessweconsiderituseful ournewspecies.ThedistinctplicaevisibleinL.pascaleae
tocompareournewtaxonwithothertropicalAmerican spec.nov.,onboththecolumellaraswellastheadcolumel-
Neogenetaxa,especiallythoseassignedtoPersististrombus. larsideoftheouterlip,areabsentinP.obliteratus.Theshell
Persististrombusaldrichi(Dall,1890)fromtheEarly ofL.pascaleaespec.nov.isalsoconsiderablysmaller(Hanna
MioceneChipolaBedsofFloridaisoneoftheearliestknown mentions61.0mmforP.obliteratus),althoughstrombids
membersofthegenusintheCaribbean.Italsohasaposteri- varyconsiderablyinadultsizewithinonespecies.
orlyexpandedouterlipwhichcanriseabovetheadapical Lobatuspascaleaespec.nov.bearsasuperficialresem-
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