A new species of living scallop of the genus Mirapecten (Bivalvia, Pectinidae) from French Polynesia

2011·0.69 MB·English

by  Dijkstra, Henk H

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A new species of living scallop of the genus Mirapecten
(Bivalvia, Pectinidae) from French Polynesia
Henk H. Dijkstra
NetherlandsCentreforBiodiversity(NCBNaturalis),DepartmentofMarineZoology,
P.O.Box9517,2300RALeiden,TheNetherlands;[email protected]
Acronymsandabbreviations:BDR,P.Bouchet,B.Dayrat&
Mirapectenboutetorumspec.nov.isdescribedfromFrench B.RicherdeForges;GNS,GNSScience,LowerHutt,New
Polynesia.Itiscomparedwithseveralcongenericspecies Zealand;MNHN,Muséumnationald’Histoirenaturelle,
fromtheIndo-PacificandGloripalliumspiniferum(Sowerby Paris,France;NCBNaturalis,NetherlandsCentreforBiodi- 63
1st,1835)fromFrenchPolynesia. versity,Leiden,TheNetherlands;NHMUK,NaturalHistory
Museum,London,UnitedKingdom;NMNH,National
Keywords:Bivalvia,Pectinidae,Mirapecten,newspecies,FrenchPolynesia. MuseumofNaturalHistory,SmithsonianInstitution,
WashingtonDC,UnitedStates;ZMA,ZoologicalMuseum
Amsterdam,nowpartoftheNetherlandsCentrefor
Introduction Biodiversity(NCBNaturalis),Leiden,TheNetherlands.
Forshellcharacters:C,convexity(thicknessofboth
RecentlyMessrs.MichelBoutetandJeanLetourneux(Tahiti, valves);H,height(dorsal-ventral);lv,leftvalve(upper
FrenchPolynesia)sentmeimagesoflive-takenspecimensof valve);pr,paired(articulated)valves;rv,rightvalve(lower
apreviouslyundescribed,rare,coral-dwellingpectinidfrom valve);W,width(anterior-posterior).
FrenchPolynesia.Inthepastthisspecieshasbeenidentified ThetypematerialofM.boutetorumispreservedin
erroneously,mainlybasedonsinglevalvesofjuvenilemate- MNHN(holotype)andZMA(paratype).Additionalstudied
rial,as“Gloripalliumspiniferum(Sowerby1st,1835)”,alsoa materialisalsokeptintheseinstitutes.
rarecoral-dwellingspeciesfromthesameregion.Thenew
speciesisdescribedinthepresentpaper.Itisthesecond Systematic part
MirapectenspeciesknownfromFrenchPolynesia.Forcom-
parison,thetypematerialofthecongenericspecies FamilyPectinidaeRafinesque,1815
ComptopalliumspiceriRehder,1944,fromtheLineIslandsis SubfamilyPectininaeRafinesque,1815
figuredhere,aswellastheholotypeofPectenspiniferusG.B. TribeDecatopectininiWaller,1986
Sowerby1st,1835,fromtheTuamotuArchipelago.
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MirapectenDall,Bartsch&Rehder,1938 photograph;
Rombouts,1991:pl.15fig.6;Raines&Poppe,2006:125(figuredrv),pl.
MirapectenDall,Bartsch&Rehder,1938:84,pl.21figs7-8.Typespecies 74fig.[5](lv).NotPectenspiniferusG.B.Sowerby1st,1835.
(byoriginaldesignation):MirapectenthaanumiDall,Bartsch&Re-
hder,1938(juniorsynonymofPectenmirificusReeve,1853).Recent, Materialexamined.—FrenchPolynesia:SocietyIslands,Tahiti,NNW-
Indo-Pacific. coast,Arue,ocean-sideofbarrierreef,17˚30’S149˚31’W,60m,alive,
SomalipectenWaller,1986:41.Typespecies(byoriginaldesignation):So- dive,2008,2pr(holotype,MNHN23879,paratypeZMAMoll.4.11.013);
malipectencranmerorumWaller,1986;Recent,offSomalia. Maupiti,16˚25’S152˚17’W,437-536m,dead,dredged,N.O.“Alis”,leg.
P.Bouchetetal.,12.x.2009(TARASOC,stnDW3408),1lv(MNHN);
Diagnosis.—Medium-sizedspeciesofDecatopectinini,with Moorea,17˚28’S149˚48’W,485-560m,dead,dredged,leg.P.Bouchetet
5-7evenlyspacedprimarysquamousliraeto7-11unevenly al.,19.x.2009(TARASOC,stnDW3459),1lv(MNHN);Tahiti,17˚47’S
spacedprimaryandsecondarylirae,squamousonmost 149˚21’W,400-440m,dead,dredged,leg.P.Bouchetetal.,23.x.2009
specimens,noduliferousorsmoothonothers;inequivalve, (TARASOC,stnDW3487),fragmentrv(MNHN);Tahiti,17˚34’S
valvesflattened,subcirculartocircular,rightvalveslightly 149˚18’W,350m,dead,dredged,leg.P.Bouchetetal.,25.x.2009
moreconvexthanleftone,inequilateraltoequilateral,auri- (TARASOC,stnDW3503),fragmentrv(MNHN).
clesunequalinsize;microsculptureofcloselyspacedcom- AustralIslands,Rurutu,Avera,22˚29’S151˚21.8’W,212-450m,dead,
marginallamellae;internalribcarinaepresent.Hingewith dredged,N.O.“Alis”,leg.IRD-MNHN,23.xi.2002(BENTHAUS,stn
prominentdorsalteethandweakresilialteeth,intermediate DW1995),fagmentlv(MNHN).
teethlacking;byssalnotchmoderatelydeep,byssalfasciole MarquesasIslands,UaPou,9˚19’S140˚06’W,200m,dead,dredged,
rathernarrow,ctenoliumwell-developed. N.O.“Alis”,leg.BDR,22.viii.1997(MUSORSTOM9,stnDW1146),1rv
Distribution.—MiocenetoRecent(Hayami,1989:16). (MNHN);NukuHiva,8˚45.6’S140˚03.9’W,90-120m,dead,dredged,
64 TropicalIndo-WestPacific;livinglittorallytosublittorally N.O.“Alis”,leg.P.Bouchet,B.Dayrat&B.RicherdeForges,26.viii.1997
amongstcoralorcoralrubbleonsoftsediments. (MUSORSTO(M9,stnDR1182),2rv(MNHN);HivaOa,9˚52.7’S
Discussion.—Hertlein(1969:N366)treatedMirapecten 139˚02.2’W,60-61m,dead,dredged,N.O.“Alis”,leg.BDR,28.viii.1997
asasubgenusofSemipallium[Jousseaume]Lamy,1928,and (MUSORSTOM9,stnDW1203),1rv(MNHN);HivaOa,9˚48.9’S
placeditinthesupragenericgroupofDecatopecten.Waller 139˚09.5’W,117m,dead,dredged,N.O.“Alis”,leg.BDR,28.viii.1997
(1986:40),followedbyVaught(1989:119),consideredMi- (MUSORSTOM9,stnDW1208),2rv(MNHN);HivaOa,9˚50.2’S
rapectentobeafullgenusinthetribeDecatopectinini.Mi- 139˚02.5’W,85m,dead,dredged,N.O.“Alis”,leg.BDR,29.viii.1997
rapectencanbedistinguishedfromGloripalliumbythe (MUSORSTOM9,stnDW1209),1lv(MNHN);HivaOa,9˚44.2’S
followingmorphologicalcharacters,inhavinggenerallydis- 138˚52.5’W,84-85m,dead,dredged,N.O.“Alis”,leg.BDR,30.viii.1997
similardevelopedprimaryandsecondaryradialsculpture (MUSORSTOM9,stnCP1227),2lv(MNHN);HivaOa,9˚44.6’S
(Gloripalliumsimilardevelopedprimaryradialsculpture),in 138˚51.5’W,107-108m,dead,dredged,N.O.“Alis”,leg.BDR,
lackingmacrosculptureontheanteriorauricles(Gloripallium 30.viii.1997(MUSORSTOM9,stnCP1228),1lv(MNHN);HivaOa,
withprominentnoduliferousmacrosculpture),inhaving 9˚42’S139˚04’W,95-305m,dead,dredged,N.O.“Alis”,leg.BDR,
weakinternalribcarinaecommencinginlategrowthstage 31.viii.1997(MUSORSTOM9,stnCP1237),1lv(MNHN);FatuHiva,
(Gloripalliumwithstronglydevelopedinternalribcarinae 10˚28’S138˚42.1’W,1015-1020m,dead,dredged,N.O.“Alis”,leg.BDR,
commencinginearlygrowthstage).Forcomparisonwith 01.ix.1997(MUSORSTOM9,stnDR1244),1lv(MNHN);EiaoIsland,
SomalipectenWaller,1986,seeDijkstra&Kilburn(2001:283). 7˚54.6’S140˚40.1’W,100-120m,dead,dredged,N.O.“Alis”,leg.BDR,
05.ix.1997(MUSORSTOM9,stnDW1274),7lv,5rv(MNHN),1lv
Mirapectenboutetorumspec.nov.(Figs1-12) (ZMA);MotuOne,7˚48’S140˚21’W,450-455m,dead,dredged,N.O.
“Alis”,leg.BDR,07.ix.1997(MUSORSTOM9,stnDW1281),10lv,5rv
Gloripalliumspiniferum(Sowerby);Dijkstra,1989:15,fig.,[31],colour (MNHN),1rv(ZMA);Eiao,7˚54’S140˚40’W,163-245m,dead,dredged,
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N.O.“Alis”,leg.BDR,07.ix.1997(MUSORSTOM9,stnDW1287),1lv,3 resiliumtriangular,elongate;weakauricularridgesnearan-
rv(MNHN);UaHuka,8˚54.1’S139˚37.8’W,95-100m,dead,dredged, teriorandposteriormargins.Innersurfaceplicatedand
N.O.“Alis”,leg.BDR,08.viii.1997(MUSORSTOM9,stnDR1292),1ju- glossy,withshortandweakinternalrib,carinateedgeson
venilelv(MNHN);Nukuhiva,8˚49’S140˚17’W,405-418m,dead, interiorridgescorrespondingtointerspacesbetweenexte-
dredged,N.O.“Alis”,leg.BDR,09.ix.1997(MUSORSTOM9,stnDR riorplicae.
1299),1lv(MNHN). Dimensionsofholotype:H31.1mm,W31.2mm,C8.7
TuamotuArchipelago,Tuamotu,ocean-sideofreef,18˚23’S140˚43’W, mm.
14-16m,dead,leg.M.Marescot,1985,1lv,1rv(ZMA);Niau,16˚10’S Distribution.—SocietyIslands,AustralIslands,Marque-
146˚23’W,490-560m,dead,dredged,leg.P.Bouchetetal.,03.x.2009 sasIslandsandTuamotuArchipelago(FrenchPolynesia),
(TARASOC,stnDW3363),2lv,1rv(MNHN);Kaukura,15˚41’S livingamongstcoralinshallowwateroutsidereefs.
146˚54‘W,390-420m,dead,dredged,leg.P.Bouchetetal.,05.x.2009 Comparison.—Thepresentspecieshasbeenidentified
(TARASOC,stnDW3385),2lv(MNHN). incorrectlyinthepast(Dijkstra,1989:15;Rombouts,1991:
pl.15fig.6;Raines&Poppe,2006:125)asGloripallium
Description.—Shelluptoc.35mmhigh,weaklyinflated, spiniferum(Sowerby1st,1835),alsoknownfromFrenchPoly-
valvesalmostequallyconvex,stronglyinequivalve,nearly nesia.Bothcoral-dwellingspeciesarerareandonlyveryfew
equilateral,circular(immaturespecimens)toslightlyelon- specimenshavebeencollectedalive,probablyduetothe
gate(matureshells),auriclesunequalinshapeandsize,um- habitat.Immaturespecimenscouldeasilybeconfusedwith
bonalanglec.100˚.Colourpaleorangeoryellowishwith otherspecies,especiallysingleimmaturerightvalves.Mi-
reddishmaculationsonleftvalve,rightvalvemoreuniform rapectenboutetorumspec.nov.differsmorphologicallyfrom
reddishoryellowish,exteriorpigmentationnotprominent. G.spiniferum(seeWaller,1978:4,pl.4figs58-63)byhaving6
Leftvalvesculpturedwith7regularlyarrangedradial radialplicaeonbothvalves(G.spiniferumhas7onthelv,8
plicae,whicharewidelyspaced,bearingprominentcurved ontherv),byhavingmorewidelyspacedscalesonthepli- 65
scalesontheircrests(c.5percmoncentralpartofdisc)and caeoftheleftvalve(morecloselysetinG.spiniferum),by
onesmalllateralliraanteriorandposteriortoeachplica;pli- lackingmacrosculptureontheauriclesoftheleftvalveand
calinterspacessmooth,bearingmicroscopic,close-set, ontheposteriorauricleoftherightvalve(radial
weaklydeveloped,commarginallamellaenearventralmar- macrosculptureispresentinG.spiniferum),andbyhaving
gin.Auriclesalsowithmicroscopic,closelyspacedcommar- commarginalmicrosculptureontheauriclesandradialin-
ginallamellae;scalesstronglydevelopedonantero-and terspaces,atleastinthelategrowthstage(radialmi-
postero-dorsalmargins. crosculptureontheplicaeandinterspacesinG.spiniferum).
Rightvalvewith6regularlyarrangedradialplicaeof
dissimilarwidths,bearingprominent,closelyspaced,imbri-
catedscalesontheircrests(c.12percmoncentralpartof (nextpage)
disc,almostcoveringradialinterstices),withtworadiallirae Figs1-12.Mirapectenboutetorumspec.nov.,FrenchPolynesia,SocietyIs-
oneachsideofeachplica,bearingmorewidelysetscales; lands,Tahiti,NNW-coast,Arue,ocean-sideofbarrierreef,17˚30’S,
intersticeseachnarrowerthanoneplica,withsimilarcom- 149˚31’W,60m,alive,dive,2008.1-8,holotype(pr),MNHN23879,
marginalmicrosculpturetothatofleftvalve.Auricleswith height31.1mm,width31.2mm,thicknessofpairedvalves8.7mm;1,
similarcommarginalmicrosculpturetothatofleftvalve, exteriorlv;2,interiorlv;3,exteriorrv;4,interiorrv;5,closeupdorsal
with3-4radialribsonanteriorauricle,bearingstronglyde- arealv;6,closeupdorsalarearv;7,closeuplamellaeventralarealv;8,
velopedscalesonantero-andpostero-dorsalmargins. closeuplamellaeandspinespostero-ventralarearv. 9-12,paratype
Hingelineofleftvalvestraight,ofrightvalveslightly (pr),ZMAMoll.4.11.013,height26.0mm,width26.2mm,thickness7.3
raised;byssalfasciolebroad,byssalgaperathershallow;ac- mm;9,exteriorlv;10,interiorlv;11,exteriorrv;12,interiorrv.
tivectenoliumwith6teeth;auricularcrurawell-developed;
A.GONZÁLEZ-GUILLÉN&A.S.H.BREURE–Bibliographicalnotes
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DIJKSTRA,H.H.–AnewMirapectenspecies
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M.boutetorum M.spiceri M.rastellum G.spiniferum
plicaelv smallerthaninterspaces muchsmallerthaninter- slightlysmallerthaninter- smallerthaninterspaces
spaces spaces
plicaerv broaderthaninterspaces equallysized slightlysmallerthaninter- broaderthaninterspaces
spaces
scaleslv strong,widelysetcurved almostlacking weakwidelysetlamellae strong,closelysetcurved
lamellae lamellae
scalesrv stronglyimbricatedlamellae almostlackingorweakvesic- delicatespinous stronglyimbricatedlamellae
ular
interspaces wideonlv,narrowonrv wideonlv,narroweronrv wideonlv,wideonrv wideonlv,narrowonrv
commarginalsculpture auriclesandinterspaces throughout throughout auriclesandinterspaces
radialsculpture onlyonanteriorauricle presentonbothvalves onanteriorauricle secondarythroughout
colour orange,reddishoryellowish brightlymaculated variegated whitish,orbrightly
maculated
Table1.Comparedmorphologicalcharacters.
Mirapectenboutetorumspec.nov.differsfromM.spiceri(Re- Mirapectenboutetorumspec.nov.differsfromM.rastellum
hder,1944),knownfromtheLineIslands,byhavingbroader (Lamarck,1819),awell-knownIndo-WestPacificspecies
68 plicaeandnarrowerinterspaces(narrowerplicaeandwider (Raines&Poppe,2006:132,pl.81figs1-6,pl.82figs1-6),by
interspacesinM.spiceri),byhavingstronglydevelopped havingstronglydevelopedandcloselyarrangedscaleson
scalesontheplicae(almostlackingorwithsmall,weaknod- theplicaeofbothvalves(almostlackingorweaklydevel-
ulesinM.spiceri),andbylackingdelicateradialsculpture opedandmorewidelyspacedontheleftvalve,anddelicate
onbothvalves(presentinM.spiceri). spinesontherightvalveofM.rastellum),byhavingmore
weaklydevelopedcommarginalmicrosculpture(more
prominentinM.rastellum),andbylackingsecondaryradial
(previouspage) sculptureinthelategrowthstageneartheventralmargin
Figs13-24.GloripalliumandMirapectenspp.13-16,Gloripallium (presentinM.rastellum).
spiniferum(G.B.Sowerby1st,1835),holotype(pr),NHMUK(formerly MirapectenyaroniDijkstra&Knudsen,1998,knownfrom
BMNH)1950.11.14.69,LordHoodIsland(nowMarutea),TuamotuAr- theRedSea,ismuchlarger(uptoc.70mminheight)than
chipelago,height22.9mm,width22.6mm;13,exteriorlv;14,interior thepresentspecies(uptoc.35mm)andhasonlysmall
lv;15,exteriorrv;16,interiorrv.17-20.Mirapectenspiceri(Rehder,1944), scalesontheradialplicaeoftherightvalve(stronglydevel-
CentralPacific,LineIslands,ChristmasIsland,1˚55’N,157˚20’W; 17-18, oped,large,imbricatedlamellaeonthepresentspecies).
holotype(rv),USNM518010,height39.8mm,width37.9mm;17,exte- Etymology.—NamedafterMrMichelBoutetandMrs
riorrv;18,interiorrv;19-20,paratype(lv),USNM518011,height35.2 HélèneBoutet(Papara,Tahiti,FrenchPolynesia).
mm,width32.2mm;19,exteriorlv;20,interiorlv.21-24,Mirapecten
rastellum(Lamarck,1819),holotype(pr),MHNG1088/24,“Lesmersdu Acknowledgements
nord”(incorrecttypelocality),height32.5mm,width34.5mm;21,exte-
riorrv;22,exteriorlv;23,interiorrv;24,interiorlv. IammuchindebtedtoDrPhilippeBouchet(MNHN)for
providingimportantpectinidmaterialforstudy.Iamalso
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gratefultoDrAlanBeu(GNS),whokindlycorrectedthe valvia:Propeamussiidae,Pectinidae)oftheRedSea.—Molluscan
textandgaveconstructivesuggestions..Thanksarealsodue Research19:43-104.
toMessrs.MichelBoutetandJeanLetourneux(Tahiti, Hayami,I.,1989.OutlookonthePost-Paleozoichistoricalbiogeography
FrenchPolynesia)forsupplyingimagesandMrMichel of pectinidsinthewesternPacificregion.In:Ohba,H.,Hayami,I.
Boutetfordonatingmaterialofthenewspecies.Forphoto- &Mochizuki,K.,eds,CurrentaspectsofbiogeographyinWestPa-
graphsIwishtothankDrEllenE.Strong(NMNH),Ms cificandEastAsianregions.—TheUniversityMuseum,TheUni-
KathieWayandMrPhilHurst(NHMUK),MrHenkDekker versityofTokyo,NatureandCulture,No.1:1-25[reprinted].
(Winkel,TheNetherlands),andformountingtheplatesDr Hertlein,L.G.,1969.FamilyPectinidaeRafinesque,1815.In:Moore,
BasKokshoorn(NCBNaturalis).IfinallythankMessrs. R.C.,ed.,TreatiseonInvertebratePaleontology,PartN,1,Mollusca
PhilippeMaestrati(MNHN)andRobertG.Moolenbeek 6,Bivalvia:N348-N373.Lawrence.
(ZMA)forassistanceinvariousways. Raines,B.K.&Poppe,G.T.,2006.Aconchologicaliconography.Thefam-
ilyPectinidae:1-402,pls1-320.Hackenheim.
Rehder,H.A.,1944.AnewpectinidshellfromthePacificOcean,witha
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DIJKSTRA,H.H.–AnewMirapectenspecies