A new species of recent scallop of the genus Serratovola (Bivalvia, Pectinidae) from the tropical Indo-West Pacific

2008·30.6 MB·English

by  Dijkstra, Henk H

BASTERIA,72:57-63,2008
AnewspeciesofrecentscallopofthegenusSerratovola(Bivalvia,Pectinidae)
fromthetropicalIndo-WestPacific
HenkH.DIJKSTRA
ZoologicalMuseumAmsterdam,UniversityofAmsterdam,Mauritskade61,
1092ADAmsterdam,TheNetherlands;[email protected]
ThepresentpaperdealswithSerratovolaangusticostataspec.nov.,aspeciesthathasoftenbeen
erroneouslyidentifiedasadescribedSerratovolaintheliterature.
Keywords:Bivalvia,Pectinidae, Serratovola,tropicalIndo-WestPacific.
INTRODUCTION
DuringseveralvisitstothemajornaturalhistorymuseumsinEuropeandAustraliaI
had the opportunity to examine the specimens and type material of the pectinid genus
Serratovola Habe,1951. Whiledoing so, anerroneously determined,undescribed species
turned up. For comparison with congeners, the primary types of the Serratovolaspecies
arefiguredherein.
Acronyms for collections: BMNH, The Natural History Museum, London; KBIN,
Koninklijk Belgisch Instituut voor Natuurwetenchappen, Brussels; NNM, Nationaal
Natuurhistorisch Museum ‘Naturalis’, Leiden; SNSD, Staatliche Naturhistorische
Sammlungen Dresden; ZMA, Zoological Museum Amsterdam. Abbreviations for shell
characters:C,convexityofbotharticulatedvalves;h,height(dorsal-ventral);lv,leftvalve
(uppervalve);rv,rightvalve(lowervalve);w,width(anterior-posterior).
The typeseries ofthe newspecies contains articulatedspecimenswithoutsoft parts
only. This material is preserved in the type collection of the Zoological Museum,
Amsterdam.
SYSTEMATICPART
FamilyPectinidaeRafinesque,1815
SubfamilyPectininaeRafinesque,1815
TribePectininiRafinesque,1815
SerratovolaHabe,1951
Serratovola Habe, 1951: 81 [in Japanese]. Type species (original designation): Pecten tricarinatus
Anton,1838(notDefrance,1825)[=PectenrubicundusRécluz,inChenu,1843,nomennovum].China.
StudiedtypematerialofSerratovolaspecies.—PectentricarinatusAnton,1838:19;China.Lectotype
SMTD6937,designatedbyDijkstra(1998:29).Not PectentricarinatusDefrance,1825.
PectenasperG.B.SowerbyII,1842:50,pl.19figs196,197(notG.B.SowerbyII,inReeve,1842:161,
pl.114fig.6,juniorhomonym);“NewGuinea”,leg.MrHinds.SevenpossiblesyntypesBMNH20080065.
Pectenrubicundus RécluzinChenu,1843:3,pl.7figs4,5(nomennovumforPectenasperSowerby,
notLamarck,1819).
PectenpasserinusHinds,1845:61(alsoareplacementnameforPectenasperSowerby,notofLamarck,
58 BASTERIA,Vol.72,No.1-3,2008
Figures1-6.JaniragardineriSmith,1903,MaldiveIslands,holotypeBMNH1903.9.17.48,spm(22.6x24.9
mm);1,lv,exterior;2,lv,interior;3,rv,exterior;4,rv,interior;5,lv,exterior,detailcentralpartofdisc;6,
rv, exterior, detail central part of disc. Figures 7-12. Serratovola angusticostata spec. nov., Philippine
Islands,Cebu,MactanIsland,PuntaEngano,10.31667N,124.0167E,80-150m,alive,'tangle-net'fishing,
1981,holotypeZMAMoll. 4.08.014,spm(34.7x37.1mm); 7,lv,exterior;8,lv,interior; 9,rv,exterior;
10,rv,interior; 11,lv,exterior,detailcentralpartofdisc;12,rv,exterior,centralpartofdisc.
Dijkstra:AnewspeciesofSerratovola 59
Figures 13-18.PectenasperSowerbyII,1842,NewGuinea,largestpossiblesyntypeBMNH20080065,
spm(32.2x35.4mm);13,lv,exterior;14,lv,interior;15,rv,exterior;16,rv,interior;17,lv,exterior,detail
centralpartofdisc;18,rv,exterior,detailcentralpartofdisc.Figures19-24.PectentricarinatusAnton,
1839,China,lectotypeSMTD6937,spm(28.8x31.1mm);19,lv,exterior;20,lv,interior;21,rv,exterior;
22,rv,interior;23,lv,exterior,detailcentralpartofdisc;24,rv,exterior,centralpartofdisc.
60 BASTERIA,Vol.72,No.1-3,2008
1819).SeealsoArkel(1954).
JaniragardineriE.A.Smith,1903:622,pl.36,figs21,22;MaldiveIslands,SNilanduAtollandFelidu
Atoll,1-36fathoms(=1.8-65.8m).HolotypeBMNH1903.9.17.48,2paratypesBMNH1903.9.17.45-46.
SerratovolapallulaDijkstra,1998:28,pl.4figs1-6;PapuaNewGuinea,HansaBay,SofDuangit,60
m,dredged,leg.B.Tursch.HolotypeKBIN25.955.471.
Diagnosis. —Freeliving Pectininiwith anearlyflattosomewhatconcaveleftvalve
and a convex right valve; sub(circular), inequivalve, slightly inequilateral, auricles
unequal inshapeandnearly equalinsize, radialmacrosculpture ofsolidorhollowseg-
mentedribs, byssalnotch andctenoliumrudimentary inlate ontogeny.Internalribcari-
naepresent,lackingintermediatedorsalteeth.
S.angusticostata S.gardineri S.rubicunda S.pallula
shapelv slightly inflated flattened slightlyinflated slightlycon-
inearlyontogeny cave
ribslv small medium medium broad
intersticeslv broad medium medium narrowinlate
growthstage
ribsrv angular angular roundedinlate angular
growthstage
microsculpturelv antimarginalin commarginal commarginal commarginal
interstices
colour red-brownwith palecreamy creamywithred red-brown
dotsininterstices withredspots /creamyspots withreddots
Table1.MorphologicalcharactersofSerratovolaspecies.
Remarks.—Habe(1951)introducedSerratovolaasavalidgenus,butHertlein (1969)
considered itasynonymofPecten.Serratovolaspecies,however,differfrom Pecten bythe
subequalauriclesandthehollowsectionsintheradialcostae.
RecentspeciesofSerratovola are: Serratovolarubicunda(Récluz,inChenu,1843) from
the tropical Indo-West Pacific, Serratovola gardineri (E.A. Smith, 1903) from the Maldive
archipelago, Serratovola pallula Dijkstra, 1998, from Papua New Guinea and northern
Australia,andSerratovolaangusticostataspec.nov.fromthetropicalIndo-WestPacific.All
arelivingsublittorallyandbathyallyonmudormuddysand.
Serratovolaangusticostata spec.nov.(figs.....)
Serratovola tricarinata (Anton, 1839 [sic]); Abbott & Dance, 1982: 304, ill. (not Pecten tricarinatus
Anton,1838);Springsteen&Leobrera,1986:326,pl.93fig.3(notAnton).
Pecten(Serratovola)tricarinatusAnton,1839[sic];Rombouts,1991:55,pl.20fig.7(notAnton).
Serratovola gardineri(Smith, 1903);Dijkstra, 1991:49 (pro parte); Dijkstra,1994: 14, figs; Okutani,
2000:909,pl.452fig.52(notJaniragardineriSmith,1903).
Holotypeandparatypes.— PhilippineIslands,Cebu,MactanIsland,PuntaEngano,10.31667N,
124.0167 E, 80-150 m, alive, ‘tangle-net’ fishing, 1981 (ZMA Moll. 4.08.014, holotype; ZMA Moll.
4.08.015/8).PuntaEngano,10.31667N,124.0167E,110-150m,alive,‘tangle-net’fishing,1982(ZMAMoll.
4.08.016/2).Luzon,ManilaBay,offPortofManila,14.51917N,120.7700E,150-180m,alive,trawledby
Dijkstra:AnewspeciesofSerratovola 61
localfishing-boat,1982(ZMAMoll.4.08.017/4).ManilaBay,offPortofManila,14.5N,120.7667E,45-65
m,alive,trawledbylocalfishing-boat,1982(ZMAMoll.4.08.018/2).Taiwan,S-coast,offT’ainan,22.81667
N,120.1E,70-100m,alive,trawledbylocalfishing-boats,1973(ZMAMoll.146001/6).S-coast,offT’ainan,
22.8488N,120.0909E,60-80m,alive,trawledbylocalfishing-boat,1980(ZMAMoll.140030/1).Thailand,
Kantang,LibongIsland,7.25N,99.3833E,40-60m,aliveonmuddysand,localfishing-boat,1986(ZMA
Moll.143671/3).Ranong,offRanong,9.75N,98.6667E,30-60m,aliveonasandybottom,1990(ZMA
Moll.142292/1).Phuket,KoRayaNoi,11.95N,102.4167E,25-30m,aliveonmuddysand,compressor
divebylocalfishermen,1993(ZMAMoll.145487/3).Indonesia,MakassarStrait,-1.13S,117.3117E,49
m, alive, 30 October 1980, “Corindon-Makassar” Expedition, stn CH 205 (ex MNHN, ZMA Moll.
142294/3).KalimantanTengah,offMatua(Matuwa),-3.0321S,110.7678E,55m,aliveonmuddysandand
rubble,localfishing-boat,1992(ZMAMoll.143712/1).PapuaNewGuinea,HansaBay,-4.1667S,144.8833
E,50m,aliveonmuddysand,dredged,leg.B.Tursch(ZMAMoll.146352/1).
Description. — Shell up to ca. 35 mm high, circular, inequivalve, equilateral. Left
valveflatorslightlyinflated;rightvalveconvex.Auriclesnearlyequalinsize,unequalin
shape. Umbonal angle ca. 115°. Left valve creamy red-brownish with commarginal
brownishmaculationsandbrownishradialstreak ontheribs;right valveoff-whitewith
minute red-brownish dots near the umbo, inside whitish with large brown dot near
adductorscar.
Left valve sculptured with 18, regularly spaced, narrow angular radial costae with
hollowsectionslaterally,separatedbyasolidcentralradialkeel.Theinterspaces(2.5mm)
arebroaderthantheradialribs(1.5mm)nearthecentralpartoftheventralmargin.The
anterior (11.9 mm) and posterior(11 mm) hingeof the auricles are nearly equalin size.
Theanteriorauricleisslightlysmallerthantheposteriorone(antero-margin7mm,pos-
tero-margin9mm);bothauricleshaveafewveryweakradialridges(2anterior,3poste-
rior) and a closely spaced commarginal lamellar sculpture near the disc of the anterior
auricle.Antimarginalmicrosculptureispresentintheintercostalspaces.
Rightvalvewith19,regularlyspaced,angularradialribswithatripartiteappearance
by‘dentrition’,alsowithhollowsectionslaterallyandseparatedbyasolidcentralradial
keel.Interspaces(1.5mm)somewhatnarrowerthantheradialcostae(2mm)neartheven-
tralmarginwithclosely spaced(7-8permm)commarginallamellae.Anteriorandposte-
riorauricleswith3-4veryweakradialridges.Byssalnotchshallow.Functionalctenolium
lacking.
Measurementsofthetypematerial.—Holotype:H34.7mm,W37.1mm,C10.4mm.
Paratypes:height14.6-32.4mm.
Distribution. — Tropical Indo-West Pacific: Taiwan, Philippines, Indonesia, west-
wardstoThailandandeastwardstoPapuaNewGuinea.Depthrange30-150m,livingon
softbottomassemblages.
Comparison.—Serratovolaangusticostata ismorphologicallyclose to S.gardineri,but
the present species has aslightly more inflated left valvewhen juvenile. Serratovola gar-
dineri is flat and differs in having smaller radial costae and wider intercostal spaces on
both valves;ithas broad ribs and narrow interspaces. The commarginal microsculpture
ontheleftvalveofS.angusticostataisonlypresentontheanteriorauriclenearthediscand
throughouttheleftvalvein S.gardineri.Anantimarginalmicrosculptureispresentinthe
interspaces ofthe left valveof S.angusticostata, and acommarginalmicrosculpture inS.
gardineri.Moreover,thegroundcolouroftheleftvalveofS.angusticostataisreddishbrown
with minutebrownishcommarginaldots,versuscreamy withredscatteredmarkingsin
S.gardineri.TheinternalcolourofS.angusticostataiswhitishwithalargebrownspot,and
uniformwhitein S.gardineri.
Serratovola angusticostata differs from the sympatric S. rubicunda in having slightly
62 BASTERIA,Vol.72,No.1-3,2008
smaller radial costae, with broader hollow sections laterally and a smaller central keel.
Serratovolarubicundahaswider,moreflat-toppedribsandsmallerhollowsectionslateral-
lyandabroadercentralkeel.Serratovolaangusticostatahasacommarginalsculptureonthe
anteriorauricleoftheleftvalveandS.rubicundahasaprominentcommarginalsculpture
throughoutonribs,intersticesandauricles. Theradial ridgesonthe auricles areweaker
andlessnumerousinS.angusticostata(anterior2,posterior3)versusS.rubicunda(anteri-
or5,posterior6).Moreover,theribsoftherightvalvearesolidandrounded,withadel-
icateorwithoutacommarginalsculptureintheintersticesinlategrowthstageofS.angus-
ticostata,andangularwithhollowsectionsandaprominentcommarginalsculptureinthe
interstices of S. rubicunda. The groundcolour of S. angusticostata is red-brownish and
creamy, and creamy in S. rubicunda. Serratovola angusticostata has minute dots in early
growthstage,versusscatteredprominentdotsonbothvalvesinS.rubicunda.Theinternal
colourofS.angusticostata iswhitishoryellowishwhitewithalargebrownspotandwhite
throughoutinS.rubicunda.
Serratovolaangusticostataisclearlylargerthan S.pallula,measuringca.35mmversus
ca.17mm inheight.TheleftvalveofS.angusticostata isslightlyinflatedinearly growth
stage,whereasthatofS.pallulaisslightlyconcave.Serratovolaangusticostatahassmallribs
and wide interstices, and S. pallula broad ribs, lacking the intercostal spaces in early
growth stage and very narrow interstices when fully grown. The microsculpture of the
leftvalveofS.angusticostata iscommarginal,partlyonthe anteriorauricle and antimar-
ginalin interstices,whereas fullygrown S.pallulahasacommarginal microsculptureon
bothauriclesandinterstices.Serratovolaangusticostatahascommarginaldotsinintercostal
spaces and brown streak on keel, whereas S. pallulahas morescattered dots on the ribs
andinterstices.
Etymology.—Withsmallribs(Latin, adj.),alludingtotheradialmacrosculpture on
bothvalves.
ACKNOWLEDGEMENTS
I am most grateful to the colleagues Dr K. Schniebs (SNSD), Dr J. Van Goethem
(KBIN) and Ms K. Way (BMNH) for makingthe type material of the Serratovola species
availableforstudy.ManythanksarealsoduetoMrJ.Goud(NNM-Naturalis)fortechni-
calassistanceinpreparingcolourphotographsandplates.
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