An Iberian surprise, Henkia mariannae gen. & spec. nov. and H. antoni gen. & spec. nov. (Gastropoda, Pulmonata, Hygromiidae)

2012·0.31 MB·English

by  Gittenberger, E

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An Iberian surprise,
Henkia mariannae gen. & spec. nov.
and H. antoni gen. & spec. nov.
(Gastropoda, Pulmonata, Hygromiidae)
E. Gittenberger
NetherlandsCentreforBiodiversityNaturalis,P.O.Box9517,NL-2300RALeiden,TheNetherlands;[email protected]
Systematicpart
AnewgenusofsmallHygromiidaeisdescribed,Henkia,
withtwonewspecies,viz.H.mariannaegen.&spec.nov. FamilyHygromiidaeTryon,1866
(typespecies)andH.antonigen.&spec.nov.,bothfromthe
southernIberianpeninsula.Shellshapeandsculptureare Henkiagen.nov.
notunique,butareonlyknownfromspeciesthatdiffersub- Typespecies:Henkiamariannaespec.nov.
stantiallyingenitaltract. Additionalspecies:Henkiaantonispec.nov.
71
Keywords:Gastropoda,Hygromiidae,taxonomy,Portugal,Spain. Derivationominis.–AfterIr.HenkP.M.G.Menkhorst,
whodiscoveredH.mariannaesomedecadesago.
Introduction Description.–Shell(Figs1-4,7)withaconspicuouslyflat-
tenedspirebecausetheinitialwhorlsarenotturningdown.
Over30yearsago,twoenigmaticspeciesofsmallHygromi- Protoconchwithelongatedscale-like,curvedoutgrowths,
idae,withhairyshells,werediscoveredinthesouthernpart withtipstouchingtheshellsurfaceagain.Teleoconch
oftheIberianpeninsulabutremainedundescribedtillnow. denselysculpturedwithrathercoarse,irregulargrowth-
TheiroccurrencewasreconfirmedbyseveralDutchmalacol- lines,longtoverylonghairs,andirregular,spirally
ogists,butonlyoncesomelivespecimensofoneofthe arranged,fineperiostracalcrests.
specieswerefound.Thestructureofthegenitaltractturned Anatomy(Figs5,6),afterH.mariannaeonly.–Twospeci-
outtodiffersubstantiallyfromthatofotherhygromiids,so mensweredissected,andtransparentgenitalslides(Fig.5)
thatanewgenusshouldbeintroduced. weremade.Therightommatophoranretractorrunsnextto
Aslongasonlyspecimensofonespeciescouldbedis- thegenitalia.Theconnectionofthepenialnervetothegan-
sected,thegenericcharacteristicsremainsomewhatuncertain. gliacouldnotbetracedwithcertainty.Thepenisisaboutas
Forcollections,thefollowingabbreviationsareused: longasthegraduallytaperingflagellumandhalfaslongas
HM,H.P.M.G.Menkhorst(KrimpenaandeIJssel)(in theepiphallus.Itsproximalpart(closesttothebodywall
RMNH);JE,J.C.A.Eikenboom(Hellevoetsluis);RB,R.W.B. fromwhichitdevelopsasaprotrusion)isslightlylonger
Bruins(NieuwLoosdrecht);RMNH,NetherlandsCentrefor thanthedistalpartandsomewhatbroaderasaconsequence
BiodiversityNaturalis(Leiden). ofthepresenceofaprominentpenialpapilla.Wherethere-
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Figs1,2.Henkiaspec.1,H.mariannaespec.nov.,holotype(RMNH
260563),Portugal,Faro(Algarve),rockyslope1kmNofLagosalong
roadN125[UTMNB20],H.P.M.G.Menkhorstleg.1.viii.1980,actual
width4.0mm.2,H.antonispec.nov.,holotype(RMNH260565),Spain,
provinceofMalaga,Alozaina[UF36],nearCoin,amonghumusonig-
neousrocks,H.P.M.G.Menkhorstleg.8.iv.1980,actualwidth3.6mm.
PhotosbyD.Groenenberg.
tractormuscleinserts,thedistalparthasastronglythick-
enedwall,probablyconsistingofglandulartissue,whichis
lackingelsewhereinthemalepartofthegenitalia(maybe
thereisanadditional,verythin,separatesurfacelayer,but
thatcouldnotbeascertained);moreproximally,thepenial
wallisrelativelythinandbordersacavityaroundthebase
72 ofthepenialpapilla.Whatseemstobeasimple,bluntpe-
nialpapillainthepenisproximalisatfirstsight,isinfacta
sheathcoveringthetruepapilla.Atitstip,thepenialpapilla
isconnectedtoitssheath.Thevaginaisstronglyinflated, Fig.5.GenitaltractofHenkiamariannaefromthetypelocality,coloured
bell-shaped;itsdart-saccomplex,consistingoftwogroups withcochinealdyeinethanol70%,clearedinEuparalessenceandfixed
ofadart-sacandanaccessorysac(usedhereasaneutral inEuparal.A,glandulaalbuminifera;B,bursaofbursacopulatrix;BC,
pedunculusofbursacopulatrix;D,dart-saccomplex;E,epiphallus;F,
flagellum;G,digitiformgland;GA,genitalatrium;O,oviduct;P,penis;
R,retractorpenis;V,vagina;VD,vasdeferens.
term,withoutdevelopmentalorphylogeneticimplications),
insertsnearitsproximalend.Thesimpledartsareslightly
curved.Insidethevaginatherearesomethicklongitudinal
ridges.Thedigitiformglandsinsertintwogroupsoftwo,
oppositeeachothernearthedistalendofthevagina;their
connectiontothelumenseemstobemoreproximally.
Oviduct,vaginaandpenisareaboutequalinlength.The
bursacopulatrixhasaprominentpedunculusandalarge
Figs3,4.ProtoconchsofHenkiaspec.fromtypelocalities.3,H.marian- bursawithavagueprotrusionatoneside.Thegenital
nae;4,H.antoni.SEMphotosbyL.vanOfwegen. atriumisnearlyaslongasthepenisandaboutasbroadas
theoviduct.
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minuteornotdiscernibleonoutsideinspection;inX.apicina
thevaginaisstronglyinflatedtowardsthegenitalatrium
andnarrowwheretheoviductstarts.Acombinationofspi-
ralstriae,hairsandfine,periostracal,spirallyarranged
crestshasalsobeendescribedandillustratedforPlentuisa
vendiaPuente&Prieto,1992,byPuente&Prieto(1992:fig.
14)andforMontserratinabofilliana(Fagot,1884)byGiusti&
Manganelli(1988:pl.1figsB-G).Eventhepenialpapillain
Fig.6.Centraltoothandlateralteeth1-12ofHenkiamariannaefromthe HenkiarecallsthepapilladescribedforMontserratinaby
typelocality. Giusti&Manganelli(1988:fig.2A,B),butthatiswherethe
similarityends,sincethelattergenusandPlentuisaPuente&
Ureter.–Theureteropenshalfwaythetipofthekidney Prieto,1992,differclearlyinothercharactersofthegenital
andtheborderofthemantle. tract,asforexamplebytheabsenceofadart-saccomplex.
Mantleborder.–Onlyarightlaterallobe,taperingfrom ThephylogeneticrelationshipsofHenkiacanbedis-
lefttoright,isclearlydiscernible.Theleftlaterallobemay cussedmorefruitfullywhenmoleculardataareavailable.
berecognizednearthepneumostome;moredownwardsit
passesgraduallyintothemantleborder. Henkiamariannaespec.nov.(Figs1,3,5,6)
Radula(Fig.6).–Inahalfrow,inonespecimen,thereare
17bicuspidteethnexttothetricuspidcentraltooth.Thecen- Material,shells(holotypeandparatypes).–Portugal,Faro(Algarve):
traltoothisaslargeastheadjoiningteeth;itssidecuspsare rockyslope1kmNofLagosalongroadN125[UTMNB20],H.P.M.G.
smallerthanthoseoftheotherteeth.Aftertheseventhtooth Menkhorstleg.1.viii.1980(holotype,RMNH260563;RMNH260564/5;
inahalfrow,thesidecuspsmaybeslightlyserrated. HM/45&18);1kmNEofLagos,alongN125directionPortimaoH.P.M.G. 73
Differentiation.–Theshellsarestrikinglysimilarto Menkhorstleg.5.viii.1980(HM/5);3kmNofSagres[NA09],H.P.M.G.
thoseofspeciesofSchileykiellaManganelli,Sparacio& Menkhorstleg.5.viii.1980(HM/9);3kmNEofBurgau[NB20],H.P.M.G.
Giusti,1989,especiallyinthesculptureoftheteleoconch. Menkhorstleg.29.xii.1985(HM/6);1kmEofAlmedena,10kmWof
ThetypespeciesofSchileykiella,S.parlatoris(Bivona,1839), Lagos[NB10],H.P.M.G.Menkhorstleg.(HM/1);2kmNEBoliqueime
andS.bodoniCianfanelli,Manganelli&Giusti,2004,are [NB71],J.Eikenboomleg.6.vi.2007(JE/15);rockyslopeSEofBensafrim
evenmoresimilarbytheflattenedspireoftheshells.The [NB21],J.Eikenboomleg.v.2001(JE/1),B.Bruinsleg.19.v.2011(RB/3).
genitaltractofSchileykiellaisverydifferenthowever,sincea
dart-saccomplexislackingandthepenialstructureiscom- Shell.–Shellpaleyellowishbrown,withuptofourcon-
pletelydifferent;seeManganellietal.(1989)andCianfanelli vexwhorls;theinitialc.twowhorlshardlydescend,result-
etal.(2004)forfurtherdetails.HelicotrichaGiusti,Man- inginaflattenedspire,contrastingwiththeadjoining,
ganelli&Crisci,1992,hasasimilardart-saccomplex,butthe increasinglyprominentlydescendingwhorls.Umbilicus
vaginaisnotinflated,glandulartissueispresentonthe open,measuring1/5-1/7oftheshellwidth.Teleoconchwith
proximalendofthepenisandinthelumennexttothequite periostracalhairsmeasuring0.2-0.4mm.Proto-andteleo-
differentpenialpapilla,whichhasaT-shapedpilasterand conchwithveryfine,incisedspiralstriae.Protoconchwith
nosheath.Theshellhasveryshorthairsandlacksthepe- scattered‘scales’.Heightupto2.8mm;widthupto4.0mm.
riostracalcrests.InXerotrichaMonterosata,1982,X.apicina Differentiation.–SeesubH.antonispec.nov.
inparticularrecallsHenkiabythepresenceoflonghairsand Genitalslides(RMNH,Mollusca1155a,b),paratypes,
longitudinalcrestsontheshell(Giusti&Manganelli,1989: fromtypelocality,H.P.M.G.Menkhorstleg.1.viii.1980.
pl.6fig.E),butthepenisdistalisandthepenialpapilladif- Note.–ThespeciesisnotshowninLocard’s(1899)often
fer,whereastheaccessorysacsofthedart-saccomplexare neglectedmonograph.
Gittenberger,E.–AnIberiansurprise
B76-Gittenberger:Basteria-2010 12/07/2012 16:27 Page 74
moreirregular,andtheprotoconchlacksclearspiralstriae.
Derivationominis.–Namedaftermycolleague
DrAntonJ.deWinter,oneofthediscoverersofthisspecies.
Acknowledgements
IcordiallythankMessrsR.[Bob]W.B.Bruins,JoopC.A.
Eikenboom,andHenkP.M.G.Menkhorst,whoprovidedthe
materialdealtwithinthisarticle.Thanksarealsodueto
DickGroenenbergandBasKokshoorn,forproducingand
processingthephotographs,toLeenvanOfwegen,who
madetheSEMphotographs,andtoMsMarjoleinRensing
fortechnicalassistanceinpreparingfigure5.
Fig.7.Henkiaantonispec.nov.,juvenileparatypeRMNH260566with References
2¾whorls,ElChorro[UF48],38kmNWMalaga,500-700malt.,lime-
stone,A.J.deWinterleg.28.xii.1982,actualwidth2.6mm. Cianfanelli,S.,Manganelli,G.&Giusti,F.,2004.AnewspeciesofSchi-
leykiellafromMarettimo(Aegadianislands,Italy)anddiscussionof
Derivationominis.–NamedtohonourMarianC.Slooff, relationshipsofciliellinehygromiids(Gastropoda,Pulmonata,Hy-
theindispensablecompanionofHenkP.M.G.Menkhorst gromiidae).–JournalofConchology38:209-230.
duringmanycollectingtrips. Giusti,F.&Manganelli,G.,1988.Notulaemalacologicae,XL.
74 MontserratinaOrtizdeZárateLópez,1946(Pulmonata,Hygromi-
Henkiaantonispec.nov.(Figs2,4,7) idae):aredescription.–Iberus8:89-100.
Giusti,F.&Manganelli,G.,1989.Notulaemalacologicae,XLIV.Anew
Material,shells(holotypeandparatypes).–Spain,provinceofMalaga: HygromiidaefromtheTyrrhenianislandsofCapraiaandSardinia
Alozaina[UTMUF36],nearCoin,amonghumusonigneousrocks, withnotesonthegeneraXeromicraandXerotricha(Pulmonata:Heli-
H.P.M.G.Menkhorstleg.8.iv.1980,1(holotype,RMNH260565;HM/3); coidea)(StudiesontheSardinianandCorsicanmalacofauna,
ElChorro[UF48],38kmNWMalaga,500-700malt.,limestone,A.J.de VIII).—BollettinoMalacologico25:23-62.
Winterleg.28.xii.1982(RMNH260566/11). Giusti,F.,Manganelli,G.&Crisci,J.V.,1992.AnewproblematicalHy-
gromiidaefromtheAeolianislands(Italy)(Pulmonata:Helicoidea).
Shell.–Shellyellowishbrown,withupto3½whorls,most –Malacologia34:107-128.
ofwhicharecoiledinthesameplanesinceonlythefinal Locard,A.,1899.Conchyliologieportugaise.Coquillesterrestres,des
halfofthelastwhorlturnsdown;withabroadlyrounded eauxdoucesetsaumatres.–ArchivesduMuseumd’HistoireNa-
shoulder.Umbilicuswide,measuringc.¼oftheshellwidth. turelledeLyon7:i-iv,1-303.
Protoconchwithmanyprominent‘scales’,withoutclearspi- Manganelli,G.,Sparacio,I.&Giusti,F.,1989.Newdataonthesystem-
ralstriae.Teleoconchwithperiostracalhairs,measuring0.3- aticsoftwoSicilianlandsnails,HelixparlatorisBivona,1839and
0.4mm.Heightupto1.6mm;widthupto3.6mm. HelixreinaeL.Pfeiffer,1856anddescriptionofSchileykiellan.gen.
Anatomy.–Unknown. (Pulmonata:Hygromiidae).–JournalofConchology33:141-156.
Differentiation.–HenkiaantonidiffersfromH.mariannae Puente,A.I.&Prieto,C.E.,1992.Plentuisavendia,anewgenusand
mostclearlybyitssmaller,nearlyentirelyflattenedshells,with speciesfromthePicosdeEuropa(northoftheIberianPeninsula)
amorewidelyopenumbilicus.Onaverage,theteleoconch (Gastropoda:Helicoidea:Hygromiidae).–JournalofConchology
hairsareslightlylonger,thespirallyarrangedcrestsareeven 34:159-168.
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