Table 1. Number of known extant species of the family Velutinidae, according to MolluscaBase (2022)SubfamilyGenusNumberof speciesLamellariinaeCalyptoconcha Bouchet &1d’Orbigny, 1841Warén, 1993Coriocella Blainville,81824Hainotis F. Riedel, 20001Lamellaria Montagu,241816Mysticoncha J. K. Allan,21936Pseudosacculus Hirase,11928Velutininae Gray,CartilagoƲelutina Golikov31840& Gulbin, 1990CiliatoƲelutina Golikov &4Gulbin, 1990Cilifera Golikov &1Gulbin, 1990Limneria H. Adams & A.3Adams, 1851Marsenina Gray, 18507Marseniopsis Bergh, 18869Onchidiopsis Bergh, 185317Piliscus Lovén, 18593Pseudotorellia Warén,11989Velutina J. Fleming, 182010Not assignedLamellariopsis Vayssière,21906Marseniella Bergh, 18861TorelliƲelutina J. H. Mc-1Lean, 2000Total99

Table 1. Number of known extant species of the family Velutinidae, according to MolluscaBase (2022)SubfamilyGenusNumberof speciesLamellariinaeCalyptoconcha Bouchet &1d’Orbigny, 1841Warén, 1993Coriocella Blainville,81824Hainotis F. Riedel, 20001Lamellaria Montagu,241816Mysticoncha J. K. Allan,21936Pseudosacculus Hirase,11928Velutininae Gray,CartilagoƲelutina Golikov31840& Gulbin, 1990CiliatoƲelutina Golikov &4Gulbin, 1990Cilifera Golikov &1Gulbin, 1990Limneria H. Adams & A.3Adams, 1851Marsenina Gray, 18507Marseniopsis Bergh, 18869Onchidiopsis Bergh, 185317Piliscus Lovén, 18593Pseudotorellia Warén,11989Velutina J. Fleming, 182010Not assignedLamellariopsis Vayssière,21906Marseniella Bergh, 18861TorelliƲelutina J. H. Mc-1Lean, 2000Total99

Table 2. Synopsis of the most useful characters and information for diagnosis of subfamilies and generaCharacterMarseniopsinaeHainotinaeVelutininaeLamellariinaeCalyptoconchaVariolipalliumPacificaDjiboutiaCoriocellaLamellariaMarseniaMarseniellaExternal morphologyShapeFlat or domeDome shaped;Flat orFlat or domeFlat or domeFlat or domeFlat orFlat orDomeFlat orFlat orFlat; outlineshaped; outlineoutlinedomeshaped; out-shaped; out-shaped; out-domedomeshaped;dome shaped;domeroundedrounded or pol-rounded orshaped;line roundedline roundedline roundedshaped;shaped;outlineoutlineshaped;ygonalpolygonaloutlineor polygonalor polygonaloutlineoutlinerounded,roundedoutlineroundedroundedroundedtwo to sixroundedwartsSize (cm)0.5–11.50.5–5.00.5–11.00.5–10.01–40.5–3.00.5–1.00.5-3.31.5–8.50.3–1.10.3–102.2MantleFused orFusedFused orFused orFusedFused orFusedFusedFusedFusedFused orFuseddorsal fissurenot fuseddorsal fissuredorsal fissuredorsal fis-sureShellShapeEar shapedEar shapedEar, shieldEar shapedEar shapedEar shapedEarEar shapedEar shapedEar shapedEar shapedEar shaped,or capshapedlast whorlshapeddetachedfrom spireSpireHighHighLow orLow or highHighHighLowLowLowLowLow orLowhighhighThicknessVery thinThin or veryModeratelyThin or veryVery thinVery thinVery thinThin or veryThinThinThinThinthinthin orthinthinthinTextureWeak to mem-WeakStrong toStrong toWeak to mem-Weak to mem-WeakWeakStrong toWeakWeakMembran-branaceousweakmembranaceusbranaceousbranaceousmoderateaceousPeriostracumThin to not vis-Thin to mod-ModeratelyThin to not vis-Not visibleNot visibleNot visibleNot visibleThinNot visibleNot visible?ibleeratelyor wellibledeveloped,developed,hairyoccasion-ally hairyNucleousWith or without?With orSubsuturalSmoothSubsuturalSubsuturalSubsuturalSubsuturalSubsuturalSubsutural?granular sculp-withoutaxial foldsaxial foldsaxial foldsaxial foldsaxial foldsaxial foldsaxial foldsturegranularsculptureRadulaFormula2:1:1:1:22:1:1:1:22:1:1:1:20:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:0RachidianElongated.BaseElongated.Squared.Elongated.Elong-Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.rectangular.Base rect-BaseBase withated.BaseBase bifur-Base bi-Base bifur-Base bi-Base bifur-Base bi-Base bi-Cusp, three toangular.broad.or withoutsquared.cated.Cusp,furcated.cated.Cuspfurcated.cated.Cusp,furcated.furcated.four small toCusp, twoCusp withbifurcation.Cusp, severalfew to severalCusp,smooth,Cusp, sev-few to sev-Cusp, sev-Cusp, sev-pronounceddenticlesor withoutCusp with orsmall dent-very small tothree orslimeral smalleral smalleral dent-eral dent-denticles, eacheach sideone towithout sev-iclespronouncedfour longdenticlesdenticles,iclesiclessidesix pro-eral denticlesdenticlesdenticlesright sidenouncedeach sidedenticleseach sideLateralElongated.CuspElongated.Squared orElongated.CuspElongated.Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.triangular,Cusp ex-elongated.external, withCusp tri-Cusp tri-Cusp tri-Cusp bold,CuspCusp bold,Cusp tri-Cusp tri-external.Dent-ternal.Dent-Cusp tri-or withoutangularangularangularsmooth,bold, ex-external,angular,angular,icles: two oricles: oneangular,bold, withexternal.external.external.external.ternal, tri-smooth.external.external.three small tointernal; twointernal oror withoutDenticles:Denticles: fewDenticles:Truncatedangular.TruncatedDenticles:Denticles:pronounced,external.external.internal trun-several small,to several,four toprojectionDenticles:projectionseveral,several,internal; oneDenticles:cated projec-both sidesvery small toseven,internal,small,internal, sev-both sidesboth sidesor two small toone to six,tion.Denticles:pronounced,long, bothsmoothexternal.eral smalllarge, externalboth sideswith orboth sides orsidesTruncateddenticles,without bothinternal sideprojection,distal sideor internalinternal,sidesmalldenticles,distal sideMarginalNarrow,Narrow, oneNarrow,–––––––––smoothsmall den-with orticle, internalwithoutsideone smalldenticle,internalsideJawsShapeElongatedElongated.Short toShort toShort.Small,Short toShort.Ex-ShortElongatedShort toShort toShortDenticleselongated.elongatedvertical, cen-elongatedternal,elongatedelongatedDenticlestral protru-uppersionside pro-trusion

Table 2. Synopsis of the most useful characters and information for diagnosis of subfamilies and generaCharacterMarseniopsinaeHainotinaeVelutininaeLamellariinaeCalyptoconchaVariolipalliumPacificaDjiboutiaCoriocellaLamellariaMarseniaMarseniellaExternal morphologyShapeFlat or domeDome shaped;Flat orFlat or domeFlat or domeFlat or domeFlat orFlat orDomeFlat orFlat orFlat; outlineshaped; outlineoutlinedomeshaped; out-shaped; out-shaped; out-domedomeshaped;dome shaped;domeroundedrounded or pol-rounded orshaped;line roundedline roundedline roundedshaped;shaped;outlineoutlineshaped;ygonalpolygonaloutlineor polygonalor polygonaloutlineoutlinerounded,roundedoutlineroundedroundedroundedtwo to sixroundedwartsSize (cm)0.5–11.50.5–5.00.5–11.00.5–10.01–40.5–3.00.5–1.00.5-3.31.5–8.50.3–1.10.3–102.2MantleFused orFusedFused orFused orFusedFused orFusedFusedFusedFusedFused orFuseddorsal fissurenot fuseddorsal fissuredorsal fissuredorsal fis-sureShellShapeEar shapedEar shapedEar, shieldEar shapedEar shapedEar shapedEarEar shapedEar shapedEar shapedEar shapedEar shaped,or capshapedlast whorlshapeddetachedfrom spireSpireHighHighLow orLow or highHighHighLowLowLowLowLow orLowhighhighThicknessVery thinThin or veryModeratelyThin or veryVery thinVery thinVery thinThin or veryThinThinThinThinthinthin orthinthinthinTextureWeak to mem-WeakStrong toStrong toWeak to mem-Weak to mem-WeakWeakStrong toWeakWeakMembran-branaceousweakmembranaceusbranaceousbranaceousmoderateaceousPeriostracumThin to not vis-Thin to mod-ModeratelyThin to not vis-Not visibleNot visibleNot visibleNot visibleThinNot visibleNot visible?ibleeratelyor wellibledeveloped,developed,hairyoccasion-ally hairyNucleousWith or without?With orSubsuturalSmoothSubsuturalSubsuturalSubsuturalSubsuturalSubsuturalSubsutural?granular sculp-withoutaxial foldsaxial foldsaxial foldsaxial foldsaxial foldsaxial foldsaxial foldsturegranularsculptureRadulaFormula2:1:1:1:22:1:1:1:22:1:1:1:20:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:00:1:1:1:0RachidianElongated.BaseElongated.Squared.Elongated.Elong-Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.rectangular.Base rect-BaseBase withated.BaseBase bifur-Base bi-Base bifur-Base bi-Base bifur-Base bi-Base bi-Cusp, three toangular.broad.or withoutsquared.cated.Cusp,furcated.cated.Cuspfurcated.cated.Cusp,furcated.furcated.four small toCusp, twoCusp withbifurcation.Cusp, severalfew to severalCusp,smooth,Cusp, sev-few to sev-Cusp, sev-Cusp, sev-pronounceddenticlesor withoutCusp with orsmall dent-very small tothree orslimeral smalleral smalleral dent-eral dent-denticles, eacheach sideone towithout sev-iclespronouncedfour longdenticlesdenticles,iclesiclessidesix pro-eral denticlesdenticlesdenticlesright sidenouncedeach sidedenticleseach sideLateralElongated.CuspElongated.Squared orElongated.CuspElongated.Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.Elongated.triangular,Cusp ex-elongated.external, withCusp tri-Cusp tri-Cusp tri-Cusp bold,CuspCusp bold,Cusp tri-Cusp tri-external.Dent-ternal.Dent-Cusp tri-or withoutangularangularangularsmooth,bold, ex-external,angular,angular,icles: two oricles: oneangular,bold, withexternal.external.external.external.ternal, tri-smooth.external.external.three small tointernal; twointernal oror withoutDenticles:Denticles: fewDenticles:Truncatedangular.TruncatedDenticles:Denticles:pronounced,external.external.internal trun-several small,to several,four toprojectionDenticles:projectionseveral,several,internal; oneDenticles:cated projec-both sidesvery small toseven,internal,small,internal, sev-both sidesboth sidesor two small toone to six,tion.Denticles:pronounced,long, bothsmoothexternal.eral smalllarge, externalboth sideswith orboth sides orsidesTruncateddenticles,without bothinternal sideprojection,distal sideor internalinternal,sidesmalldenticles,distal sideMarginalNarrow,Narrow, oneNarrow,–––––––––smoothsmall den-with orticle, internalwithoutsideone smalldenticle,internalsideJawsShapeElongatedElongated.Short toShort toShort.Small,Short toShort.Ex-ShortElongatedShort toShort toShortDenticleselongated.elongatedvertical, cen-elongatedternal,elongatedelongatedDenticlestral protru-uppersionside pro-trusion

This dataset contains the digitized treatments in Plazi based on the original journal article Fassio, Giulia, Stefani, Matteo, Russini, Valeria, Buge, Barbara, Bouchet, Philippe, Treneman, Nancy, Malaquias, Manuel António E., Schiaparelli, Stefano, Modica, Maria Vittoria, Oliverio, Marco (2023): Neither slugs nor snails: a molecular reappraisal of the gastropod family Velutinidae. Zoological Journal of the Linnean Society 197 (4): 924-964, DOI: 10.1093/zoolinnean/zlac091, URL: http://dx.doi.org/10.1093/zoolinnean/zlac091

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