Page 20 - Land Snails of New Mexico

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21a
21b
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27a
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la
1b
2 a
2b
Ribsrelativelywidelyspaced(ca.0.1mm apart);umbilicusrelativelydeepandnarrow,itswidthcontained morethan3timesinwidthofshell.(Fig.3P) .........................Valloniidae(exceptValloniapulchella)(p.17)
Ribscloselyspaced(considerablylessthan0.1mm);umbilicusrelativelywideandflat,itswidthcontained lessthan3timesinshellwidth ........................... . . . . . . . Zonitidae(inpart):Striaturameridionalis(p.51)
Mature shell with only 2 or 3 whorls, b o d y whorl greatly expanded, shells delicate, easily crushed, translucent, usuallywithpalegreenishtint(Fig.2D). ..............................Vitrinidae:Vitrinapellucidaalaskana(p.51)
Matureshellwithmorethan2or3whorls,andbodywhorlnotnotablyexpanded,shellsnotwhitish-translucent orgreenish. ........................................................................................23
Matureshelldome shaped(Fig.3J)inprofile,glossyandbrownish,umbilicusbarelyperforate(justaslit)
or imperforate. ........................................................ Euconuliidae: Euconulus fulvus (p. 50)
Matureshellnotdomeshaped,umbilicuswelldeveloped. ...................................................24
Peristomeflared(expanded),slightlyreflectedandthickened. ...........Valloniidae(inpart):Walloniapulchella(p.64)
Peristomenotflared,reflected,orthickened ..............................................................25
Shell<2.0mm inwidth,periostracumsmooth,slightlyglossy,andbrownish
* * * * * * * * * - - - - - * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Punctidae(inpart):Punctumminutissimum(p.39)
Shellwidth>2.0mm,periostracumvariouscolors .........................................................26
Shell2-3mm inwidth(discussedunderrespectivefamiliesinkey,below)
* * * * * * * * * * * * * * * * * * Helicodiscidae (in part): Helicodiscus singleyanus or Zonitidae (in part): Hawaiia minuscula (p. 19)
Shell>3 m m inwidth ................................................................................27
Shelldepressed,withoutspire,flat,opaque,grayishincolor .. Thysanophoridae(inpart):Microphysulaingersolli(p.61)
Shell at least slightly elevated, w i t h l o w to well-developed spire, glossy, s o m e translucent, Somewithincisedgroovesonshell ..................................................Zonitidae(inpart)(p.19)
Slugsinwhichmantlehasfingerprint-likeconcentricridges,akeelextendsdorsallyfromposteriorend 2/3ofdistancetomantle,andpneumostomeislocatedinposteriorhalfofmantle................ . . . . . Limacidae(p.20)
Slugsinwhichmantlelacksfingerprint-likeconcentricridges,inwhichthereisnoposterior,dorsalkeel,and inwhichthepneumostomeisintheanteriorhalfofthemantle ..................- - - - - - - - - - - - - - - - - - Arionidae(p.20)
A KEY TO GENERA AND SPECIES
Pupillidae Subfamily Pupillinae
Shell cylindrical or with upper whorls wider than lower ones, periostracum light brownish, with 0-3 teeth,
withoutribs .............................................................................GenusPupilla2
Shellwithouttheabovecombination(1a)ofcharacteristics ...................................................6
Upper whorls (exceptembryonic ones) wider than lower ones, giving shell atop-heavy appearance, usually
with 3 teeth, a species of northwestern N e w Mexico ..........* * * * * * * * * * * * * * * * * * * * * * * * * * * .Pupilla syngenes (p. 26)
Upperwhorlsnotwiderthanlowerones ..................................................................3
3a
Peristomewithnoteethorwithonlyoneortwosmall(tubercular)teethonparietaland/orcolumellarwall .............4
. 4