Page 19 - Land Snails of New Mexico
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10b Notwiththeabovecombinationofcharacters.Thisisasubfamilywithnumerousspecies,somewidespreadand
common inNew Mexico ............................................... Pupillidae(subfamilyPupillinae)(p.14)
11a Matureshell10mm ormoreinwidth ...................................................................12
11b
12a
12b
13a
13b
14a
14b
15a
|Sb
16a
16b
17a
17b
18a
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19a
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20a
20b
Matureshell8mm orlessinwidth....................................................................... 16
Matureshell>18mm inheight(mayreach25-30mm),withsomekindofbrownishbanding,
involving3ormorebands ............................................................................13
Matureshell<18mm inheight,usuallywithsomebrownishpigmentation,somewithbrownishbands ...............14
Largestlandsnailinstate,reaching30mm inbothwidthandheight,shellimperforate,introducedfromEurope, usuallyfoundinurbanorsuburbanareas........................................Helicidae:Helixaspersa (p.65)
AnativesnailfoundonlyintheGuadalupeMountainsalongtheNewMexico/Texasborder,largershells perforate,butneverimperforate(Fig.3L) ...........................Humboldtianidae:Humboldtianaultima(p.62)
In mature shell, walls of peristome (usually excluding the parietal) thickened to form a well-defined, solid lip, oftenpalerincolorthanremainderofshell,andoftenbearingoneormoreteeth(Fig.3M) ............Polygyridae(p.20)
Peristomenotthickenedinmatureshell,noteethpresent ...................................................15
Shell with a single brown band that contrasts strikingly with lighter color of remainder of shell, band
begins on third whorl and continues to lip of body whorl, which isrounded, peripherally, not angular
(Fig 3K) .............................................................Helminthoglyptidae:Sonorella(p.24)
Shell without single, simple, brown band, although there m a y be 2 or more bands, variously broken or fused,
or large blotches, or entire shell brownish in color. Shells range from slightly angular to carinate (Fig. 3 N ) - on body whorl . ......................................................................Oreohelicidae (p. 23)
Freshorwell-preservedshellsexhibitingsomekindofraisedsculpture.Thismay taketheformofliraeorribs (seediscussionofshellfeaturesabove,andFigures3O-P),shellnotthinandglossy ..............................17
Fresh or well-preserved shells relatively smooth, without well-defined, raised sculpture, shells
oftenthinandglossy .......................................................................* * * * * * * * * * 22
Shell with well-developed spiral lirae (up to 20 or more on body whorl) (Fig. 3O)
- - - - - - - - - - - - - ....................................... Helicodiscidae(inpart): Helicodiscuseigenmanni(p.40)
Shellwithwell-developed,raisedribs ...................................................................18
Matureshell>3.5mm inwidth.........................................................................19
Matureshell3.5mm orlessinwidth....................................................................20
Matureshell5-7mm inwidth.InNewMexico,thesearemontanespeciesoftheTransitionLifeZoneandabove
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Discidae(p.19)
Matureshell3.8-4.8mm inwidth,foundinrelativelyarid(desert)habitatsofLowerandUpperSonoran
LifeZones inNew Mexico . ...............................Thysanophoridae(inpart):Thysanophorahornii(p.60)
Peristome flared (expanded)somewhat like the mouth of a horn (bugle),usuallyslightlyreflectedand much thickenedinsomespecies ............................................................................21
Peristomenotflared,reflected,orthickened
* * * * * * * * * * * * * * * * * * * * Punctidae(inpart):ParalaomacaputspinulaeandCharopidae: Radiodiscusmillecostatus(p.18)
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