Page 26 - Land Snails of New Mexico

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Slug; pneumostome in anterior half of right side of mantle, no posterior mid-dorsal keel, dark bands onmantleandposteriorlyonbody;noconcentricridgesonmantle ..................Arionidae:Arionfasciatus(p.65)
Slug;pneumostome inposteriorhalfofrightsideofmantle,posteriormid-dorsalkeel,patternof fingerprint-likeconcentricridgesonmantle: ......................................................Limacidae2 Largeslug,over30mm inlengthwhenextended,withcolorationpatternotherthanuniformgray,introducedspecies ....3
Smallslug,<30mm inlengthwhenextended,grayishincolor,nativespecies .....................Genus Deroceras 4
Slug50-60mm long,withdarklengthwisebandsdorsally,inurbanareas ...............Lehmanniavalentiana(p.65)
Slug70-100mm long,backgroundcolorduskyyellowishtogreenish,mottledwithyellowpatches, tentaclessteelblueincolor,mucusyellow................................................. Limaxflavus(p.65)
A smallslugofthehigherpartsoftheBlackRangeandMogollonMountains ...............Derocerasheterura(p.51)
A widespread,small,grayishslug,occurringfromurbanareasandrivervalleysatlowerelevations upintomountains,indamphabitats................................................... Deroceraslaeve(p.51)
Polygyridae
V-shapedtoothpresentonparietalwall;occursinlowerPecosValleyinNew Mexicoandintroduced insomeurbanareasinsouthernNew Mexico .....................GeneraLinisa(pp.52and64)andPolygyra(p.65)
Arionidae and Limacidae
Linisa texasiana, until recently assigned to Polygyra, is known from urban and natural areas in the Pecos Valley, Polygyra septemvolvaonlyfromoneresidenceinCarlsbad,atpresent Linisatexasianahasthreewell-developedteethintheouterlip,isrounded peripherally, and has a narrower umbilicus, < 2 5 % of shell width. Polygyra septemvolva has no teeth in the outer lip, is angular peripherally,andhasawiderumbilicus,ca.40% ofshellwidth.
1b Parietaltoothabsentor,ifpresent,notV-shaped.SpeciesofNewMexicomountains ................GenusAshmunella
Species of Ashmunella often are identified best by referring to mountain ranges in which they are endemic. In the key below, such distributional criteria, as well as shell characters, are employed. Species are grouped in the same geographic categories used with the species accounts below.
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SpeciesofNorthernNewMexico
Mature shelltoothless, a species oftheJemez and Nacimiento Mountains. .................Ashmunella ashmuni (p. 53)
Mature shell with a tooth in parietal, palatal, and basal positions, a species of the southernmost
Sangre de Cristo Mountains ........ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ashmunella thomsoniana (p. 52)
SpeciesofSouthernNew Mexico,EastoftheTularosaBasin
Shellrelativelyelevatedwithwell-developedspire,palataltoothabsentandotherteethabsentorpoorlydeveloped ......2
Shell slightly elevated or with almost no spire, parietal, palatal, and basal teeth all well developed; speciesofGuadalupeandCornudasMountains ............................................................4
Usually 2 low (twinned) basal teeth present, species of Capitan, Patos, Carrizo Mountains, and LoneMountain,LincolnCo......................................‘............. Ashmunellapseudodonta(p.53)
Basal tooth absent or one small tooth present, species of Sierra Blanca and Sacramento Mountains
(asliving) ......................................................................... Ashmunella rhyssa 3