Page 90 - Land Snails of New Mexico

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Table1. SpeciesoflandsnailsreportedfromsomelocalitiesontheHighPlainsofeasternNew MexicoandTexas.
Carychium exiguum
Pupilla blandi 2 Pupilla muscorum 1 3 Pupilla syngenes (?) Pupoides albilabris 1 6 Pupoides inornatus 3 Gastrocopta armifera 1 5 Gastrocopta ruidosensis
217
7.0 526 1.0
Gastrocopta contracta Gastrocopta holzingeri Gastrocopta pentodon Gastrocopta procera 7 Gastrocopta cristata 9 Gastrocopta pellucida 6 Vertigo ovata
1
Vertigo elation
Vertigo milium 1 Vertigo modesta I Vallonia cyclophorella 4 Vallonia gracilicosta 1 8 Valloniaparvula 10
15
8 2.0
Rabdotus dealbatus 1 Punctum minutissimum
0.4
Helicodiscus eigenmanni 12 Helicodiscus parallelus 8 Helicodiscus singleyanus 1 Discus whitneyi I Oxyloma retusum 1
I
0.8 .
Succineidae
Euconulus fulvus Nesovitrea hammonis Hawaiia minuscula Zonitoides arboreus Deroceras laeve
I
1 2
0.1 28 12.0 0.1
'Frye, Leonard, and Glass (1978) *Leonard and Frye (1975) *Leonard, Frye, and Glass (1975) *McMullen and Zakrzewski (1972)
*Drake (1975), shell fragments recorded by Drake not included
24 4
16
I
was found atonly 4 of44 localitiesinnortheasternNew Mexico (Frye,Leonard, and Glass, 1978), and was absent to the south (Leonard and Frye, 1975, Leonard, Frye, and Glass, 1975). Such considerations do not suggest a "taiga" landscape as in the model of Wells and Stewart (1987) for the High Plains in Kansas. Rather, the grassland model proposed by Holliday (1987) seems
OfthespecieslistedinTable 1,onlyafew standoutasbeing enduring plains-adapted taxa. These include one or more species of succineids and several minute pupillids: Pupoides albilabris, P.inornatus,Gastrocoptacristata,G.proceraand,tothe south,G.pellucida.Some ofthesespeciesalsowererecorded from the Pliocene strata at the Clayton South locality (noted
indicatorofwoodlands, Zonitoides arboreus,
more likely to apply to most of eastern N e w Mexico during Wisconsin time.
above) by Leonard and Frye (1978).
T h e use of the term "eastern plains" m a y be misleading in
1 3 8 2
4 1
X X
8
8 2 3
3
1
5 2.0
8 1 3
2 4
X X
131
90
25 0.1 21 2.0
1 2
602 538 1 9
20 12.0 2.0 2 0 5 6.0
8
3
X
4 1
X X
106
100
20 37.0
2
2
3.0
39 27 11
X 270
6.0 40 4.0
1
216 8
“ O c c u r r e n c e (n) specimens: in
"Percentagefor
(n)localitiesinNew Mexico:
'Northeast "East-central "Southeast HardingCo., "RooseveltCo., "NashDraw, LubbockLake,
New Mexico
New Mexico
New Mexico
Texas
X 61 X1
2.0
‘Ashbaugh and Metcalf (1986)
"Pierce (1987), substratum 1 B-C, dated ca. 11,000 B P
regardtobothpresentandPleistocenehabitatsofeasternNew
Substratum 1,B-C
0.2 0.4