Table 2

The 40 freshwater gastropod species confirmed from Virginia Atlantic drainages are listed in the left column below (combining subspecies), ordered by their number of records in our database, with FWGNA incidence ranks.  The suffix "p" marks peripheral species, and asterisks* mark species demonstrating non-apparent rarity.

Confirmed in this study
Records
FWGNA
Leptoxis carinata 365
I-5
Campeloma decisum
241
I-5
Physa acuta
232
I-5
Menetus dilatatus 199
I-5
Helisoma anceps 183 I-5
Ferrissia fragilis 158
I-5
Lymnaea columella 128
I-5
Lymnaea humilis
100
I-5
Pleurocera virginica 84 I-5
Lyogyrus granum
69
I-5
Physa gyrina 62 I-5
Ferrissia rivularis 57
I-5
Laevapex fuscus53I-5
Gyraulus parvus42I-5
Pleurocera proxima
39
I-5
Helisoma trivolvis
37 I-5
Physa pomilia 35 I-4
Amnicola limosa34I-5
Pleurocera catenaria dislocata
P. catenaria catenaria (combined)
18
8
I-5
Fontigens orolibas23I-4*
Fontigens nickliniana 21
I-4
Physa carolinae
21
I-4
Pleurocera shenandoa 20
I-3p
Bellamya japonica
15
I-4
Somatogyrus virginicus8I-4
Lioplax subcarinata 7
I-4
Littoridinops tenuipes
7
I-4
Bithynia tentaculata 5 I-3p
Promenetus exacuous
5
I-4
Planorbula armigera
3
I-4
Fontigens morrisoni 3 I-2
Gillia altilis3I-4
Hebetancylus excentricus 2
I-3p
Fontigens bottimeri 2
I-3*
Fontigens tartarea
2
I-2
Valvata tricarinata 2
I-3p
Viviparus georgianus 1
I-4
Holsingeria unthanksensis
1 I-1
Gyraulus deflectus 1
I-3p
Pomatiopsis lapidaria 1 I-3p
Bellamya chinensis 0  I-4
Aplexa hypnorum
0  I-1p
Valvata bicarinata 0  I-4
TOTAL 2,294   

    

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