Table 2

The 41 freshwater gastropod species confirmed from Mid-Atlantic drainages are listed in the left column below, ordered by their number of records in our database, with FWGNA incidence ranks.  The suffix "p" marks peripheral species, and asterisks* indicate species demonstrating non-apparent rarity.  This list is compared to the spurious review of Johnson et al (2013), giving synonyms as necessary.

Confirmed in this study
Records
FWGNA
Johnson et al (2013)
Physa acuta 701 I-5 Physella heterostropha, P. integra
Menetus dilatatus 260 I-5 Micromenetus dilatatus
Ferrissia rivularis 228 I-5 F. rivularis
Lymnaea humilis 197 I-5 Galba humilis, G. obrussa, G. parva, G. modicella, G. exigua, G. dalli, G. rustica
Ferrissia fragilis 162 I-5 F. fragilis
Lymnaea columella 159 I-5 Pseudosuccinea columella
Leptoxis carinata 140 I-5 L. carinata
Gyraulus parvus 121 I-5 G. parvus
Pleurocera virginica 117 I-5 Elimia virginica
Helisoma trivolvis 112 I-5 Planorbella trivolvis, P. pilsbryi
Helisoma anceps 108 I-5 H. anceps
Amnicola limosa 100 I-5 A. limosus
Campeloma decisum 90 I-5 C. decisum, C. rufrum
Physa gyrina 79 I-5 Physella gyrina, Physella ancillaria
Lyogyrus granum 54 I-5 L. granum, L. pupoideus, P. walkeri
Laevapex fuscus 36 I-5 L. fuscus
Bellamya chinensis 33 I-4  -
Planorbula armigera 23 I-4 P. armigera
Bellamya japonica 21 I-4  -
Littoridinops tenuipes 19 I-4 L. tenuipes
Fontigens bottimeri 17 I-3* F. bottimeri
Valvata tricarinata 15 I-3p V. tricarinata
Helisoma campanulatum 14 I-3p Planorbella campanulata
Lymnaea catascopium 14 I-3p Stagnicola catascopium, S. emarginata
Physa pomilia 11 I-4 Physella pomilia, Physella hendersoni
Promenetus exacuous 11 I-4 P. exacuous
Lymnaea elodes 9 I-3p Stagnicola elodes
Viviparus georgianus 8 I-4 V. georgianus
Gyrulus deflectus 8 I-3p G. deflectus
Somatogyrus pennsylvanicus 8 I-3* S. pennsylvanicus
Bithynia tentaculata 6 I-3p  -
Fontigens nickliniana 5 I-4 F. nickliniana
Physa carolinae 5 I-4  -
Pomatiopsis lapidaria 5 I-3p P. lapidaria
Fontigens orolibas 2 I-4* F. orolibas
Valvata bicarinata2I-4V. bicarinata
Pleurocera proxima 1 I-5  -
Lioplax subcarinata 1 I-4 L. subcarinata
Potamopyrgus antipodarum 1 I-1p  -
Aplexa hypnorum 1 I-1p A. elongata
Physa vernalis 1 I-1 P. vernalis
TOTAL 2,905    

    

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