Contents of World Wide Malacological CATalog (Nordamerica)
Classification elements
| subclassis | n. | 6 |
| superordo | n. | 1 |
| ordo | n. | 10 |
| subordo | n. | 7 |
| superfamilia | n. | 33 |
| familia | n. | 66 |
| subfamilia | n. | 60 |
| tribus | n. | 6 |
| genus | n. | 219 |
| subgenus | n. | 0 |
| speciem | n. | 1425 |
| sinonim | n. | 0 |
Numbers of species included into each familia
| CLASSIS GASTROPODA | | |
| familia | helicinidae | 6 |
| familia | hydrobiidae | 161 |
| familia | iravadiidae | 2 |
| familia | pomatiopsidae | 6 |
| familia | micromelaniidae | 1 |
| familia | megalomastomidae | 1 |
| familia | viviparidae | 21 |
| familia | ampullariidae | 4 |
| familia | thiaridae | 1 |
| familia | pleuroceridae | 195 |
| familia | pomatiasidae | 1 |
| familia | annulariidae | 1 |
| familia | truncatellidae | 10 |
| familia | valvatidae | 16 |
| familia | carychiidae | 5 |
| familia | acroloxidae | 1 |
| familia | lymnaeidae | 59 |
| familia | lancidae | 7 |
| familia | physidae | 77 |
| familia | planorbidae | 56 |
| familia | neoplanorbidae | 5 |
| familia | ancylidae | 12 |
| familia | cochlicopidae | 1 |
| familia | pupillidae | 8 |
| familia | valloniidae | 9 |
| familia | vertiginidae | 56 |
| familia | strobilopsidae | 5 |
| familia | clausiliidae | 2 |
| familia | orthalicidae | 89 |
| familia | urocoptidae | 13 |
| familia | microceramidae | 2 |
| familia | ferussaciidae | 1 |
| familia | subulinidae | 6 |
| familia | achatinidae | 1 |
| familia | spiraxidae | 3 |
| familia | oleacinidae | 1 |
| familia | streptaxidae | 1 |
| familia | haplotrematidae | 3 |
| familia | punctidae | 5 |
| familia | helicodiscidae | 6 |
| familia | discidae | 11 |
| familia | oreohelicidae | 16 |
| familia | succineidae | 23 |
| familia | sagdidae | 2 |
| familia | euconulidae | 5 |
| familia | helixarionidae | 3 |
| familia | ariophantidae | 1 |
| familia | vitrinidae | 5 |
| familia | zonitidae | 59 |
| familia | milacidae | 1 |
| familia | limacidae | 4 |
| familia | polygyridae | 135 |
| familia | thysanophoridae | 4 |
| familia | camaenidae | 5 |
| familia | helicellidae | 4 |
| familia | helicidae | 1 |
| familia | bradybaenidae | 2 |
| familia | helminthoglyptidae | 90 |
| CLASSIS BIVALVIA | | |
| familia | philomycidae | 11 |
| familia | margaritiferidae | 3 |
| familia | unionidae | 129 |
| familia | hyriidae | 1 |
| familia | etheriidae | 1 |
| familia | dreissenidae | 6 |
| familia | corbiculidae | 12 |
| errors | n. | 0 |