| Scientific Name | Common Name | Heritage Global Rank | Heritage State Rank | Federal Status | State Status | Heritage List | Oregon County Distribution | Oregon Ecoregion Distribution | Other States |
| Class Turbellaria - Flatworms | |||||||||
| Order Tricladida | |||||||||
| Kenkia rhynchida | A flatworm (planarian) | G1G2 | S1S2 | SOC | 1 | Harney | BR | ||
| Class Bivalvia - Clams, Oysters & Mussels | |||||||||
| Order Ostreoida | |||||||||
| Ostrea conchaphila | Native oyster | GNR | SNR | 3 | Lincoln, Tillamook | CR | WA | ||
| Order Unionoida | |||||||||
| Anodonta californiensis | California floater (mussel) | G3 | S1 | SOC | 2 | Clatsop, Columbia, Coos?, Deschutes, Grant, Harney, Klamath, Linn, Malheur, Multnomah, Sherman, Wasco, Washington | BM, BR, CB, CR, EC, WC, WV | CA, ID, NV, WA + | |
| Anodonta oregonensis | Oregon floater (mussel) | G5 | S3 | 4 | Benton, Clackamas, Clatsop, Columbia, Coos, Douglas, Harney, Klamath, Lane, Lincoln, Marion, Multnomah, Polk, Sherman, Wasco, Washington | BR, CB, CR, EC, KM, WC, WV | CA, NV, UT, WA | ||
| Anodonta wahlametensis | Willamette floater (mussel) | G2Q | S1 | 1 | Clatsop, Columbia, Harney, Multnomah, Wasco? | BR, CR, EC, WC, WV | CA, WA | ||
| Gonidea angulata | Western ridgemussel | G3 | S2 | 2 | Clackamas, Columbia, Deschutes, Harney, Klamath, Linn, Malheur, Marion, Multnomah, Wasco, Washington | BM, BR, CB, EC, WC, WV | CA, ID, NV, WA, BC | ||
| Margaritifera falcata | Western pearlshell | G4 | S3 | 4 | Benton, Clackamas, Clatsop, Coos, Crook, Deschutes, Douglas, Harney, Klamath, Lane, Lincoln, Linn, Marion, Polk, Sherman, Wasco, Washington, Wheeler | BM, BR, CB, CR, EC, WC, WV | CA, ID, NV, WA + | ||
| Order Veneroida | |||||||||
| Pisidium ultramontanum | Montane peaclam | G1 | S1 | SOC | 1 | Klamath | EC | CA | |
| Pisidium sp. nov. | Modoc peaclam | G1 | S1 | 1 | Klamath | EC | CA | ||
| Class Gastropoda - Snails & Slugs | |||||||||
| Order Neotaenioglossa | |||||||||
| Algamorda newcombiana | Newcomb's littorine snail | G1G2 | S1 | SOC | 1 | Coos | CR | CA, WA | |
| Colligyrus depressus | Harney Basin duskysnail | G1 | S1 | 1 | Harney | BR | |||
| Colligyrus sp. nov. | Blue Mountains duskysnail | G1 | S1 | 1 | Baker, Grant | BM | |||
| Colligyrus sp. nov. | Columbia duskysnail | G2 | S2 | 1 | Clackamas, Hood River, Multnomah, Wasco | CB, EC, WC, WV | WA | ||
| Colligyrus sp. nov. | Klamath duskysnail | G1 | S1 | 1 | Klamath | EC | |||
| Colligyrus sp. nov. | Link River duskysnail | G1 | S1 | 1 | Klamath | EC | |||
| Colligyrus sp. nov. | Mare's egg duskysnail | G1 | S1 | 1 | Klamath | EC | |||
| Colligyrus sp. nov. | Nodose duskysnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola fuscus | Columbia pebblesnail or spire snail | G2 | S1 | SOC | 1 | Multnomah, Wallowa, Wasco | BM, CB, WV | ID, MT, WA, WY, BC | |
| Fluminicola insolitus | Donner und Blitzen pebblesnail | G1 | S1 | 1 | Harney | BR | |||
| Fluminicola turbiniformis | Turban pebblesnail | G3 | S1 | 1 | Harney, Lake | BR, EC | CA, NV | ||
| Fluminicola sp. nov. | Casebeer pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Crooked Creek pebblesnail | G2 | S2 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Diminuitive pebblesnail | G1 | S1 | 1 | Jackson | WC | |||
| Fluminicola sp. nov. | Fall Creek pebblesnail | G1 | S1 | 1 | Jackson, Klamath | WC | |||
| Fluminicola sp. nov. | Keene Creek pebblesnail | G1 | S1 | 1 | Jackson, Klamath | EC, KM | |||
| Fluminicola sp. nov. | Klamath pebblesnail | G1G2 | S1S2 | 1 | Klamath, Lake | EC | CA | ||
| Fluminicola sp. nov. | Klamath Rim pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Lake of the Woods pebblesnail | G1G2 | S1S2 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Lost River pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Malheur pebblesnail | G1 | S1 | 1 | Harney, Malheur | BR | |||
| Fluminicola sp. nov. | Metolius pebblesnail | G1 | S1 | 1 | Jefferson | EC | |||
| Fluminicola sp. nov. | Nerite pebblesnail | G1 | S1 | 1 | Jackson | WC | |||
| Fluminicola sp. nov. | Odessa pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Ouxy Spring pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Pinhead pebblesnail | G1 | S1 | 1 | Clackamas | WC | |||
| Fluminicola sp. nov. | Tall pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Tiger lily pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Fluminicola sp. nov. | Toothed pebblesnail | G1 | S1 | 1 | Jackson | WC | |||
| Fluminicola sp. nov. | Tuscan pebblesnail | G1 | S1 | 1 | Wasco | CB | |||
| Fluminicola sp. nov. | Wood River pebblesnail | G1 | S1 | 1 | Klamath | EC | |||
| Juga acutifilosa | Scalloped juga (snail) | G2 | S1 | 1 | Jackson | EC | CA | ||
| Juga bulbosa | Bulb juga (snail) | G1 | S1 | 1 | Jefferson, Sherman, Wasco | BM, CB | |||
| Juga hemphilli dallesensis | Dalles juga (snail) | G2T1 | S1 | 1 | Hood River, Wasco | EC, WC | WA | ||
| Juga hemphilli hemphilli | Barren juga (snail) | G2T1 | S1 | 1 | Multnomah, Wasco | WC, WV | WA | ||
| Juga hemphilli maupinensis | Purple-lipped juga (snail) | G2T1 | S1 | 1 | Jefferson, Sherman, Wasco | BM, CB | |||
| Juga hemphilli ssp. nov. | Indian Ford juga (snail) | G2T1 | S1 | 1 | Deschutes | EC | |||
| Juga sp. nov. | Basalt juga (snail) | G1 | S1 | 1 | Hood River, Wasco | EC, WC | |||
| Juga sp. nov. | Blue Mountains juga (snail) | G1 | S1 | 1 | Grant | BM | |||
| Juga sp. nov. | Brown juga (snail) | G1 | S1 | 1 | Hood River, Multnomah | WC | WA | ||
| Juga sp. nov. | Crooked River juga (snail) | G1 | S1 | 1 | Jefferson, Wasco | BM, CB | |||
| Juga sp. nov. | Opal Springs juga (snail) | G1 | S1 | 1 | Crook | BM | |||
| Juga sp. nov. | Purple juga (snail) | G1 | S1 | 1 | Wasco | CB | |||
| Juga sp. nov. | Three-band juga (snail) | G1 | S1 | 1 | Gilliam, Hood River, Sherman, Wasco | CB, EC, WC | WA | ||
| Pomatiopsis binneyi | Robust walker | G1 | S1 | 1 | Curry, Josephine | CR, KM | CA | ||
| Pomatiopsis californica | Pacific walker | G1 | S1 | 1 | Coos, Lane | CR | CA | ||
| Pomatiopsis chacei | Marsh walker | G1 | S1 | 1 | Curry | CR, KM | CA | ||
| Pristinicola hemphilli | Pristine springsnail | G3Q | S2 | 3 | Baker, Clackamas, Grant, Hood River, Jefferson, Lane, Multnomah, Sherman, Union, Wallowa, Wasco | BM, CB, EC, WC | CA, ID, WA | ||
| Pyrgulopsis archimedis | Archimedes springsnail | G1Q | S1 | 1 | Klamath | EC | |||
| Pyrgulopsis hendersoni | Harney Lake springsnail | G1 | S1 | 1 | Harney, Lake | BR | |||
| Pyrgulopsis intermedia | Crooked Creek springsnail | G1 | S1 | 1 | Malheur | BR | |||
| Pyrgulopsis sp. nov. | Columbia springsnail | G1Q | S1 | 1 | Sherman, Umatilla, Wasco | CB | WA | ||
| Pyrgulopsis sp. nov. | Klamath Lake springsnail | G1 | S1 | 1 | Klamath | EC | |||
| Pyrgulopsis sp. nov. | Lake Abert springsnail | G1 | S1 | 1 | Lake | BR | |||
| Pyrgulopsis sp. nov. | Lost River springsnail | G1 | S1 | 1 | Klamath | EC | |||
| Pyrgulopsis sp. nov. | Malheur springsnail | G1 | S1 | 1 | Malheur | BR | |||
| Pyrgulopsis sp. nov. | Owyhee hot springsnail | G1 | S1 | 1 | Malheur | BR | |||
| Order Basommatophora | |||||||||
| Fisherola nuttalli | Shortface lanx (=giant Columbia River limpet) | G2 | S1S2 | 1 | Jefferson, Multnomah, Sherman, Wallowa, Wasco | CB, WV | ID, MT, WA, BC | ||
| Helisoma newberryi newberryi | Great Basin ramshorn (snail) | G1T1 | S1 | 1 | Klamath, Lake | BR, EC | CA | ||
| Lanx alta | Highcap lanx (snail) | G1 | S1 | 1 | Curry, Jackson, Josephine, Klamath | EC, KM | CA | ||
| Lanx klamathensis | Scale lanx (snail) | G1 | S1 | 1 | Klamath | EC | CA | ||
| Lanx subrotunda | Rotund lanx (snail) | G2 | S2 | 1 | Douglas, Jackson, Josephine | KM | |||
| Petrophysa sp. nov. | Hotspring physa (snail) | G1 | S1 | 1 | Malheur | BR | |||
| Physa megalochlamys | Large-mantle physa (snail) | G3 | S1 | 2 | Harney | BR | ID + | ||
| Physella columbiana | Rotund physa (snail) | G2 | SH | 1 | Clatsop, Columbia, Hood River, Multnomah, Wasco | CR, WC, WV | WA + | ||
| Planorbella oregonensis | Borax Lake ramshorn (snail) | G1 | S1 | 1 | Harney | BR | UT? | ||
| Vorticifex effusus dalli | Dall's ramshorn (snail) | G3QT1 | S1 | 1 | Klamath | EC | |||
| Vorticifex effusus diagonalis | Lined ramshorn (snail) | G3QT1 | S1 | 1 | Klamath | EC | |||
| Vorticifex klamathensis klamathensis | Klamath ramshorn (snail) | G1QT1 | S1 | 1 | Klamath | EC | CA | ||
| Vorticifex klamathensis sinitsini | Sinitsin ramshorn (snail) | G1QT1 | S1 | 1 | Klamath | EC | |||
| Vorticifex neritoides | Nerite ramshorn (snail) | G1Q | SH | 1 | Clatsop, Columbia, Hood River, Multnomah | CR, WC, WV | WA | ||
| Order Stylommatophora | |||||||||
| Cryptomastix devia | Puget oregonian (snail) | G2 | S1 | 1 | Hood River, Multnomah, Wasco | EC, WC, WV | WA | ||
| Cryptomastix hendersoni | Columbia Gorge oregonian (snail) | G1G2 | S1S2 | 1 | Hood River, Sherman, Wasco | CB, EC | WA | ||
| Cryptomastix populi | Hell's Canyon land snail | G2 | S1 | 1 | Wallowa | BM | ID, WA | ||
| Cryptomastix sp. nov. | Disc oregonian (snail) | G1 | S1 | 1 | Wallowa | BM | ID, WA | ||
| Deroceras hesperium | Evening fieldslug | G1 | S1 | 1 | Clackamas, Clatsop, Columbia, Jackson, Klamath | CR, EC, WC, WV | WA, BC | ||
| Gliabates oregonius | Salamander slug | G1Q | S1 | 1 | Clackamas, Hood River, Lane, Linn | CR, EC, WC | ID | ||
| Helminthoglypta hertleini | Oregon shoulderband (snail) | G1 | S1 | 1 | Douglas, Jackson, Josephine | KM, WC | CA | ||
| Hemphillia glandulosa | Warty jumping-slug | G3 | S2 | 2 | Benton, Lincoln, Tillamook, Yamhill | CR, WV | WA | ||
| Hemphillia malonei | Malone jumping-slug | G3 | S3 | 4 | Benton, Clackamas, Hood River, Marion, Multnomah | CR, WC | |||
| Hesperarion mariae | Tillamook westernslug | G2 | S2 | 1 | Douglas, Lane, Tillamook | CR | |||
| Hochbergellus hirsutus | Sisters hesperian (snail) | G1 | S1 | 1 | Curry | KM | |||
| Megomphix hemphilli | Oregon megomphix (snail) | G3 | S3 | 4 | Benton, Clatsop, Columbia, Coos, Douglas, Lane, Linn, Marion, Multnomah, Tillamook, Washington, Yamhill | CR, KM, WC, WV | WA | ||
| Megomphix lutarius | Umatilla megomphix (snail) | G1 | SH | 3 | Umatilla, Wallowa? | BM | WA | ||
| Monadenia chaceana | Chace sideband (snail) | G1Q | S1 | 1 | Douglas, Jackson, Josephine | KM, WC | CA | ||
| Monadenia fidelis beryllica | Green sideband (snail) | G4G5T1T2 | S1S2 | 1 | Coos, Curry | KM | |||
| Monadenia fidelis celeuthia | Traveling sideband (snail) | G4G5T1 | S1 | 1 | Jackson | WC | |||
| Monadenia fidelis columbiana | Columbia sideband (snail) | G4G5T1 | S1 | 1 | Hood River | WC | WA | ||
| Monadenia fidelis minor | Oregon snail (Dalles sideband) | G4G5T1 | S1 | SOC | 1 | Sherman, Wasco | CB | WA | |
| Monadenia fidelis ssp. nov. | Deschutes sideband (snail) | G4G5T1 | S1 | 1 | Sherman, Wasco | BM, CB | |||
| Monadenia fidelis ssp. nov. | Modoc sideband (snail) | G4G5T1 | S1 | 1 | Klamath | EC | |||
| Ogaridiscus subrupicola | Southern tightcoil (snail) | G1 | S1 | 1 | Umatilla, Wallowa | BM | ID, UT | ||
| Oreohelix strigosa delicata | Blue mountainsnail | G5T1 | S1 | 1 | Wallowa | BM | |||
| Oreohelix variabilis variabilis | Dalles mountainsnail | G1T1 | S1 | 1 | Sherman, Wasco | CB | |||
| Oreohelix variabilis ssp. nov. | Deschutes mountainsnail | G1T1 | S1 | 1 | Sherman, Wasco | CB | |||
| Oreohelix sp. nov. | Hells Canyon mountainsnail | G2 | S1? | 1 | Wallowa | BM | ID, WA | ||
| Polygyrella polygyrella | Humped coin (snail) | G2G3 | SH | 3 | Umatilla | BM | ID, MT, WA | ||
| Pristiloma arcticum crateris | Crater Lake tightcoil (snail) | G4T1 | S1 | 1 | Deschutes, Douglas, Jefferson, Klamath | EC, WC | |||
| Pristiloma johnsoni | Broadwhorl tightcoil (snail) | G3 | S2? | 2 | Douglas?, Lane, Tillamook | CR, WC? | WA | ||
| Pristiloma pilsbryi | Crowned tightcoil (snail) | G1 | S1 | 1 | Lincoln | CR | WA | ||
| Pristiloma wascoense | Shiny tightcoil (snail) | G2Q | SH | 3 | Wallowa, Wasco | BM, EC | ID, WA | ||
| Prophysaon vanattae pardalis | Spotted tail-dropper | G4T2 | S2 | 1 | Clackamas, Coos, Lane, Tillamook | CR, WC | WA | ||
| Prophysaon sp. nov. | Klamath tail-dropper | G2 | S1S2 | 1 | Douglas, Jackson, Josephine, Klamath | EC, KM | CA | ||
| Radiodiscus abietum | Fir pinwheel (snail) | G3 | S1 | 2 | Union, Wallowa | BM | ID, MT, WA | ||
| Vespericola depressus | Columbia Gorge hesperian (snail) | G2 | S2 | 1 | Sherman, Wasco | CB | WA | ||
| Vespericola sierranus | Siskiyou hesperian (snail) | G2 | S1 | 1 | Jackson, Josephine | EC, KM, WC | CA | ||
| Vespericola sp. nov. | Bald hesperian (snail) | G1 | S1 | 1 | Lane | WV | |||
| Vespericola sp. nov. | Oak Springs hesperian (snail) | G1 | S1 | 1 | Sherman, Wasco | CB | |||
| Class Oligochaeta - Earthworms | |||||||||
| Order Haplotaxida | |||||||||
| Driloleirus macelfreshi | Oregon giant earthworm | G1 | S1 | SOC | 1 | Lincoln, Linn, Marion, Polk, Yamhill | CR, WV | ||
| Class Arachnida - Spiders, Scorpions, Mites & Ticks | |||||||||
| Order Pseudoscorpiones | |||||||||
| Apochthonius malheuri | Malheur pseudoscorpion | G1 | S1 | SOC | 1 | Harney | BR | ||
| Class Branchiopoda - Crustaceans | |||||||||
| Order Anostraca | |||||||||
| Branchinecta lynchi | Vernal pool fairy shrimp | G2G3 | S2S3 | LT | 1 | Jackson | KM | CA | |
| Class Malacostraca - Crustaceans | |||||||||
| Order Isopoda | |||||||||
| Amerigoniscus malheurensis | Malheur isopod | G1 | S1 | 1 | Harney | BR | |||
| Order Amphipoda |