List of threatened and endangered arthropods, including insects, arachnids, and crustaceans under the United States Endangered Species Act as of October 2013.[1]
Key to Listing Status codes:[2]
E - Endangered. An animal or plant species in danger of extinction throughout all or a significant portion of its range.
T - Threatened. An animal or plant species likely to become endangered within the foreseeable future throughout all or a significant portion of its range.
SAE or SAT - Listed as Endangered or Threatened due to similarity of appearance. A species may be treated as endangered or threatened if it resembles in appearance a species which has been listed and enforcement personnel would have difficulty distinguishing between the listed and the unlisted species; if the effect of this difficulty is an additional threat to the listed species; and if such treatment of the unlisted species would improve protection for the listed species.
| Inverted common name | Scientific name | Species group | Historic range | Where listed | Listing status | |
|---|---|---|---|---|---|---|
| Spider, Kauai cave wolf or pe'e pe'e maka 'ole | Adelocosa anops | Arachnids | U.S.A. (HI) | Entire | E | |
| Meshweaver, Robber Baron Cave | Cicurina baronia | Arachnids | U.S.A. (TX). | Entire | E | |
| Meshweaver, Madla's Cave Meshweaver, Braken Bat Cave | Cicurina madla, syn. Cicurina venii | Arachnids | U.S.A. (TX). | Entire | E | |
| Meshweaver, Government Canyon Bat Cave | Cicurina vespera | Arachnids | U.S.A. (TX). | Entire | E | |
| Spider, Tooth Cave | Leptoneta myopica | Arachnids | U.S.A. (TX) | Entire | E | |
| Spider, spruce-fir moss | Microhexura montivaga | Arachnids | U.S.A. (NC, TN) | Entire | E | |
| Spider, Government Canyon Bat Cave | Tayshaneta microps | Arachnids | U.S.A. (TX). | Entire | E | |
| Pseudoscorpion, Tooth Cave | Tartarocreagris texana | Arachnids | U.S.A. (TX) | Entire | E | |
| Harvestman, Cokendolpher Cave | Texella cokendolpheri | Arachnids | U.S.A. (TX). | Entire | E | |
| Harvestman, Bee Creek Cave | Texella reddelli | Arachnids | U.S.A. (TX) | Entire | E | |
| Harvestman, Bone Cave | Texella reyesi | Arachnids | U.S.A. (TX) | Entire | E | |
| Isopod, Madison Cave | Antrolana lira | Crustaceans | U.S.A. (VA) | Entire | T | |
| Fairy shrimp, Conservancy | Branchinecta conservatio | Crustaceans | U.S.A. (CA) | Entire | E | |
| Fairy shrimp, longhorn | Branchinecta longiantenna | Crustaceans | U.S.A. (CA) | Entire | E | |
| Fairy shrimp, vernal pool | Branchinecta lynchi | Crustaceans | U.S.A. (CA, OR) | Entire | T | |
| Fairy shrimp, San Diego | Branchinecta sandiegonensis | Crustaceans | U.S.A. (CA) | Entire | E | |
| Crayfish, Benton County cave | Cambarus aculabrum | Crustaceans | U.S.A. (AR) | Entire | E | |
| Crayfish, Hell Creek Cave | Cambarus zophonastes | Crustaceans | U.S.A. (AR) | Entire | E | |
| Amphipod, Illinois cave | Gammarus acherondytes | Crustaceans | U.S.A. (IL) | Entire | E | |
| Amphipod, Noel's | Gammarus desperatus | Crustaceans | U.S.A. (NM) | Entire | E | |
| Amphipod, diminutive | Gammarus hyalelloides | Crustaceans | U.S.A. (TX). | Entire | E | |
| Tadpole shrimp, vernal pool | Lepidurus packardi | Crustaceans | U.S.A. (CA) | Entire | E | |
| Isopod, Lee County cave | Lirceus usdagalun | Crustaceans | U.S.A. (VA) | Entire | E | |
| Crayfish, Nashville | Faxonius shoupi | Crustaceans | U.S.A. (TN) | Entire | E | |
| Crayfish, Shasta | Pacifastacus fortis | Crustaceans | U.S.A. (CA) | Entire | E | |
| Shrimp, Squirrel Chimney Cave | Palaemonetes cummingi | Crustaceans | U.S.A. (FL) | Entire | T | |
| Shrimp, Alabama cave | Palaemonias alabamae | Crustaceans | U.S.A. (AL) | Entire | E | |
| Shrimp, Kentucky cave | Palaemonias ganteri | Crustaceans | U.S.A. (KY) | Entire | E | |
| Amphipod, Kauai cave | Spelaeorchestia koloana | Crustaceans | U.S.A. (HI) | Entire | E | |
| Fairy shrimp, Riverside | Streptocephalus woottoni | Crustaceans | U.S.A. (CA) | Entire | E | |
| Amphipod, Peck's cave | Stygobromus pecki | Crustaceans | U.S.A. (TX) | Entire | E | |
| Amphipod, Hay's Spring | Stygobromus hayi | Crustaceans | U.S.A. (DC) | Entire | E | |
| Shrimp, California freshwater | Syncaris pacifica | Crustaceans | U.S.A. (CA) | Entire | E | |
| Isopod, Socorro | Thermosphaeroma thermophilum | Crustaceans | U.S.A. (NM) | Entire | E | |
| Naucorid, Ash Meadows | Ambrysus amargosus | Insects | U.S.A. (NV) | Entire | T | |
| Butterfly, Lange's metalmark | Apodemia mormo langei | Insects | U.S.A. (CA) | Entire | E | |
| Beetle, Coffin Cave mold | Batrisodes texanus | Insects | U.S.A. (TX) | Entire | E | |
| Beetle, Helotes mold | Batrisodes venyivi | Insects | U.S.A. (TX) | Entire | E | |
| Butterfly, Uncompahgre fritillary | Boloria acrocnema | Insects | U.S.A. (CO) | Entire | E | |
| Beetle, Hungerford's crawling water | Brychius hungerfordi | Insects | U.S.A. (MI, Canada) | Entire | E | |
| Butterfly, San Bruno elfin | Callophrys mossii bayensis | Insects | U.S.A. (CA) | Entire | E | |
| Tiger beetle, Northeastern beach | Cicindela dorsalis dorsalis | Insects | U.S.A. (CT, MA, MD, NJ, NY, PA, RI, VA) | Entire | T | |
| Tiger beetle, Salt Creek | Cicindela nevadica lincolniana | Insects | U.S.A. (NE) | Entire | E | |
| Tiger beetle, Ohlone | Cicindela ohlone | Insects | U.S.A. (CA) | Entire | E | |
| Tiger beetle, Puritan | Cicindela puritana | Insects | U.S.A. (CT, MA, MD, NH, VT) | Entire | T | |
| Butterfly, Miami Blue | Cyclargus (=Hemiargus) thomasi bethunebakeri | Insects | U.S.A. (FL) | Entire | E | |
| Butterfly, nickerbean blue | Cyclargus ammon | Insects | Entire | SAT | ||
| Beetle, valley elderberry longhorn | Desmocerus californicus dimorphus | Insects | U.S.A. (CA) | Entire | T | |
| June Beetle, Caseys | Dinacoma caseyi | Insects | U.S.A. (CA) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila aglaia | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila differens | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila hemipeza | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila heteroneura | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila montgomeryi | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila mulli | Insects | U.S.A. (HI) | Entire | T | |
| Pomace fly, [unnamed] | Drosophila musaphilia | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila neoclavisetae | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila obatai | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila ochrobasis | Insects | U.S.A. (HI) | Entire | E | |
| Fly, Hawaiian picture-wing | Drosophila sharpi | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila substenoptera | Insects | U.S.A. (HI) | Entire | E | |
| Pomace fly, [unnamed] | Drosophila tarphytrichia | Insects | U.S.A. (HI) | Entire | E | |
| Beetle, delta green ground | Elaphrus viridis | Insects | U.S.A. (CA) | Entire | T | |
| Butterfly, El Segundo blue | Euphilotes battoides allyni | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Smith's blue | Euphilotes enoptes smithi | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Bay checkerspot | Euphydryas editha bayensis | Insects | U.S.A. (CA) | Entire | T | |
| Butterfly, Quino checkerspot | Euphydryas editha quino (=E. e. wrighti) | Insects | Entire | E | ||
| Moth, Kern primrose sphinx | Euproserpinus euterpe | Insects | U.S.A. (CA) | Entire | T | |
| Butterfly, Palos Verdes blue | Glaucopsyche lygdamus palosverdesensis | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, ceraunus blue | Hemiargus ceraunus antibubastus | Insects | Entire | SAT | ||
| Butterfly, Schaus swallowtail | Heraclides aristodemus ponceanus | Insects | U.S.A. (FL) | Entire | E | |
| Skipper, Pawnee montane | Hesperia leonardus montana | Insects | U.S.A. (CO) | Entire | T | |
| Beetle, Comal Springs riffle | Heterelmis comalensis | Insects | U.S.A. (TX) | Entire | E | |
| Butterfly, Fender's blue | Icaricia icarioides fenderi | Insects | U.S.A. (OR) | Entire | E | |
| Butterfly, mission blue | Icaricia icarioides missionensis | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Mount Charleston blue | Icaricia shasta charlestonensis | Insects | U.S.A. (NV) | Entire | E | |
| Butterfly, cassius blue | Leptotes cassius theonus | Insects | Entire | SAT | ||
| Moth, Blackburn's sphinx | Manduca blackburni | Insects | U.S.A. (HI) | Entire | E | |
| Damselfly, crimson Hawaiian | Megalagrion leptodemas | Insects | U.S.A. (HI) | Entire | E | |
| Damselfly, flying earwig Hawaiian | Megalagrion nesiotes | Insects | U.S.A. (HI) | Entire | E | |
| Damselfly, blackline Hawaiian | Megalagrion nigrohamatum nigrolineatum | Insects | U.S.A. (HI) | Entire | E | |
| Damselfly, oceanic Hawaiian | Megalagrion oceanicum | Insects | U.S.A. (HI) | Entire | E | |
| Damselfly, Pacific Hawaiian | Megalagrion pacificum | Insects | U.S.A. (HI) | Entire | E | |
| Butterfly, Saint Francis' satyr | Neonympha mitchellii francisci | Insects | U.S.A. (NC) | Entire | E | |
| Butterfly, Mitchell's satyr | Neonympha mitchellii mitchellii | Insects | U.S.A. (IN, MI, NJ, OH) | Entire | E | |
| Beetle, American burying | Nicrophorus americanus | Insects | U.S.A. (eastern States south to FL, west to SD and TX), eastern Canada | Entire, except where listed as an experimental population | E | |
| Butterfly, Luzon peacock swallowtail | Papilio chikae | Insects | Philippines | Entire | E | |
| Butterfly, Homerus swallowtail | Papilio homerus | Insects | Jamaica | Entire | E | |
| Butterfly, Corsican swallowtail | Papilio hospiton | Insects | Corsica, Sardinia | Entire | E | |
| Butterfly, lotis blue | Plebejus idas lotis | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Karner blue | Plebejus melissa samuelis | Insects | U.S.A. (IL, IN, MA, MI, MN, NH, NY, OH, PA, WI), Canada (Ont.) | Entire | E | |
| Beetle, Mount Hermon June | Polyphylla barbata | Insects | U.S.A. (CA) | Entire | E | |
| Skipper, Carson wandering | Pseudocopaeodes eunus obscurus | Insects | U.S.A. (CA, NV) | U.S.A., (Lassen County, CA; Washoe County, NV) | E | |
| Skipper, Laguna Mountains | Pyrgus ruralis lagunae | Insects | U.S.A. (CA) | Entire | E | |
| Ground beetle, [unnamed] | Rhadine exilis | Insects | U.S.A. (TX) | Entire | E | |
| Ground beetle, [unnamed] | Rhadine infernalis | Insects | U.S.A. (TX) | Entire | E | |
| Beetle, Tooth Cave ground | Rhadine persephone | Insects | U.S.A. (TX) | Entire | E | |
| Fly, Delhi Sands flower-loving | Rhaphiomidas terminatus abdominalis | Insects | U.S.A. (CA) | Entire | E | |
| Dragonfly, Hine's emerald | Somatochlora hineana | Insects | U.S.A. (IL, IN, OH, WI) | Entire | E | |
| Butterfly, callippe silverspot | Speyeria callippe callippe | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Behren's silverspot | Speyeria zerene behrensii | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Oregon silverspot | Speyeria zerene hippolyta | Insects | U.S.A. (CA, OR, WA) | Entire | T | |
| Butterfly, Myrtle's silverspot | Speyeria zerene myrtleae | Insects | U.S.A. (CA) | Entire | E | |
| Beetle, Comal Springs dryopid | Stygoparnus comalensis | Insects | U.S.A. (TX) | Entire | E | |
| Beetle, Kretschmarr Cave mold | Texamaurops reddelli | Insects | U.S.A. (TX) | Entire | E | |
| Grasshopper, Zayante band-winged | Trimerotropis infantilis | Insects | U.S.A. (CA) | Entire | E | |
| Butterfly, Queen Alexandra's birdwing | Troides alexandrae | Insects | Papua New Guinea | Entire | E |