Williams County
Known species: 111
Total Observations: 2,479
Population: 37,500
Area in Square Miles: 421
People per Square Mile: 89
Observations per Square Mile: 5.9
County iNaturalist observations
The Observed Species table provides statistical data on all odonata species that have been observed in the county. Below that is a Target Species table listing species that have not yet been documented in this county, but are likely to exist in the county. This list is data-driven by listing species records from neighboring counties.
Observed Species
Common Name | Scientific Name | Williams Total | Ohio Total | Williams 2023 | Last Sighted |
|---|---|---|---|---|---|
| Arrow Clubtail | Stylurus spiniceps | 115 | 305 | 0 | 2021 |
| Lance-tipped Darner | Aeshna constricta | 92 | 358 | 0 | 1997 |
| Slaty Skimmer | Libellula incesta | 79 | 4,032 | 12 | 2023 |
| Eastern Pondhawk | Erythemis simplicicollis | 74 | 13,870 | 14 | 2023 |
| Eastern Forktail | Ischnura verticalis | 74 | 13,326 | 7 | 2023 |
| Widow Skimmer | Libellula luctuosa | 72 | 10,352 | 12 | 2023 |
| Smoky Rubyspot | Hetaerina titia | 68 | 346 | 6 | 2023 |
| Common Baskettail | Epitheca cynosura | 67 | 748 | 1 | 2023 |
| Autumn Meadowhawk | Sympetrum vicinum | 65 | 6,971 | 1 | 2023 |
| Lancet Clubtail | Phanogomphus exilis | 63 | 1,518 | 9 | 2023 |
| Blue Dasher | Pachydiplax longipennis | 60 | 13,169 | 11 | 2023 |
| Banded Pennant | Celithemis fasciata | 57 | 684 | 12 | 2023 |
| Spangled Skimmer | Libellula cyanea | 55 | 1,037 | 7 | 2023 |
| Dot-tailed Whiteface | Leucorrhinia intacta | 55 | 1,357 | 6 | 2023 |
| Midland Clubtail | Gomphurus fraternus | 49 | 802 | 0 | 2021 |
| Halloween Pennant | Celithemis eponina | 48 | 3,628 | 8 | 2023 |
| Skimming Bluet | Enallagma geminatum | 47 | 3,109 | 1 | 2023 |
| Familiar Bluet | Enallagma civile | 46 | 5,111 | 1 | 2023 |
| Pronghorn Clubtail | Phanogomphus graslinellus | 46 | 451 | 0 | 1961 |
| Common Sanddragon | Progomphus obscurus | 43 | 141 | 0 | 1956 |
| Ebony Jewelwing | Calopteryx maculata | 39 | 7,169 | 1 | 2023 |
| Eastern Amberwing | Perithemis tenera | 37 | 8,819 | 5 | 2023 |
| Ruby Meadowhawk | Sympetrum rubicundulum | 37 | 942 | 0 | 2021 |
| Common Green Darner | Anax junius | 36 | 4,146 | 3 | 2023 |
| Fragile Forktail | Ischnura posita | 35 | 10,727 | 3 | 2023 |
| Common Whitetail | Plathemis lydia | 35 | 9,898 | 3 | 2023 |
| Canada Darner | Aeshna canadensis | 34 | 41 | 0 | 1997 |
| Chalk-fronted Corporal | Ladona julia | 33 | 59 | 1 | 2023 |
| Dusky Clubtail | Phanogomphus spicatus | 32 | 191 | 1 | 2023 |
| Stream Bluet | Enallagma exsulans | 31 | 4,097 | 1 | 2023 |
| Slender Spreadwing | Lestes rectangularis | 30 | 3,492 | 5 | 2023 |
| Boreal Bluet | Enallagma boreale | 28 | 44 | 0 | 1953 |
| Violet Dancer | Argia fumipennis violacea | 27 | 6,247 | 2 | 2023 |
| Blue-tipped Dancer | Argia tibialis | 27 | 3,785 | 1 | 2023 |
| Calico Pennant | Celithemis elisa | 26 | 2,752 | 0 | 2022 |
| Ashy Clubtail | Phanogomphus lividus | 25 | 874 | 1 | 2023 |
| Northern Bluet | Enallagma annexum | 25 | 65 | 0 | 1953 |
| Mottled Darner | Aeshna clepsydra | 25 | 31 | 0 | 1996 |
| Lilypad Clubtail | Arigomphus furcifer | 23 | 113 | 7 | 2023 |
| Sedge Sprite | Nehalennia irene | 23 | 359 | 0 | 2019 |
| White-faced Meadowhawk | Sympetrum obtrusum | 22 | 272 | 0 | 1997 |
| American Rubyspot | Hetaerina americana | 21 | 3,761 | 2 | 2023 |
| Black Saddlebags | Tramea lacerata | 21 | 2,839 | 0 | 2021 |
| Prince Baskettail | Epitheca princeps | 20 | 2,390 | 2 | 2023 |
| Royal River Cruiser | Macromia taeniolata | 20 | 536 | 2 | 2023 |
| Blue-fronted Dancer | Argia apicalis | 20 | 5,692 | 1 | 2023 |
| Twelve-spotted Skimmer | Libellula pulchella | 20 | 3,377 | 1 | 2023 |
| Skillet Clubtail | Gomphurus ventricosus | 19 | 26 | 0 | 1962 |
| Westfall's Slender Bluet | Enallagma traviatum westfalli | 18 | 1,991 | 1 | 2023 |
| Swift River Cruiser | Macromia illinoiensis | 18 | 688 | 0 | 2022 |
| Double-striped Bluet | Enallagma basidens | 17 | 4,313 | 1 | 2023 |
| Swamp Spreadwing | Lestes vigilax | 17 | 544 | 1 | 2023 |
| Hagen's Bluet | Enallagma hageni | 17 | 84 | 0 | 2019 |
| Unicorn Clubtail | Arigomphus villosipes | 15 | 1,687 | 2 | 2023 |
| Spatterdock Darner | Rhionaeschna mutata | 14 | 335 | 1 | 2023 |
| Shadow Darner | Aeshna umbrosa | 14 | 1,031 | 0 | 1996 |
| Fawn Darner | Boyeria vinosa | 14 | 440 | 0 | 1993 |
| Elegant Spreadwing | Lestes inaequalis | 12 | 479 | 3 | 2023 |
| Aurora Damsel | Chromagrion conditum | 12 | 471 | 0 | 1961 |
| Green-striped Darner | Aeshna verticalis | 12 | 262 | 0 | 1961 |
| Saffron-winged Meadowhawk | Sympetrum costiferum | 12 | 20 | 0 | 2021 |
| Orange Bluet | Enallagma signatum | 11 | 3,184 | 1 | 2023 |
| Rapids Clubtail | Phanogomphus quadricolor | 11 | 287 | 0 | 1951 |
| Comet Darner | Anax longipes | 10 | 515 | 2 | 2023 |
| Azure Bluet | Enallagma aspersum | 10 | 2,115 | 1 | 2023 |
| Lilypad Forktail | Ischnura kellicotti | 10 | 733 | 0 | 2022 |
| Wandering Glider | Pantala flavescens | 9 | 1,241 | 0 | 2021 |
| Marsh Bluet | Enallagma ebrium | 9 | 66 | 0 | 2021 |
| Riverine Clubtail | Stylurus amnicola | 9 | 15 | 0 | 1959 |
| Springtime Darner | Basiaeschna janata | 8 | 298 | 1 | 2023 |
| Laura's Clubtail | Stylurus laurae | 8 | 50 | 0 | 1960 |
| Vesper Bluet | Enallagma vesperum | 7 | 740 | 2 | 2023 |
| Rainbow Bluet | Enallagma antennatum | 7 | 458 | 0 | 2019 |
| Cyrano Darner | Nasiaeschna pentacantha | 7 | 277 | 0 | 2020 |
| Cherry-faced Meadowhawk | Sympetrum internum | 7 | 14 | 0 | 2022 |
| Citrine Forktail | Ischnura hastata | 6 | 899 | 1 | 2023 |
| Powdered Dancer | Argia moesta | 6 | 4,247 | 0 | 1959 |
| Blue-ringed Dancer | Argia sedula | 6 | 2,364 | 0 | 1961 |
| Eastern Red Damsel | Amphiagrion saucium | 6 | 1,230 | 0 | 1955 |
| Band-winged Meadowhawk | Sympetrum semicinctum | 6 | 860 | 0 | 1961 |
| Flag-tailed Spinyleg | Dromogomphus spoliatus | 6 | 743 | 0 | 2021 |
| Spotted Spreadwing | Lestes congener | 6 | 731 | 0 | 2021 |
| Amber-winged Spreadwing | Lestes eurinus | 6 | 610 | 0 | 2020 |
| Southern Spreadwing | Lestes australis | 6 | 255 | 0 | 1997 |
| Arrowhead Spiketail | Cordulegaster obliqua | 6 | 172 | 0 | 1959 |
| Carolina Saddlebags | Tramea carolina | 4 | 1,048 | 0 | 2021 |
| Dragonhunter | Hagenius brevistylus | 4 | 439 | 0 | 2019 |
| Rusty Snaketail | Ophiogomphus rupinsulensis | 4 | 245 | 0 | 1961 |
| Mocha Emerald | Somatochlora linearis | 3 | 192 | 0 | 1984 |
| River Jewelwing | Calopteryx aequabilis | 3 | 77 | 0 | 1951 |
| Dusky Dancer | Argia translata | 2 | 1,376 | 0 | 2020 |
| Turquoise Bluet | Enallagma divagans | 2 | 768 | 0 | 2019 |
| Black-shouldered Spinyleg | Dromogomphus spinosus | 2 | 542 | 0 | 1991 |
| Emerald Spreadwing | Lestes dryas | 2 | 479 | 0 | 1997 |
| Sphagnum Sprite | Nehalennia gracilis | 2 | 370 | 0 | 1962 |
| Lyre-tipped Spreadwing | Lestes unguiculatus | 2 | 180 | 0 | 1951 |
| Black-tipped Darner | Aeshna tuberculifera | 2 | 141 | 0 | 1957 |
| Delta-spotted Spiketail | Cordulegaster diastatops | 2 | 131 | 0 | 2008 |
| Elusive Clubtail | Stylurus notatus | 2 | 101 | 0 | 1946 |
| Hine's Emerald | Somatochlora hineana | 2 | 24 | 0 | 1956 |
| Painted Skimmer | Libellula semifasciata | 1 | 1,056 | 0 | 1950 |
| Swamp Darner | Epiaeschna heros | 1 | 620 | 0 | 1950 |
| Spot-winged Glider | Pantala hymenaea | 1 | 478 | 0 | 1950 |
| Great Blue Skimmer | Libellula vibrans | 1 | 467 | 0 | 1962 |
| Sweetflag Spreadwing | Lestes forcipatus | 1 | 443 | 0 | 1950 |
| Russet-tipped Clubtail | Stylurus plagiatus | 1 | 307 | 0 | 1947 |
| Four-spotted Skimmer | Libellula quadrimaculata | 1 | 285 | 0 | 1953 |
| Plains Clubtail | Gomphurus externus | 1 | 189 | 0 | 1992 |
| Northern Spreadwing | Lestes disjunctus | 1 | 24 | 0 | 2022 |
| Plains Emerald | Somatochlora ensigera | 1 | 18 | 0 | 1949 |
| Variable Darner | Aeshna interrupta | 1 | 1 | 0 | 1951 |
Target Species
Target species are potential County Records - species not yet documented in the county. 'Local Obs' is Local Observations and indicates the number of times that the species has been observed in adjacent counties since 2000, and '# of Counties' is the number of adjacent counties in which those recent observations took place. Zero local observations or recent counties means the existing records are historical. 'Peak Active' is a relative description of when the species has been known to fly.| Common Name | Scientific Name | Ohio Obs | Local Obs | # of Counties | Peak Active |
|---|---|---|---|---|---|
| Macromia Hybrid | Macromia pacifica x taeniolata | 90 | 4 | 2 | late Jul-mid Aug |
| Cobra Clubtail | Gomphurus vastus | 377 | 1 | 1 | Jun |
| Red Saddlebags | Tramea onusta | 145 | 1 | 1 | Jun-Jul |
| Blue-faced Meadowhawk | Sympetrum ambiguum | 1,204 | 0 | 0 | late Aug-mid Sep |
| Tule Bluet | Enallagma carunculatum | 498 | 0 | 0 | Jun-Jul |
| Handsome Clubtail | Gomphurus crassus | 170 | 0 | 0 | late May-early Jun |
| Variegated Meadowhawk | Sympetrum corruptum | 117 | 0 | 0 | Apr-Sep |
| Gilded River Cruiser | Macromia pacifica | 73 | 0 | 0 | late Jul |
| Wabash River Cruiser | Macromia wabashensis | 25 | 0 | 0 | Aug |
Williams County is located in the extreme NW corner of Ohio, bordering both Ohio and Indiana. Most of the county is within the Till Plains ecoregion. The SE corner is lies within the Maumee Lake Plains area of the Huron-Erie Lake Plains ecoregion, which was the location of the now mostly-drained and channelized Black Swamp. See p. 11 in Ohio Coastal Atlas: Chapter 2 for a detailed watershed map.
County Observation Activity
This graph shows the total number of odonata observations for the county in brown, with the average for all Ohio counties in blue. The season is divided into 10 or 11 day segments by Month – basically early-month, mid-month, and late-month.
Page updated 18 January 2024