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Agkistrodon piscivorus (Lacépède, 1789) - Northern Cottonmouth

Maps

Locality Map

Locality map for Agkistrodon piscivorus (Northern Cottonmouth)
Locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

County Map

County map for Agkistrodon piscivorus (Northern Cottonmouth)
County map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Historical Locality Map

Historical locality map for Agkistrodon piscivorus (Northern Cottonmouth)
Historical locality map for Agkistrodon piscivorus (Northern Cottonmouth). Black circles ( ) represent records after 1986, blue squares ( ) represent records between 1966 and 1986, orange triangles ( ) represent records prior to 1966. Note that more recent records might conceal underlying older records.
Map created 15 April 2026.

Historical County Map

Historical county map for Agkistrodon piscivorus (Northern Cottonmouth)
Historical county map for Agkistrodon piscivorus (Northern Cottonmouth). Black circles ( ) represent records after 1986, blue squares ( ) represent records between 1966 and 1986, orange triangles ( ) represent records prior to 1966. Note that only the most recent county record for each county is shown.
Map created 15 April 2026.

Ecological Drainage Locality Map

Ecological Drainage Units map for Agkistrodon piscivorus (Northern Cottonmouth)
Ecological Drainage Units locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Natural Divisions Locality Map

Natural Divisions locality map for Agkistrodon piscivorus (Northern Cottonmouth)
Natural Divisions and Sections locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Major Watersheds Locality Map

Major watersheds map for Agkistrodon piscivorus (Northern Cottonmouth)
Major Watersheds locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Level I Ecoregion Locality Map

Level I Ecoregions map for Agkistrodon piscivorus (Northern Cottonmouth)
Level I Ecoregion locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Level II Ecoregion Locality Map

Level II Ecoregions map for Agkistrodon piscivorus (Northern Cottonmouth)
Level II Ecoregion locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Level III Ecoregion Locality Map

Level III Ecoregions map for Agkistrodon piscivorus (Northern Cottonmouth)
Level III Ecoregion locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Level IV Ecoregion Locality Map

Level IV Ecoregions map for Agkistrodon piscivorus (Northern Cottonmouth)
Level IV Ecoregion locality map for Agkistrodon piscivorus (Northern Cottonmouth).
Map created 15 April 2026.

Native Status

Agkistrodon piscivorus (Northern Cottonmouth) is native to Missouri.

Collection Summary

Agkistrodon piscivorus (Northern Cottonmouth) has a total of 233 valid, non-duplicated collections representing 32 counties and 110 localities. There are a total of 73 collectors and 103 collection dates for the species. This results in a total of 112 expeditions for the species, a measure of unique date / collector(s) combinations. The earliest collection year for the species in Missouri is 1897 and its most recent collection year is 2025. The earliest and latest collection dates (independent of earliest and most recent collection years) are March 14 and November 28, respectively. If you have a new record to report, read the New Records section of the FAQ.

Collection Summary by County

Collection summary for Agkistrodon piscivorus (Northern Cottonmouth) by county. Some values are unavailable since some records are represented solely by historical literature reports, which sometimes lack complete collecting data. Click on a county name to view more information about that county. Click on column headings to sort by that column.
County Localities Collections Collectors Dates Expeditions Earliest Year Latest Year
Barry 4 4 2 3 3 2007 2020
Bollinger 4 12 7 6 7 1935 2012
Butler 4 10 4 4 5 1897 1909
Camden 3 3 3 3 3 1982 2023
Cape Girardeau 1 1 1 1 1
Crawford 1 1 1 1 1
Dent 1 17 2 2 2 1909 1909
Dunklin 3 4 3 3 3 1904 1959
Henry 1 1 1 1 1 2007 2007
Hickory 2 2 2 2 2 1983 2023
Iron 1 1 1 1 1 1973 1973
Jefferson 1 1 1 1 1
Lawrence 2 2 3 2 2 1991 2024
Madison 4 5 5 4 4 1973 2024
Miller 7 47 5 8 8 1939 1975
Oregon 1 1 1 1 1 1956 1956
Ozark 2 2 5 2 2 2007 2010
Phelps 1 1 1 1 1 2022 2022
Pulaski 3 3 5 2 3 1986 2022
Ripley 3 3 4 3 3 1939 2008
Saint Clair 3 5 3 3 3 1943 2009
Sainte Genevieve 1 1 1 1 1 2012 2012
Saint Louis 2 2 1 1 1 1995 1995
Scott 1 1 1 1 1 2001 2001
Shannon 6 8 7 7 7 1960 2025
Stoddard 22 65 19 30 33 1935 2024
Stone 5 5 7 5 5 2006 2020
Taney 2 2 2 2 2 1971 2014
Texas 2 2 7 2 2 1980 2003
Washington 1 1 1 1 1 1984 1984
Wayne 12 16 7 14 14 1935 2025
Wright 2 2 2 2 2 2004 2004

Potential County Records

Potential counties for Agkistrodon piscivorus (Northern Cottonmouth). Counties are listed in descending order of their likelihood of having this species. Click on a county to view more information about that county. Click on column headings to sort by that column.
Likelihood County Rationale Ecoregion / Watershed
2 Benton Same watershed, within 5 miles Harry S. Truman Reservoir
2 Christian Same watershed, within 5 miles Sac
2 Dallas Same watershed, within 5 miles Niangua
2 Greene Same watershed, within 5 miles Sac
2 Howell Same watershed, within 5 miles Current
2 Howell Same watershed, within 5 miles Eleven Point
2 Laclede Same watershed, within 5 miles Upper Gasconade
2 Laclede Same watershed, within 5 miles Niangua
2 Maries Same watershed, within 5 miles Lower Gasconade
2 Pemiscot Same watershed, within 5 miles Little River Ditches
2 Saint Francois Same watershed, within 5 miles Upper St. Francis
4 Cedar Same watershed, within 10 miles Sac
4 Dade Same watershed, within 10 miles Sac
4 Reynolds Same watershed, within 10 miles Upper St. Francis
6 Bates Same watershed, within 20 miles Harry S. Truman Reservoir
6 Bates Same watershed, within 20 miles South Grand
6 Carter Same watershed, within 20 miles Upper Black
6 Carter Same watershed, within 20 miles Eleven Point
6 Carter Same watershed, within 20 miles Current
6 Cass Same watershed, within 20 miles South Grand
6 Cole Same watershed, within 20 miles Lower Osage
6 Douglas Same watershed, within 20 miles North Fork White
6 Douglas Same watershed, within 20 miles Bull Shoals Lake
6 Franklin Same watershed, within 20 miles Big
6 Franklin Same watershed, within 20 miles Meramec
6 Johnson Same watershed, within 20 miles South Grand
6 Morgan Same watershed, within 20 miles Lower Osage
6 New Madrid Same watershed, within 20 miles Little River Ditches
6 Osage Same watershed, within 20 miles Lower Osage
6 Pettis Same watershed, within 20 miles South Grand
6 Polk Same watershed, within 20 miles Sac
6 Polk Same watershed, within 20 miles Harry S. Truman Reservoir
6 Vernon Same watershed, within 20 miles Harry S. Truman Reservoir
6 Vernon Same watershed, within 20 miles Sac
6 Webster Same watershed, within 20 miles Upper Gasconade
8 Barton Same watershed, within 30 miles Sac
8 Gasconade Same watershed, within 30 miles Lower Gasconade
10 Perry Adjacent county, same watershed Whitewater

Linnaean Classification

Kingdom:
Animalia - Animals
Phylum:
Chordata - Chordates
Subphylum:
Vertebrata - Vertebrates
Class:
Reptilia Laurenti, 1768 - Reptiles
Order:
Squamata Oppel, 1811 - Lizards and Snakes
Family:
Crotalidae Oppel, 1811 - Pit Vipers
Genus:
Agkistrodon Palisot de Beauvois, 1799 - American Moccasins
Species:
Agkistrodon piscivorus (Lacépède, 1789) - Northern Cottonmouth

Recent Taxonomic Synonyms

(none)