Collection Summary
Nerodia rhombifer (Northern Diamond-backed Watersnake) has a total of 377 valid, non-duplicated collections representing 40 counties and 136 localities. There are a total of 58 collectors and 147 collection dates for the species. This results in a total of 160 expeditions for the species, a measure of unique date / collector(s) combinations. The earliest collection year for the species in Missouri is 1891 and its most recent collection year is 2025. The earliest and latest collection dates (independent of earliest and most recent collection years) are March 7 and October 30, respectively. If you have a new record to report, read the New Records section of the FAQ.
Collection Summary by County
| County | Localities | Collections | Collectors | Dates | Expeditions | Earliest Year | Latest Year | |
|---|---|---|---|---|---|---|---|---|
 | Barton | 3 | 70 | 2 | 3 | 3 | 1935 | 2024 |
| Bates | 1 | 1 | 1 | 1 | 1 | 1982 | 1982 |
| Benton | 1 | 1 | 1 | 1 | 1 | 1967 | 1967 |
| Bollinger | 7 | 14 | 10 | 12 | 12 | 1936 | 1995 |
| Butler | 3 | 10 | 7 | 7 | 8 | 1898 | 1970 |
| Cape Girardeau | 1 | 1 | 1 | 1 | 1 | 1962 | 1962 |
| Carroll | 3 | 3 | 3 | 3 | 3 | 1992 | 2015 |
| Cass | 1 | 1 | 2 | 1 | 1 | 2004 | 2004 |
| Chariton | 12 | 13 | 3 | 12 | 12 | 1938 | 2024 |
| Clark | 2 | 4 | 2 | 2 | 2 | 2013 | 2013 |
| Clay | 3 | 3 | 3 | 3 | 3 | 1965 | 1967 |
| Dunklin | 9 | 23 | 9 | 14 | 14 | 1904 | 1970 |
| Grundy | 2 | 2 | 1 | 2 | 2 | 1964 | 1964 |
| Henry | 1 | 1 | 1 | 1 | 1 | 1938 | 1938 |
| Holt | 13 | 34 | 8 | 26 | 27 | 1939 | 2025 |
| Jackson | 1 | 1 | 1 | 1 | 1 | 1943 | 1943 |
| Jasper | 3 | 4 | 4 | 4 | 4 | 1899 | 2022 |
| Jefferson | 2 | 2 | 1 | 1 | 1 | ||
| Johnson | 4 | 9 | 6 | 7 | 7 | 1960 | 1982 |
| Lewis | 1 | 1 | 1 | 1 | 1 | 1940 | 1940 |
| Lincoln | 2 | 2 | 2 | 2 | 2 | 2015 | 2015 |
| Linn | 1 | 1 | 1 | 1 | 1 | 1960 | 1960 |
| Livingston | 4 | 34 | 3 | 4 | 4 | 1940 | 2020 |
| Macon | 1 | 1 | 1 | 1 | 1 | 1962 | 1962 |
| McDonald | 1 | 2 | 1 | 1 | 1 | 1930 | 1930 |
| Mississippi | 11 | 41 | 6 | 8 | 9 | 1936 | 1984 |
| New Madrid | 2 | 2 | 2 | 2 | 2 | 1937 | 1961 |
| Nodaway | 2 | 2 | 2 | 2 | 2 | 1977 | 2012 |
| Pemiscot | 4 | 6 | 3 | 3 | 4 | 1923 | 1962 |
| Perry | 1 | 1 | 2 | 1 | 1 | 2016 | 2016 |
| Pike | 3 | 6 | 2 | 5 | 5 | 1992 | 2002 |
| Ray | 1 | 1 | 1 | 1 | 1 | 1994 | 1994 |
| Ripley | 1 | 2 | 1 | 1 | 1 | ||
| Saint Charles | 2 | 4 | 3 | 3 | 3 | 1906 | 1990 |
| Saint Clair | 1 | 1 | 1 | 1 | 1 | 1976 | 1976 |
| Saint Louis | 3 | 5 | 3 | 3 | 4 | 1891 | 1961 |
| Scott | 2 | 2 | 3 | 2 | 2 | 1962 | 2011 |
| Stoddard | 12 | 25 | 16 | 16 | 19 | 1939 | 2023 |
| Vernon | 6 | 38 | 4 | 8 | 8 | 1937 | 2016 |
| Wayne | 3 | 3 | 7 | 3 | 3 | 1966 | 2001 |