Collection Summary
Cryptobranchus alleganiensis (Hellbender) has a total of 280 valid, non-duplicated collections representing 19 counties and 77 localities. There are a total of 53 collectors and 87 collection dates for the species. This results in a total of 95 expeditions for the species, a measure of unique date / collector(s) combinations. The earliest collection year for the species in Missouri is 1896 and its most recent collection year is 2007. The earliest and latest collection dates (independent of earliest and most recent collection years) are January 10 and November 14, 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 | |
|---|---|---|---|---|---|---|---|---|
 | Camden | 2 | 3 | 1 | 2 | 2 | 1934 | 1946 |
| Carter | 3 | 9 | 7 | 7 | 7 | 1930 | 1967 |
| Crawford | 3 | 10 | 2 | 4 | 4 | 1975 | 1987 |
| Dallas | 15 | 67 | 11 | 19 | 20 | 1953 | 1986 |
| Dent | 1 | 2 | 2 | 2 | 2 | 1909 | 1932 |
| Douglas | 2 | 2 | 2 | 2 | 2 | 1948 | 1969 |
| Franklin | 2 | 2 | 2 | 2 | 2 | 2004 | 2004 |
| Gasconade | 1 | 1 | 4 | 1 | 1 | 2006 | 2006 |
| Jefferson | 1 | 1 | 1 | 1 | 1 | ||
| Laclede | 4 | 6 | 5 | 3 | 5 | 1956 | 2002 |
| Maries | 1 | 1 | 4 | 1 | 1 | 2007 | 2007 |
| Oregon | 7 | 24 | 10 | 9 | 10 | 1900 | 1990 |
| Osage | 1 | 1 | 1 | 1 | 1 | 1983 | 1983 |
| Ozark | 12 | 92 | 12 | 19 | 20 | 1964 | 2006 |
| Phelps | 3 | 6 | 3 | 5 | 5 | 1896 | 1986 |
| Pulaski | 7 | 22 | 6 | 7 | 7 | 1950 | 1987 |
| Ripley | 1 | 1 | 3 | 1 | 1 | 2004 | 2004 |
| Shannon | 3 | 5 | 3 | 3 | 3 | 1962 | 1988 |
| Texas | 5 | 11 | 7 | 5 | 5 | 1953 | 2003 |