Collection Summary
Ambystoma opacum (Marbled Salamander) has a total of 215 valid, non-duplicated collections representing 48 counties and 111 localities. There are a total of 98 collectors and 130 collection dates for the species. This results in a total of 143 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 2023. The earliest and latest collection dates (independent of earliest and most recent collection years) are January 5 and November 20, 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 | |
|---|---|---|---|---|---|---|---|---|
 | Bollinger | 2 | 8 | 5 | 5 | 6 | 1969 | 1995 |
| Butler | 5 | 19 | 7 | 9 | 12 | 1897 | 1998 |
| Callaway | 1 | 1 | 2 | 1 | 1 | 1995 | 1995 |
| Camden | 1 | 1 | 1 | 1 | 1 | 2013 | 2013 |
| Cape Girardeau | 2 | 2 | 3 | 2 | 2 | 2016 | 2016 |
| Carter | 3 | 4 | 3 | 3 | 3 | 1984 | 2001 |
| Christian | 3 | 3 | 4 | 3 | 3 | 1987 | 2013 |
| Crawford | 3 | 3 | 6 | 3 | 3 | 1992 | 2013 |
| Dallas | 1 | 1 | 8 | 1 | 1 | 2022 | 2022 |
| Dent | 1 | 2 | 1 | 1 | 1 | 1991 | 1991 |
| Douglas | 1 | 1 | 2 | 1 | 1 | 2008 | 2008 |
| Dunklin | 2 | 8 | 3 | 3 | 4 | 1905 | 1957 |
| Franklin | 1 | 1 | 1 | 1 | 1 | 1931 | 1931 |
| Gasconade | 2 | 3 | 4 | 2 | 3 | 1975 | 2015 |
| Greene | 1 | 2 | 2 | 1 | 1 | 2023 | 2023 |
| Howell | 2 | 2 | 2 | 2 | 2 | 2004 | 2021 |
| Iron | 2 | 2 | 4 | 2 | 2 | 2002 | 2020 |
| Jefferson | 2 | 7 | 5 | 4 | 5 | 1932 | 2023 |
| Laclede | 1 | 2 | 1 | 1 | 1 | 1991 | 1991 |
| Lincoln | 2 | 4 | 2 | 4 | 4 | 1978 | 2012 |
| Madison | 2 | 2 | 1 | 1 | 1 | 2012 | 2012 |
| Maries | 1 | 1 | 2 | 1 | 1 | 1990 | 1990 |
| McDonald | 1 | 1 | 2 | 1 | 1 | 2020 | 2020 |
| Montgomery | 2 | 4 | 2 | 3 | 3 | 1992 | 2004 |
| New Madrid | 1 | 5 | 2 | 3 | 3 | 1903 | 1909 |
| Oregon | 2 | 2 | 3 | 2 | 2 | 1986 | 1986 |
| Osage | 2 | 2 | 2 | 2 | 2 | 1993 | 1997 |
| Ozark | 1 | 1 | 2 | 1 | 1 | 2005 | 2005 |
| Pemiscot | 1 | 2 | 2 | 2 | 2 | 1903 | 1903 |
| Perry | 1 | 1 | 1 | 1 | 1 | 2005 | 2005 |
| Phelps | 7 | 12 | 13 | 8 | 9 | 1941 | 2015 |
| Pulaski | 2 | 3 | 2 | 2 | 2 | 1995 | 2001 |
| Randolph | 3 | 5 | 2 | 3 | 3 | 2018 | 2023 |
| Reynolds | 1 | 1 | 1 | 1 | 1 | 1981 | 1981 |
| Ripley | 3 | 3 | 3 | 3 | 3 | 2000 | 2020 |
| Saint Charles | 1 | 1 | 1 | 1 | 1 | 2013 | 2013 |
| Saint Clair | 2 | 2 | 2 | 2 | 2 | 1970 | 1970 |
| Sainte Genevieve | 1 | 1 | 1 | 1 | 1 | 2011 | 2011 |
| Saint Francois | 2 | 2 | 5 | 1 | 2 | 2008 | 2008 |
| Saint Louis | 4 | 15 | 5 | 8 | 8 | 1898 | 1992 |
| Shannon | 2 | 2 | 1 | 1 | 1 | 1934 | 1934 |
| Stoddard | 11 | 48 | 18 | 28 | 29 | 1897 | 2014 |
| Taney | 4 | 4 | 9 | 2 | 3 | 2007 | 2007 |
| Texas | 1 | 2 | 1 | 1 | 1 | 2003 | 2003 |
| Warren | 1 | 2 | 1 | 1 | 1 | 1980 | 1980 |
| Washington | 3 | 4 | 4 | 3 | 3 | 1990 | 2020 |
| Wayne | 6 | 6 | 10 | 6 | 6 | 1968 | 2003 |
| Webster | 3 | 3 | 1 | 2 | 2 | 2002 | 2016 |