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Tantilla gracilis Baird and Girard, 1853 - Flat-headed Snake

Maps

Locality Map

Locality map for Tantilla gracilis (Flat-headed Snake)
Locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

County Map

County map for Tantilla gracilis (Flat-headed Snake)
County map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Historical Locality Map

Historical locality map for Tantilla gracilis (Flat-headed Snake)
Historical locality map for Tantilla gracilis (Flat-headed Snake). 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 8 April 2021.

Historical County Map

Historical county map for Tantilla gracilis (Flat-headed Snake)
Historical county map for Tantilla gracilis (Flat-headed Snake). 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 8 April 2021.

Ecological Drainage Locality Map

Ecological Drainage Units map for Tantilla gracilis (Flat-headed Snake)
Ecological Drainage Units locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Natural Divisions Locality Map

Natural Divisions locality map for Tantilla gracilis (Flat-headed Snake)
Natural Divisions and Sections locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Major Watersheds Locality Map

Major watersheds map for Tantilla gracilis (Flat-headed Snake)
Major Watersheds locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Level I Ecoregion Locality Map

Level I Ecoregions map for Tantilla gracilis (Flat-headed Snake)
Level I Ecoregion locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Level II Ecoregion Locality Map

Level II Ecoregions map for Tantilla gracilis (Flat-headed Snake)
Level II Ecoregion locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Level III Ecoregion Locality Map

Level III Ecoregions map for Tantilla gracilis (Flat-headed Snake)
Level III Ecoregion locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Level IV Ecoregion Locality Map

Level IV Ecoregions map for Tantilla gracilis (Flat-headed Snake)
Level IV Ecoregion locality map for Tantilla gracilis (Flat-headed Snake).
Map created 8 April 2021.

Native Status

Tantilla gracilis (Flat-headed Snake) is native to Missouri.

Collection Summary

Tantilla gracilis (Flat-headed Snake) has a total of 406 valid, non-duplicated collections representing 44 counties and 155 localities. There are a total of 110 collectors and 152 collection dates for the species. This results in a total of 179 expeditions for the species, a measure of unique date / collector(s) combinations. The earliest collection year for the species in Missouri is 1892 and its most recent collection year is 2017. The earliest and latest collection dates (independent of earliest and most recent collection years) are March 7 and October 24, respectively. If you have a new record to report, read the New Records section of the FAQ.

Collection Summary by County

Collection summary for Tantilla gracilis (Flat-headed Snake) 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 11 28 6 9 9 1930 1976
Benton 7 46 5 7 7 1958 2012
Camden 4 5 3 4 5 1948 1978
Carter 2 2 4 2 2 2002 2005
Christian 5 6 9 6 6 1962 1993
Crawford 1 1 1 1 1 1965 1965
Dade 2 2 1 2 2 1985 1993
Dallas 1 1 2 1 1 2000 2000
Dent 1 1 2 1 1 2003 2003
Franklin 1 2 1 1 1 1934 1934
Gasconade 1 1 1 1 1
Greene 5 29 6 7 7 1959 2013
Henry 2 2 2 2 2 1982 1982
Hickory 1 1 1 1 1 1985 1985
Iron 4 4 5 3 3 1962 2009
Jackson 2 3 1 2 2 1938 1938
Jasper 1 1 1 1 1 2003 2003
Jefferson 16 58 26 20 33 1895 1987
Laclede 1 2 1 1 1 1939 1939
Madison 2 2 7 2 2 2007 2007
Maries 1 1 1 1 1 2000 2000
McDonald 5 8 4 6 6 1937 1978
Miller 2 3 2 3 3 1965 1973
Moniteau 2 3 4 2 2 1966 2012
Montgomery 3 4 6 3 4 1992 2015
Morgan 1 6 1 1 1 1963 1963
Newton 1 2 1 1 1 1958 1958
Oregon 2 2 3 2 2 1956 2006
Osage 2 2 4 2 2 1982 1999
Ozark 5 10 8 7 8 1892 2017
Phelps 3 15 7 5 8 1945 1982
Pulaski 4 14 4 3 4 1959 1976
Reynolds 1 2 2 1 2 1963 1963
Saint Clair 11 76 16 15 16 1938 2007
Saint Louis 6 10 5 6 6 1892 1965
Shannon 4 6 5 4 4 1950 2002
Stone 8 13 10 8 8 1892 2012
Taney 16 23 13 19 19 1946 2007
Texas 1 1 1 1 1 1976 1976
Vernon 1 1 1 1 1
Warren 1 1 2 1 1 2010 2010
Washington 1 1 1 1 1 1965 1965
Wayne 2 3 4 3 3 1940 1964
Wright 1 1 1 1 1 1961 1961

Potential County Records

Potential counties for Tantilla gracilis (Flat-headed Snake). 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 Bates Same Level IV ecoregion, within 5 miles Cherokee Plains
2 Callaway Same Level IV ecoregion, within 5 miles River Hills
2 Cedar Same Level IV ecoregion, within 5 miles Springfield Plateau
2 Cole Same Level IV ecoregion, within 5 miles Osage/Gasconade Hills
2 Douglas Same Level IV ecoregion, within 5 miles White River Hills
2 Howell Same Level IV ecoregion, within 5 miles White River Hills
2 Lawrence Same Level IV ecoregion, within 5 miles Springfield Plateau
2 Polk Same Level IV ecoregion, within 5 miles Osage/Gasconade Hills
2 Saint Charles Same Level IV ecoregion, within 5 miles River Hills
2 Sainte Genevieve Same Level IV ecoregion, within 5 miles Eastern Ozark Border
2 Sainte Genevieve Same Level IV ecoregion, within 5 miles River Hills
2 Saint Francois Same Level IV ecoregion, within 5 miles St. Francois Knobs and Basins
2 Saint Francois Same Level IV ecoregion, within 5 miles Eastern Ozark Border
2 Saint Francois Same Level IV ecoregion, within 5 miles Meramec River Hills
3 Clay Same Level III ecoregion, within 5 miles Western Corn Belt Plains
3 Platte Same Level III ecoregion, within 5 miles Western Corn Belt Plains
4 Webster Same Level IV ecoregion, within 10 miles Central Plateau
6 Audrain Same Level IV ecoregion, within 20 miles River Hills
6 Barton Same Level IV ecoregion, within 20 miles Springfield Plateau
6 Bollinger Same Level IV ecoregion, within 20 miles St. Francois Knobs and Basins
6 Lincoln Same Level IV ecoregion, within 20 miles River Hills
6 Pettis Same Level IV ecoregion, within 20 miles Cherokee Plains
6 Pike Same Level IV ecoregion, within 20 miles River Hills
6 Ripley Same Level IV ecoregion, within 20 miles Current River Hills
6 Ripley Same Level IV ecoregion, within 20 miles Central Plateau
7 Johnson Same Level III ecoregion, within 20 miles Central Irregular Plains
7 Perry Same Level III ecoregion, within 20 miles Ozark Highlands
8 Boone Same Level IV ecoregion, within 30 miles River Hills
8 Butler Same Level IV ecoregion, within 30 miles Current River Hills
8 Lafayette Same Level IV ecoregion, within 30 miles Rolling Loess Prairies
8 Ray Same Level IV ecoregion, within 30 miles Rolling Loess Prairies
9 Buchanan Same Level III ecoregion, within 30 miles Western Corn Belt Plains
9 Cape Girardeau Same Level III ecoregion, within 30 miles Ozark Highlands
9 Cass Same Level III ecoregion, within 30 miles Central Irregular Plains
9 Clinton Same Level III ecoregion, within 30 miles Western Corn Belt Plains
9 Stoddard Same Level III ecoregion, within 30 miles Ozark Highlands
10 Cooper Same Level IV ecoregion, adjacent county River Hills
10 Cooper Same Level IV ecoregion, adjacent county Rolling Loess Prairies

Linnaean Classification

Kingdom:
Animalia - Animals
Phylum:
Chordata - Chordates
Subphylum:
Vertebrata - Vertebrates
Class:
Reptilia Laurenti, 1768 - Reptiles
Order:
Squamata Oppel, 1811 - Lizards and Snakes
Suborder:
Serpentes Linnaeus, 1758 - Snakes
Family:
Colubridae Oppel, 1811 - Typical Harmless Snakes
Genus:
Tantilla Baird and Girard, 1853 - Black-headed, Crowned, and Flat-headed Snakes
Species:
Tantilla gracilis Baird and Girard, 1853 - Flat-headed Snake

Recent Taxonomic Synonyms

(none)