|Scientific Name:||Ammocrypta vivax Hay, 1882|
|Taxonomic Notes:||In a phylogenetic analysis based on morphology, Simons (1991) concluded that Ammocrypta asprella should be included in the genus Crystallaria (generally has been regarded as a subgenus of Ammocrypta) and that the genus Ammocrypta should be regarded as a subgenus of Etheostoma. Page and Burr (1991), Simons (1992), and Wiley (1992) adopted this change, but Etnier and Starnes (1993) and Jenkins and Burkhead (1994) retained Ammocrypta as a distinct genus and treated Crystallaria as a subgenus. Patterns of molecular variation are consistent with the recognition of Ammocrypta species as taxonomically distinct from Etheostoma (Wood and Mayden 1997, Faber and Stepien 1998, Near et al. 2000).|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer(s):||Smith, K. & Darwall, W.R.T.|
|Facilitator/Compiler(s):||Hammerson, G.A. & Ormes, M.|
Listed as Least Concern in view of the relatively large range extent, large population size, large number of subpopulations, and (despite historical extirpations in the northern part of the range) apparently stable trend.
|Range Description:||Range is centered in the central portion of the Mississippi embayment; primarily this species occurs in the Coastal Plain except along major rivers where it extends beyond the Coastal Plain, including the Mississippi River basin from southern Mississippi north to western Kentucky and southeastern Missouri, west to eastern Oklahoma and Texas; Gulf drainages from the Pascagoula River, Mississippi, to the San Jacinto River, Texas (Pflieger 1997, Ross 2001, Miller and Robison 2004, Page and Burr 2011).|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is represented by a large number of occurrences (subpopulations).|
Total adult population size is unknown but presumably exceeds 10,000. This species is regarded as locally common (Page and Burr 2011). This species sometimes has been collected in large numbers in some localities in Arkansas (Robison and Buchanan 1988).
This darter appears to have declined in the northern part of its range; it apparently has been extirpated from the St. Francis and Arkansas river drainages in Arkansas (Robison and Buchanan 1988); it has declined in abundance in recent decades in Missouri (Pflieger 1997); it is extirpated from the single known locality in Kentucky (Burr and Warren 1986). Southward, populations appear to be secure.
Trend over the past 10 years or three generations is uncertain but probably relatively stable.
|Current Population Trend:||Stable|
|Habitat and Ecology:||This sand darter inhabits creeks and small to medium rivers; most often in moderate current over sandy (sometimes fine gravel) substrate (Lee et al. 1980, Robison and Buchanan 1988, Pflieger 1997, Ross 2001, Boschung and Mayden 2004, Page and Burr 2011). In Missouri and Arkansas it has been collected in sloughs and drainage ditches where silt, gravel, and hard clay bottoms predominate.|
|Movement patterns:||Not a Migrant|
|Major Threat(s):||No major threats are known. Populations in Mississippi are apparently secure (Ross 2001).|
|Conservation Actions:||Currently, this species is of relatively low conservation concern and does not require significant additional protection or major management, monitoring, or research actions.|
|Citation:||NatureServe. 2013. Ammocrypta vivax. The IUCN Red List of Threatened Species 2013: e.T202430A2744777.Downloaded on 18 November 2017.|
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